diff --git a/CHANGELOG.md b/CHANGELOG.md
index c46d4e2d..d98af95b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,8 +2,9 @@ Latest
 ------
 
 ## Changes
+* [#91](https://github.com/cleverage/process-bundle/issues/91) Reference a task by a code in the process configurations: new `task` key (`task: transformer`), next to its `options`. The code of a task service is declared with the new `code` attribute of the `cleverage.task` tag or the new `#[AsTask(code: '...')]` attribute (autoconfiguration); every task of the bundle has a code, given on its reference page (snake case of its class name without `Task`, e.g. `transformer`, `constant_output`, `csv_reader`). The codes are resolved when the container is compiled (`TaskLocatorCompilerPass`): an unknown or duplicate code fails the compilation. Referencing a task by its `service` (e.g. `service: '@CleverAge\ProcessBundle\Task\TransformerTask'`) is deprecated (configuration deprecation), it will be removed in v6.0: use `task: <code>`. The documentation examples use the codes. Update documentation, add tests.
 * [#276](https://github.com/cleverage/process-bundle/issues/276) TransformerRegistry: the transformers are loaded lazily from a service locator indexed by code (new internal `TransformerLocatorCompilerPass`, new optional `TransformerRegistry` constructor argument): a transformer is only instantiated when a process uses it. The code is given by the new `code` attribute of the `cleverage.transformer` tag, or by the new `#[AsTransformer(code: '...')]` attribute (autoconfiguration); it must be the one returned by `getCode()`. All the bundle transformers and the generic transformers have their code. Duplicate codes fail the container compilation. A transformer tagged without `code` is still registered eagerly, with `TransformerRegistry::addTransformer()`, which is deprecated (the `code` will be required in v6.0, #280). `RegistryCompilerPass` is no longer used and deprecated. `TransformerInterface::getCode()` is deprecated (`@deprecated` PHPDoc: no runtime notice is possible for an interface method), it will be removed from the interface in v6.0 (#280): keep implementing it, returning the code of the tag until then. Update documentation, add tests.
-* [#149](https://github.com/cleverage/process-bundle/issues/149) Apply Symfony best practices to the tasks and transformers services: they are defined explicitly (no more autowiring, autoconfiguration nor bindings in the bundle), with `cleverage_process.task.*` / `cleverage_process.transformer.*` ids (private) and a public alias named after their class, so the `service: '@CleverAge\ProcessBundle\Task\...'` references, the autowiring of the transformers by class and `$container->get(<class>)` keep working. Same arguments, tags and `shared` settings as before (generated from the previously autowired definitions). Update documentation.
+* [#149](https://github.com/cleverage/process-bundle/issues/149) Apply Symfony best practices to the tasks and transformers services: they are defined explicitly (no more autowiring, autoconfiguration nor bindings in the bundle), keeping their class name as service id. Same arguments, tags and `shared` settings as before (generated from the previously autowired definitions). They stay public, but fetching them directly from the service container (`$container->get(<class>)`) is deprecated (`container.private` tag): they will be private in v6.0, use dependency injection (autowiring by class and decoration keep working). Update documentation.
 * [#275](https://github.com/cleverage/process-bundle/issues/275) The tasks are fetched from a service locator built at compile time from the services referenced by the process configurations (new `TaskRegistry`, `cleverage_process.registry.task`, and internal `TaskLocatorCompilerPass`) instead of the whole service container: a task service can be private. `ProcessManager` and `ProcessHelpCommand` get the registry as a new optional last constructor argument; not passing it is deprecated (the tasks are then fetched from the container), and fetching a task service not referenced by the process configurations known at compile time falls back on the container with a deprecation. Both fallbacks will be removed in v6.0 (#114). Update documentation, add tests.
 * [#278](https://github.com/cleverage/process-bundle/issues/278) The container no longer fails to compile when the Symfony serializer or validator is not enabled: the tasks and transformers depending on them (`NormalizerTask`, `DenormalizerTask`, `SerializerTask`, `DeserializerTask`, `normalize` and `denormalize` transformers, `ValidatorTask`) are replaced by services failing with an explicit message when they are used (new internal `UnavailableServicesCompilerPass`). `CheckSerializerCompilerPass` is no longer used and deprecated. Update documentation, add tests.
 * [#272](https://github.com/cleverage/process-bundle/issues/272) DependencyInjection: autoconfiguration of the services implementing `TaskInterface` (`public`, not shared, `monolog.logger` tag on `cleverage_process_task`) and `TransformerInterface` (`cleverage.transformer` tag, `monolog.logger` tag on `cleverage_process_transformer`): the `_instanceof` rules or explicit tags are no longer needed with `autoconfigure: true`; a setting explicitly defined on a service wins. Add FQCN aliases to autowire `ProcessManager`, `ProcessConfigurationRegistry`, `TransformerRegistry` and `ContextualOptionResolver`. Update documentation, add tests.
diff --git a/config/services/task.yaml b/config/services/task.yaml
index 38b3ce38..d6df2447 100644
--- a/config/services/task.yaml
+++ b/config/services/task.yaml
@@ -1,478 +1,365 @@
 services:
     _defaults:
-        public: false
+        # Public for the deprecated direct access from the service container (fallback of TaskRegistry, service: of the
+        # task configurations), private in v6.0
+        public: true
         tags:
             - { name: monolog.logger, channel: cleverage_process_task }
+            - { name: container.private, package: cleverage/process-bundle, version: '5.4' }
 
-    cleverage_process.task.aggregate_iterable:
-        class: CleverAge\ProcessBundle\Task\AggregateIterableTask
-        shared: false
     CleverAge\ProcessBundle\Task\AggregateIterableTask:
-        alias: cleverage_process.task.aggregate_iterable
-        public: true
-
-    cleverage_process.task.array_merge:
-        class: CleverAge\ProcessBundle\Task\ArrayMergeTask
+        tags:
+            - { name: cleverage.task, code: aggregate_iterable }
         shared: false
+
     CleverAge\ProcessBundle\Task\ArrayMergeTask:
-        alias: cleverage_process.task.array_merge
-        public: true
+        tags:
+            - { name: cleverage.task, code: array_merge }
+        shared: false
 
-    cleverage_process.task.column_aggregator:
-        class: CleverAge\ProcessBundle\Task\ColumnAggregatorTask
+    CleverAge\ProcessBundle\Task\ColumnAggregatorTask:
+        tags:
+            - { name: cleverage.task, code: column_aggregator }
         shared: false
         arguments:
             - '@property_accessor'
             - '@logger'
-    CleverAge\ProcessBundle\Task\ColumnAggregatorTask:
-        alias: cleverage_process.task.column_aggregator
-        public: true
 
-    cleverage_process.task.constant_iterable_output:
-        class: CleverAge\ProcessBundle\Task\ConstantIterableOutputTask
-        shared: false
     CleverAge\ProcessBundle\Task\ConstantIterableOutputTask:
-        alias: cleverage_process.task.constant_iterable_output
-        public: true
-
-    cleverage_process.task.constant_output:
-        class: CleverAge\ProcessBundle\Task\ConstantOutputTask
+        tags:
+            - { name: cleverage.task, code: constant_iterable_output }
         shared: false
-    CleverAge\ProcessBundle\Task\ConstantOutputTask:
-        alias: cleverage_process.task.constant_output
-        public: true
 
-    cleverage_process.task.counter:
-        class: CleverAge\ProcessBundle\Task\CounterTask
+    CleverAge\ProcessBundle\Task\ConstantOutputTask:
+        tags:
+            - { name: cleverage.task, code: constant_output }
         shared: false
-    CleverAge\ProcessBundle\Task\CounterTask:
-        alias: cleverage_process.task.counter
-        public: true
 
-    cleverage_process.task.debug:
-        class: CleverAge\ProcessBundle\Task\Debug\DebugTask
+    CleverAge\ProcessBundle\Task\CounterTask:
+        tags:
+            - { name: cleverage.task, code: counter }
         shared: false
-    CleverAge\ProcessBundle\Task\Debug\DebugTask:
-        alias: cleverage_process.task.debug
-        public: true
 
-    cleverage_process.task.die:
-        class: CleverAge\ProcessBundle\Task\Debug\DieTask
+    CleverAge\ProcessBundle\Task\Debug\DebugTask:
+        tags:
+            - { name: cleverage.task, code: debug }
         shared: false
-    CleverAge\ProcessBundle\Task\Debug\DieTask:
-        alias: cleverage_process.task.die
-        public: true
 
-    cleverage_process.task.error_forwarder:
-        class: CleverAge\ProcessBundle\Task\Debug\ErrorForwarderTask
+    CleverAge\ProcessBundle\Task\Debug\DieTask:
+        tags:
+            - { name: cleverage.task, code: die }
         shared: false
+
     CleverAge\ProcessBundle\Task\Debug\ErrorForwarderTask:
-        alias: cleverage_process.task.error_forwarder
-        public: true
+        tags:
+            - { name: cleverage.task, code: error_forwarder }
+        shared: false
 
-    cleverage_process.task.stopwatch:
-        class: CleverAge\ProcessBundle\Task\Debug\StopwatchTask
+    CleverAge\ProcessBundle\Task\Debug\StopwatchTask:
+        tags:
+            - { name: cleverage.task, code: stopwatch }
         shared: false
         arguments:
             - '@logger'
             - '@debug.stopwatch'
-    CleverAge\ProcessBundle\Task\Debug\StopwatchTask:
-        alias: cleverage_process.task.stopwatch
-        public: true
 
-    cleverage_process.task.dummy:
-        class: CleverAge\ProcessBundle\Task\DummyTask
-        shared: false
     CleverAge\ProcessBundle\Task\DummyTask:
-        alias: cleverage_process.task.dummy
-        public: true
+        tags:
+            - { name: cleverage.task, code: dummy }
+        shared: false
 
-    cleverage_process.task.event_dispatcher:
-        class: CleverAge\ProcessBundle\Task\Event\EventDispatcherTask
+    CleverAge\ProcessBundle\Task\Event\EventDispatcherTask:
+        tags:
+            - { name: cleverage.task, code: event_dispatcher }
         shared: false
         arguments:
             - '@event_dispatcher'
-    CleverAge\ProcessBundle\Task\Event\EventDispatcherTask:
-        alias: cleverage_process.task.event_dispatcher
-        public: true
 
-    cleverage_process.task.csv_reader:
-        class: CleverAge\ProcessBundle\Task\File\Csv\CsvReaderTask
+    CleverAge\ProcessBundle\Task\File\Csv\CsvReaderTask:
+        tags:
+            - { name: cleverage.task, code: csv_reader }
         shared: false
         arguments:
             - '@logger'
-    CleverAge\ProcessBundle\Task\File\Csv\CsvReaderTask:
-        alias: cleverage_process.task.csv_reader
-        public: true
 
-    cleverage_process.task.csv_splitter:
-        class: CleverAge\ProcessBundle\Task\File\Csv\CsvSplitterTask
+    CleverAge\ProcessBundle\Task\File\Csv\CsvSplitterTask:
+        tags:
+            - { name: cleverage.task, code: csv_splitter }
         shared: false
         arguments:
             - '@logger'
-    CleverAge\ProcessBundle\Task\File\Csv\CsvSplitterTask:
-        alias: cleverage_process.task.csv_splitter
-        public: true
 
-    cleverage_process.task.csv_writer:
-        class: CleverAge\ProcessBundle\Task\File\Csv\CsvWriterTask
-        shared: false
     CleverAge\ProcessBundle\Task\File\Csv\CsvWriterTask:
-        alias: cleverage_process.task.csv_writer
-        public: true
+        tags:
+            - { name: cleverage.task, code: csv_writer }
+        shared: false
 
-    cleverage_process.task.input_csv_reader:
-        class: CleverAge\ProcessBundle\Task\File\Csv\InputCsvReaderTask
+    CleverAge\ProcessBundle\Task\File\Csv\InputCsvReaderTask:
+        tags:
+            - { name: cleverage.task, code: input_csv_reader }
         shared: false
         arguments:
             - '@logger'
-    CleverAge\ProcessBundle\Task\File\Csv\InputCsvReaderTask:
-        alias: cleverage_process.task.input_csv_reader
-        public: true
 
-    cleverage_process.task.file_mover:
-        class: CleverAge\ProcessBundle\Task\File\FileMoverTask
-        shared: false
     CleverAge\ProcessBundle\Task\File\FileMoverTask:
-        alias: cleverage_process.task.file_mover
-        public: true
-
-    cleverage_process.task.file_reader:
-        class: CleverAge\ProcessBundle\Task\File\FileReaderTask
+        tags:
+            - { name: cleverage.task, code: file_mover }
         shared: false
-    CleverAge\ProcessBundle\Task\File\FileReaderTask:
-        alias: cleverage_process.task.file_reader
-        public: true
 
-    cleverage_process.task.file_remover:
-        class: CleverAge\ProcessBundle\Task\File\FileRemoverTask
+    CleverAge\ProcessBundle\Task\File\FileReaderTask:
+        tags:
+            - { name: cleverage.task, code: file_reader }
         shared: false
-    CleverAge\ProcessBundle\Task\File\FileRemoverTask:
-        alias: cleverage_process.task.file_remover
-        public: true
 
-    cleverage_process.task.file_splitter:
-        class: CleverAge\ProcessBundle\Task\File\FileSplitterTask
+    CleverAge\ProcessBundle\Task\File\FileRemoverTask:
+        tags:
+            - { name: cleverage.task, code: file_remover }
         shared: false
-    CleverAge\ProcessBundle\Task\File\FileSplitterTask:
-        alias: cleverage_process.task.file_splitter
-        public: true
 
-    cleverage_process.task.file_writer:
-        class: CleverAge\ProcessBundle\Task\File\FileWriterTask
+    CleverAge\ProcessBundle\Task\File\FileSplitterTask:
+        tags:
+            - { name: cleverage.task, code: file_splitter }
         shared: false
+
     CleverAge\ProcessBundle\Task\File\FileWriterTask:
-        alias: cleverage_process.task.file_writer
-        public: true
+        tags:
+            - { name: cleverage.task, code: file_writer }
+        shared: false
 
-    cleverage_process.task.folder_browser:
-        class: CleverAge\ProcessBundle\Task\File\FolderBrowserTask
+    CleverAge\ProcessBundle\Task\File\FolderBrowserTask:
+        tags:
+            - { name: cleverage.task, code: folder_browser }
         shared: false
         arguments:
             - '@logger'
-    CleverAge\ProcessBundle\Task\File\FolderBrowserTask:
-        alias: cleverage_process.task.folder_browser
-        public: true
 
-    cleverage_process.task.input_file_reader:
-        class: CleverAge\ProcessBundle\Task\File\InputFileReaderTask
-        shared: false
     CleverAge\ProcessBundle\Task\File\InputFileReaderTask:
-        alias: cleverage_process.task.input_file_reader
-        public: true
+        tags:
+            - { name: cleverage.task, code: input_file_reader }
+        shared: false
 
-    cleverage_process.task.input_folder_browser:
-        class: CleverAge\ProcessBundle\Task\File\InputFolderBrowserTask
+    CleverAge\ProcessBundle\Task\File\InputFolderBrowserTask:
+        tags:
+            - { name: cleverage.task, code: input_folder_browser }
         shared: false
         arguments:
             - '@logger'
-    CleverAge\ProcessBundle\Task\File\InputFolderBrowserTask:
-        alias: cleverage_process.task.input_folder_browser
-        public: true
 
-    cleverage_process.task.input_line_reader:
-        class: CleverAge\ProcessBundle\Task\File\InputLineReaderTask
-        shared: false
     CleverAge\ProcessBundle\Task\File\InputLineReaderTask:
-        alias: cleverage_process.task.input_line_reader
-        public: true
-
-    cleverage_process.task.json_stream_reader:
-        class: CleverAge\ProcessBundle\Task\File\JsonStream\JsonStreamReaderTask
+        tags:
+            - { name: cleverage.task, code: input_line_reader }
         shared: false
-    CleverAge\ProcessBundle\Task\File\JsonStream\JsonStreamReaderTask:
-        alias: cleverage_process.task.json_stream_reader
-        public: true
 
-    cleverage_process.task.json_stream_writer:
-        class: CleverAge\ProcessBundle\Task\File\JsonStream\JsonStreamWriterTask
+    CleverAge\ProcessBundle\Task\File\JsonStream\JsonStreamReaderTask:
+        tags:
+            - { name: cleverage.task, code: json_stream_reader }
         shared: false
-    CleverAge\ProcessBundle\Task\File\JsonStream\JsonStreamWriterTask:
-        alias: cleverage_process.task.json_stream_writer
-        public: true
 
-    cleverage_process.task.line_reader:
-        class: CleverAge\ProcessBundle\Task\File\LineReaderTask
+    CleverAge\ProcessBundle\Task\File\JsonStream\JsonStreamWriterTask:
+        tags:
+            - { name: cleverage.task, code: json_stream_writer }
         shared: false
+
     CleverAge\ProcessBundle\Task\File\LineReaderTask:
-        alias: cleverage_process.task.line_reader
-        public: true
+        tags:
+            - { name: cleverage.task, code: line_reader }
+        shared: false
 
-    cleverage_process.task.xml_reader:
-        class: CleverAge\ProcessBundle\Task\File\Xml\XmlReaderTask
+    CleverAge\ProcessBundle\Task\File\Xml\XmlReaderTask:
+        tags:
+            - { name: cleverage.task, code: xml_reader }
         shared: false
         arguments:
             - '@logger'
-    CleverAge\ProcessBundle\Task\File\Xml\XmlReaderTask:
-        alias: cleverage_process.task.xml_reader
-        public: true
 
-    cleverage_process.task.xml_stream_reader:
-        class: CleverAge\ProcessBundle\Task\File\Xml\XmlStreamReaderTask
-        shared: false
     CleverAge\ProcessBundle\Task\File\Xml\XmlStreamReaderTask:
-        alias: cleverage_process.task.xml_stream_reader
-        public: true
+        tags:
+            - { name: cleverage.task, code: xml_stream_reader }
+        shared: false
 
-    cleverage_process.task.xml_writer:
-        class: CleverAge\ProcessBundle\Task\File\Xml\XmlWriterTask
+    CleverAge\ProcessBundle\Task\File\Xml\XmlWriterTask:
+        tags:
+            - { name: cleverage.task, code: xml_writer }
         shared: false
         arguments:
             - '@logger'
-    CleverAge\ProcessBundle\Task\File\Xml\XmlWriterTask:
-        alias: cleverage_process.task.xml_writer
-        public: true
 
-    cleverage_process.task.yaml_reader:
-        class: CleverAge\ProcessBundle\Task\File\Yaml\YamlReaderTask
-        shared: false
     CleverAge\ProcessBundle\Task\File\Yaml\YamlReaderTask:
-        alias: cleverage_process.task.yaml_reader
-        public: true
-
-    cleverage_process.task.yaml_writer:
-        class: CleverAge\ProcessBundle\Task\File\Yaml\YamlWriterTask
+        tags:
+            - { name: cleverage.task, code: yaml_reader }
         shared: false
-    CleverAge\ProcessBundle\Task\File\Yaml\YamlWriterTask:
-        alias: cleverage_process.task.yaml_writer
-        public: true
 
-    cleverage_process.task.filter:
-        class: CleverAge\ProcessBundle\Task\FilterTask
+    CleverAge\ProcessBundle\Task\File\Yaml\YamlWriterTask:
+        tags:
+            - { name: cleverage.task, code: yaml_writer }
         shared: false
+
     CleverAge\ProcessBundle\Task\FilterTask:
-        alias: cleverage_process.task.filter
-        public: true
+        tags:
+            - { name: cleverage.task, code: filter }
+        shared: false
 
-    cleverage_process.task.group_by_aggregate_iterable:
-        class: CleverAge\ProcessBundle\Task\GroupByAggregateIterableTask
+    CleverAge\ProcessBundle\Task\GroupByAggregateIterableTask:
+        tags:
+            - { name: cleverage.task, code: group_by_aggregate_iterable }
         shared: false
         arguments:
             - '@property_accessor'
-    CleverAge\ProcessBundle\Task\GroupByAggregateIterableTask:
-        alias: cleverage_process.task.group_by_aggregate_iterable
-        public: true
 
-    cleverage_process.task.input_aggregator:
-        class: CleverAge\ProcessBundle\Task\InputAggregatorTask
-        shared: false
     CleverAge\ProcessBundle\Task\InputAggregatorTask:
-        alias: cleverage_process.task.input_aggregator
-        public: true
-
-    cleverage_process.task.input_iterator:
-        class: CleverAge\ProcessBundle\Task\InputIteratorTask
+        tags:
+            - { name: cleverage.task, code: input_aggregator }
         shared: false
+
     CleverAge\ProcessBundle\Task\InputIteratorTask:
-        alias: cleverage_process.task.input_iterator
-        public: true
+        tags:
+            - { name: cleverage.task, code: input_iterator }
+        shared: false
 
-    cleverage_process.task.iterable_batch:
-        class: CleverAge\ProcessBundle\Task\IterableBatchTask
+    CleverAge\ProcessBundle\Task\IterableBatchTask:
+        tags:
+            - { name: cleverage.task, code: iterable_batch }
         shared: false
         arguments:
             - '@logger'
-    CleverAge\ProcessBundle\Task\IterableBatchTask:
-        alias: cleverage_process.task.iterable_batch
-        public: true
 
-    cleverage_process.task.object_updater:
-        class: CleverAge\ProcessBundle\Task\ObjectUpdaterTask
+    CleverAge\ProcessBundle\Task\ObjectUpdaterTask:
+        tags:
+            - { name: cleverage.task, code: object_updater }
         shared: false
         arguments:
             - '@property_accessor'
-    CleverAge\ProcessBundle\Task\ObjectUpdaterTask:
-        alias: cleverage_process.task.object_updater
-        public: true
 
-    cleverage_process.task.command_runner:
-        class: CleverAge\ProcessBundle\Task\Process\CommandRunnerTask
+    CleverAge\ProcessBundle\Task\Process\CommandRunnerTask:
+        tags:
+            - { name: cleverage.task, code: command_runner }
         shared: false
         arguments:
             - '@kernel'
-    CleverAge\ProcessBundle\Task\Process\CommandRunnerTask:
-        alias: cleverage_process.task.command_runner
-        public: true
 
-    cleverage_process.task.process_executor:
-        class: CleverAge\ProcessBundle\Task\Process\ProcessExecutorTask
+    CleverAge\ProcessBundle\Task\Process\ProcessExecutorTask:
+        tags:
+            - { name: cleverage.task, code: process_executor }
         shared: false
         arguments:
             - '@cleverage_process.manager.process'
             - '@cleverage_process.registry.process_configuration'
             - '@logger'
-    CleverAge\ProcessBundle\Task\Process\ProcessExecutorTask:
-        alias: cleverage_process.task.process_executor
-        public: true
 
-    cleverage_process.task.process_launcher:
-        class: CleverAge\ProcessBundle\Task\Process\ProcessLauncherTask
+    CleverAge\ProcessBundle\Task\Process\ProcessLauncherTask:
+        tags:
+            - { name: cleverage.task, code: process_launcher }
         shared: false
         arguments:
             - '@logger'
             - '@cleverage_process.registry.process_configuration'
             - '@kernel'
-    CleverAge\ProcessBundle\Task\Process\ProcessLauncherTask:
-        alias: cleverage_process.task.process_launcher
-        public: true
 
-    cleverage_process.task.property_getter:
-        class: CleverAge\ProcessBundle\Task\PropertyGetterTask
+    CleverAge\ProcessBundle\Task\PropertyGetterTask:
+        tags:
+            - { name: cleverage.task, code: property_getter }
         shared: false
         arguments:
             - '@logger'
             - '@property_accessor'
-    CleverAge\ProcessBundle\Task\PropertyGetterTask:
-        alias: cleverage_process.task.property_getter
-        public: true
 
-    cleverage_process.task.property_setter:
-        class: CleverAge\ProcessBundle\Task\PropertySetterTask
+    CleverAge\ProcessBundle\Task\PropertySetterTask:
+        tags:
+            - { name: cleverage.task, code: property_setter }
         shared: false
         arguments:
             - '@logger'
             - '@property_accessor'
-    CleverAge\ProcessBundle\Task\PropertySetterTask:
-        alias: cleverage_process.task.property_setter
-        public: true
 
-    cleverage_process.task.advanced_stat_counter:
-        class: CleverAge\ProcessBundle\Task\Reporting\AdvancedStatCounterTask
+    CleverAge\ProcessBundle\Task\Reporting\AdvancedStatCounterTask:
+        tags:
+            - { name: cleverage.task, code: advanced_stat_counter }
         shared: false
         arguments:
             - '@logger'
-    CleverAge\ProcessBundle\Task\Reporting\AdvancedStatCounterTask:
-        alias: cleverage_process.task.advanced_stat_counter
-        public: true
 
-    cleverage_process.task.logger:
-        class: CleverAge\ProcessBundle\Task\Reporting\LoggerTask
+    CleverAge\ProcessBundle\Task\Reporting\LoggerTask:
+        tags:
+            - { name: cleverage.task, code: logger }
         shared: false
         arguments:
             - '@logger'
             - '@property_accessor'
-    CleverAge\ProcessBundle\Task\Reporting\LoggerTask:
-        alias: cleverage_process.task.logger
-        public: true
 
-    cleverage_process.task.stat_counter:
-        class: CleverAge\ProcessBundle\Task\Reporting\StatCounterTask
+    CleverAge\ProcessBundle\Task\Reporting\StatCounterTask:
+        tags:
+            - { name: cleverage.task, code: stat_counter }
         shared: false
         arguments:
             - '@logger'
-    CleverAge\ProcessBundle\Task\Reporting\StatCounterTask:
-        alias: cleverage_process.task.stat_counter
-        public: true
 
-    cleverage_process.task.row_aggregator:
-        class: CleverAge\ProcessBundle\Task\RowAggregatorTask
+    CleverAge\ProcessBundle\Task\RowAggregatorTask:
+        tags:
+            - { name: cleverage.task, code: row_aggregator }
         shared: false
         arguments:
             - '@logger'
-    CleverAge\ProcessBundle\Task\RowAggregatorTask:
-        alias: cleverage_process.task.row_aggregator
-        public: true
 
-    cleverage_process.task.denormalizer:
-        class: CleverAge\ProcessBundle\Task\Serialization\DenormalizerTask
+    CleverAge\ProcessBundle\Task\Serialization\DenormalizerTask:
+        tags:
+            - { name: cleverage.task, code: denormalizer }
         shared: false
         arguments:
             - '@serializer'
-    CleverAge\ProcessBundle\Task\Serialization\DenormalizerTask:
-        alias: cleverage_process.task.denormalizer
-        public: true
 
-    cleverage_process.task.deserializer:
-        class: CleverAge\ProcessBundle\Task\Serialization\DeserializerTask
+    CleverAge\ProcessBundle\Task\Serialization\DeserializerTask:
+        tags:
+            - { name: cleverage.task, code: deserializer }
         shared: false
         arguments:
             - '@serializer'
-    CleverAge\ProcessBundle\Task\Serialization\DeserializerTask:
-        alias: cleverage_process.task.deserializer
-        public: true
 
-    cleverage_process.task.normalizer:
-        class: CleverAge\ProcessBundle\Task\Serialization\NormalizerTask
+    CleverAge\ProcessBundle\Task\Serialization\NormalizerTask:
+        tags:
+            - { name: cleverage.task, code: normalizer }
         shared: false
         arguments:
             - '@serializer'
-    CleverAge\ProcessBundle\Task\Serialization\NormalizerTask:
-        alias: cleverage_process.task.normalizer
-        public: true
 
-    cleverage_process.task.serializer:
-        class: CleverAge\ProcessBundle\Task\Serialization\SerializerTask
+    CleverAge\ProcessBundle\Task\Serialization\SerializerTask:
+        tags:
+            - { name: cleverage.task, code: serializer }
         shared: false
         arguments:
             - '@serializer'
-    CleverAge\ProcessBundle\Task\Serialization\SerializerTask:
-        alias: cleverage_process.task.serializer
-        public: true
 
-    cleverage_process.task.simple_batch:
-        class: CleverAge\ProcessBundle\Task\SimpleBatchTask
-        shared: false
     CleverAge\ProcessBundle\Task\SimpleBatchTask:
-        alias: cleverage_process.task.simple_batch
-        public: true
-
-    cleverage_process.task.skip_empty:
-        class: CleverAge\ProcessBundle\Task\SkipEmptyTask
+        tags:
+            - { name: cleverage.task, code: simple_batch }
         shared: false
-    CleverAge\ProcessBundle\Task\SkipEmptyTask:
-        alias: cleverage_process.task.skip_empty
-        public: true
 
-    cleverage_process.task.split_join_line:
-        class: CleverAge\ProcessBundle\Task\SplitJoinLineTask
+    CleverAge\ProcessBundle\Task\SkipEmptyTask:
+        tags:
+            - { name: cleverage.task, code: skip_empty }
         shared: false
-    CleverAge\ProcessBundle\Task\SplitJoinLineTask:
-        alias: cleverage_process.task.split_join_line
-        public: true
 
-    cleverage_process.task.stop:
-        class: CleverAge\ProcessBundle\Task\StopTask
+    CleverAge\ProcessBundle\Task\SplitJoinLineTask:
+        tags:
+            - { name: cleverage.task, code: split_join_line }
         shared: false
+
     CleverAge\ProcessBundle\Task\StopTask:
-        alias: cleverage_process.task.stop
-        public: true
+        tags:
+            - { name: cleverage.task, code: stop }
+        shared: false
 
-    cleverage_process.task.transformer:
-        class: CleverAge\ProcessBundle\Task\TransformerTask
+    CleverAge\ProcessBundle\Task\TransformerTask:
+        tags:
+            - { name: cleverage.task, code: transformer }
         shared: false
         arguments:
             - '@logger'
             - '@cleverage_process.registry.transformer'
-    CleverAge\ProcessBundle\Task\TransformerTask:
-        alias: cleverage_process.task.transformer
-        public: true
 
-    cleverage_process.task.validator:
-        class: CleverAge\ProcessBundle\Task\Validation\ValidatorTask
+    CleverAge\ProcessBundle\Task\Validation\ValidatorTask:
+        tags:
+            - { name: cleverage.task, code: validator }
         shared: false
         arguments:
             - '@logger'
             - '@validator'
-    CleverAge\ProcessBundle\Task\Validation\ValidatorTask:
-        alias: cleverage_process.task.validator
-        public: true
diff --git a/config/services/transformer.yaml b/config/services/transformer.yaml
index f94e7148..e30e22b4 100644
--- a/config/services/transformer.yaml
+++ b/config/services/transformer.yaml
@@ -1,328 +1,182 @@
 services:
     _defaults:
-        public: false
+        # Public for the direct access from the service container (deprecated), private in v6.0
+        public: true
         tags:
             - { name: monolog.logger, channel: cleverage_process_transformer }
+            - { name: container.private, package: cleverage/process-bundle, version: '5.4' }
 
-    cleverage_process.transformer.array_element:
-        class: CleverAge\ProcessBundle\Transformer\Array\ArrayElementTransformer
+    CleverAge\ProcessBundle\Transformer\Array\ArrayElementTransformer:
         tags:
             - { name: cleverage.transformer, code: array_element }
-    CleverAge\ProcessBundle\Transformer\Array\ArrayElementTransformer:
-        alias: cleverage_process.transformer.array_element
-        public: true
 
-    cleverage_process.transformer.array_filter:
-        class: CleverAge\ProcessBundle\Transformer\Array\ArrayFilterTransformer
+    CleverAge\ProcessBundle\Transformer\Array\ArrayFilterTransformer:
         tags:
             - { name: cleverage.transformer, code: array_filter }
         arguments:
             - '@property_accessor'
-    CleverAge\ProcessBundle\Transformer\Array\ArrayFilterTransformer:
-        alias: cleverage_process.transformer.array_filter
-        public: true
 
-    cleverage_process.transformer.array_first:
-        class: CleverAge\ProcessBundle\Transformer\Array\ArrayFirstTransformer
+    CleverAge\ProcessBundle\Transformer\Array\ArrayFirstTransformer:
         tags:
             - { name: cleverage.transformer, code: array_first }
-    CleverAge\ProcessBundle\Transformer\Array\ArrayFirstTransformer:
-        alias: cleverage_process.transformer.array_first
-        public: true
 
-    cleverage_process.transformer.array_last:
-        class: CleverAge\ProcessBundle\Transformer\Array\ArrayLastTransformer
+    CleverAge\ProcessBundle\Transformer\Array\ArrayLastTransformer:
         tags:
             - { name: cleverage.transformer, code: array_last }
-    CleverAge\ProcessBundle\Transformer\Array\ArrayLastTransformer:
-        alias: cleverage_process.transformer.array_last
-        public: true
 
-    cleverage_process.transformer.array_map:
-        class: CleverAge\ProcessBundle\Transformer\Array\ArrayMapTransformer
+    CleverAge\ProcessBundle\Transformer\Array\ArrayMapTransformer:
         tags:
             - { name: cleverage.transformer, code: array_map }
         arguments:
             - '@cleverage_process.registry.transformer'
-    CleverAge\ProcessBundle\Transformer\Array\ArrayMapTransformer:
-        alias: cleverage_process.transformer.array_map
-        public: true
 
-    cleverage_process.transformer.array_unset:
-        class: CleverAge\ProcessBundle\Transformer\Array\ArrayUnsetTransformer
+    CleverAge\ProcessBundle\Transformer\Array\ArrayUnsetTransformer:
         tags:
             - { name: cleverage.transformer, code: array_unset }
-    CleverAge\ProcessBundle\Transformer\Array\ArrayUnsetTransformer:
-        alias: cleverage_process.transformer.array_unset
-        public: true
 
-    cleverage_process.transformer.cached:
-        class: CleverAge\ProcessBundle\Transformer\CachedTransformer
+    CleverAge\ProcessBundle\Transformer\CachedTransformer:
         tags:
             - { name: cleverage.transformer, code: cached }
         arguments:
             - '@cleverage_process.registry.transformer'
             - '@cache.app'
             - '@logger'
-    CleverAge\ProcessBundle\Transformer\CachedTransformer:
-        alias: cleverage_process.transformer.cached
-        public: true
 
-    cleverage_process.transformer.callback:
-        class: CleverAge\ProcessBundle\Transformer\CallbackTransformer
+    CleverAge\ProcessBundle\Transformer\CallbackTransformer:
         tags:
             - { name: cleverage.transformer, code: callback }
-    CleverAge\ProcessBundle\Transformer\CallbackTransformer:
-        alias: cleverage_process.transformer.callback
-        public: true
 
-    cleverage_process.transformer.cast:
-        class: CleverAge\ProcessBundle\Transformer\CastTransformer
+    CleverAge\ProcessBundle\Transformer\CastTransformer:
         tags:
             - { name: cleverage.transformer, code: cast }
-    CleverAge\ProcessBundle\Transformer\CastTransformer:
-        alias: cleverage_process.transformer.cast
-        public: true
 
-    cleverage_process.transformer.constant:
-        class: CleverAge\ProcessBundle\Transformer\ConstantTransformer
+    CleverAge\ProcessBundle\Transformer\ConstantTransformer:
         tags:
             - { name: cleverage.transformer, code: constant }
-    CleverAge\ProcessBundle\Transformer\ConstantTransformer:
-        alias: cleverage_process.transformer.constant
-        public: true
 
-    cleverage_process.transformer.convert_value:
-        class: CleverAge\ProcessBundle\Transformer\ConvertValueTransformer
+    CleverAge\ProcessBundle\Transformer\ConvertValueTransformer:
         tags:
             - { name: cleverage.transformer, code: convert_value }
-    CleverAge\ProcessBundle\Transformer\ConvertValueTransformer:
-        alias: cleverage_process.transformer.convert_value
-        public: true
 
-    cleverage_process.transformer.date_format:
-        class: CleverAge\ProcessBundle\Transformer\Date\DateFormatTransformer
+    CleverAge\ProcessBundle\Transformer\Date\DateFormatTransformer:
         tags:
             - { name: cleverage.transformer, code: date_format }
-    CleverAge\ProcessBundle\Transformer\Date\DateFormatTransformer:
-        alias: cleverage_process.transformer.date_format
-        public: true
 
-    cleverage_process.transformer.date_parser:
-        class: CleverAge\ProcessBundle\Transformer\Date\DateParserTransformer
+    CleverAge\ProcessBundle\Transformer\Date\DateParserTransformer:
         tags:
             - { name: cleverage.transformer, code: date_parser }
-    CleverAge\ProcessBundle\Transformer\Date\DateParserTransformer:
-        alias: cleverage_process.transformer.date_parser
-        public: true
 
-    cleverage_process.transformer.debug:
-        class: CleverAge\ProcessBundle\Transformer\DebugTransformer
+    CleverAge\ProcessBundle\Transformer\DebugTransformer:
         tags:
             - { name: cleverage.transformer, code: dump }
-    CleverAge\ProcessBundle\Transformer\DebugTransformer:
-        alias: cleverage_process.transformer.debug
-        public: true
 
-    cleverage_process.transformer.default:
-        class: CleverAge\ProcessBundle\Transformer\DefaultTransformer
+    CleverAge\ProcessBundle\Transformer\DefaultTransformer:
         tags:
             - { name: cleverage.transformer, code: default }
-    CleverAge\ProcessBundle\Transformer\DefaultTransformer:
-        alias: cleverage_process.transformer.default
-        public: true
 
-    cleverage_process.transformer.evaluator:
-        class: CleverAge\ProcessBundle\Transformer\EvaluatorTransformer
+    CleverAge\ProcessBundle\Transformer\EvaluatorTransformer:
         tags:
             - { name: cleverage.transformer, code: evaluator }
-    CleverAge\ProcessBundle\Transformer\EvaluatorTransformer:
-        alias: cleverage_process.transformer.evaluator
-        public: true
 
-    cleverage_process.transformer.expression_language_map:
-        class: CleverAge\ProcessBundle\Transformer\ExpressionLanguageMapTransformer
+    CleverAge\ProcessBundle\Transformer\ExpressionLanguageMapTransformer:
         tags:
             - { name: cleverage.transformer, code: expression_language_map }
         arguments:
             - '@cleverage_process.expression_language'
-    CleverAge\ProcessBundle\Transformer\ExpressionLanguageMapTransformer:
-        alias: cleverage_process.transformer.expression_language_map
-        public: true
 
-    cleverage_process.transformer.mapping:
-        class: CleverAge\ProcessBundle\Transformer\MappingTransformer
+    CleverAge\ProcessBundle\Transformer\MappingTransformer:
         tags:
             - { name: cleverage.transformer, code: mapping }
         arguments:
             - '@cleverage_process.registry.transformer'
             - '@logger'
             - '@property_accessor'
-    CleverAge\ProcessBundle\Transformer\MappingTransformer:
-        alias: cleverage_process.transformer.mapping
-        public: true
 
-    cleverage_process.transformer.multi_replace:
-        class: CleverAge\ProcessBundle\Transformer\MultiReplaceTransformer
+    CleverAge\ProcessBundle\Transformer\MultiReplaceTransformer:
         tags:
             - { name: cleverage.transformer, code: multi_replace }
-    CleverAge\ProcessBundle\Transformer\MultiReplaceTransformer:
-        alias: cleverage_process.transformer.multi_replace
-        public: true
 
-    cleverage_process.transformer.instantiate:
-        class: CleverAge\ProcessBundle\Transformer\Object\InstantiateTransformer
+    CleverAge\ProcessBundle\Transformer\Object\InstantiateTransformer:
         tags:
             - { name: cleverage.transformer, code: instantiate }
-    CleverAge\ProcessBundle\Transformer\Object\InstantiateTransformer:
-        alias: cleverage_process.transformer.instantiate
-        public: true
 
-    cleverage_process.transformer.property_accessor:
-        class: CleverAge\ProcessBundle\Transformer\Object\PropertyAccessorTransformer
+    CleverAge\ProcessBundle\Transformer\Object\PropertyAccessorTransformer:
         tags:
             - { name: cleverage.transformer, code: property_accessor }
         arguments:
             - '@property_accessor'
-    CleverAge\ProcessBundle\Transformer\Object\PropertyAccessorTransformer:
-        alias: cleverage_process.transformer.property_accessor
-        public: true
 
-    cleverage_process.transformer.recursive_property_setter:
-        class: CleverAge\ProcessBundle\Transformer\Object\RecursivePropertySetterTransformer
+    CleverAge\ProcessBundle\Transformer\Object\RecursivePropertySetterTransformer:
         tags:
             - { name: cleverage.transformer, code: recursive_property_setter }
         arguments:
             - '@property_accessor'
-    CleverAge\ProcessBundle\Transformer\Object\RecursivePropertySetterTransformer:
-        alias: cleverage_process.transformer.recursive_property_setter
-        public: true
 
-    cleverage_process.transformer.preg_filter:
-        class: CleverAge\ProcessBundle\Transformer\PregFilterTransformer
+    CleverAge\ProcessBundle\Transformer\PregFilterTransformer:
         tags:
             - { name: cleverage.transformer, code: preg_filter }
-    CleverAge\ProcessBundle\Transformer\PregFilterTransformer:
-        alias: cleverage_process.transformer.preg_filter
-        public: true
 
-    cleverage_process.transformer.rules:
-        class: CleverAge\ProcessBundle\Transformer\RulesTransformer
+    CleverAge\ProcessBundle\Transformer\RulesTransformer:
         tags:
             - { name: cleverage.transformer, code: rules }
         arguments:
             - '@cleverage_process.registry.transformer'
             - '@cleverage_process.expression_language'
-    CleverAge\ProcessBundle\Transformer\RulesTransformer:
-        alias: cleverage_process.transformer.rules
-        public: true
 
-    cleverage_process.transformer.denormalize:
-        class: CleverAge\ProcessBundle\Transformer\Serialization\DenormalizeTransformer
+    CleverAge\ProcessBundle\Transformer\Serialization\DenormalizeTransformer:
         tags:
             - { name: cleverage.transformer, code: denormalize }
         arguments:
             - '@serializer'
-    CleverAge\ProcessBundle\Transformer\Serialization\DenormalizeTransformer:
-        alias: cleverage_process.transformer.denormalize
-        public: true
 
-    cleverage_process.transformer.normalize:
-        class: CleverAge\ProcessBundle\Transformer\Serialization\NormalizeTransformer
+    CleverAge\ProcessBundle\Transformer\Serialization\NormalizeTransformer:
         tags:
             - { name: cleverage.transformer, code: normalize }
         arguments:
             - '@serializer'
-    CleverAge\ProcessBundle\Transformer\Serialization\NormalizeTransformer:
-        alias: cleverage_process.transformer.normalize
-        public: true
 
-    cleverage_process.transformer.explode:
-        class: CleverAge\ProcessBundle\Transformer\String\ExplodeTransformer
+    CleverAge\ProcessBundle\Transformer\String\ExplodeTransformer:
         tags:
             - { name: cleverage.transformer, code: explode }
-    CleverAge\ProcessBundle\Transformer\String\ExplodeTransformer:
-        alias: cleverage_process.transformer.explode
-        public: true
 
-    cleverage_process.transformer.hash:
-        class: CleverAge\ProcessBundle\Transformer\String\HashTransformer
+    CleverAge\ProcessBundle\Transformer\String\HashTransformer:
         tags:
             - { name: cleverage.transformer, code: hash }
-    CleverAge\ProcessBundle\Transformer\String\HashTransformer:
-        alias: cleverage_process.transformer.hash
-        public: true
 
-    cleverage_process.transformer.implode:
-        class: CleverAge\ProcessBundle\Transformer\String\ImplodeTransformer
+    CleverAge\ProcessBundle\Transformer\String\ImplodeTransformer:
         tags:
             - { name: cleverage.transformer, code: implode }
-    CleverAge\ProcessBundle\Transformer\String\ImplodeTransformer:
-        alias: cleverage_process.transformer.implode
-        public: true
 
-    cleverage_process.transformer.preg_match:
-        class: CleverAge\ProcessBundle\Transformer\String\PregMatchTransformer
+    CleverAge\ProcessBundle\Transformer\String\PregMatchTransformer:
         tags:
             - { name: cleverage.transformer, code: preg_match }
-    CleverAge\ProcessBundle\Transformer\String\PregMatchTransformer:
-        alias: cleverage_process.transformer.preg_match
-        public: true
 
-    cleverage_process.transformer.slugify:
-        class: CleverAge\ProcessBundle\Transformer\String\SlugifyTransformer
+    CleverAge\ProcessBundle\Transformer\String\SlugifyTransformer:
         tags:
             - { name: cleverage.transformer, code: slugify }
-    CleverAge\ProcessBundle\Transformer\String\SlugifyTransformer:
-        alias: cleverage_process.transformer.slugify
-        public: true
 
-    cleverage_process.transformer.sprintf:
-        class: CleverAge\ProcessBundle\Transformer\String\SprintfTransformer
+    CleverAge\ProcessBundle\Transformer\String\SprintfTransformer:
         tags:
             - { name: cleverage.transformer, code: sprintf }
-    CleverAge\ProcessBundle\Transformer\String\SprintfTransformer:
-        alias: cleverage_process.transformer.sprintf
-        public: true
 
-    cleverage_process.transformer.trim:
-        class: CleverAge\ProcessBundle\Transformer\String\TrimTransformer
+    CleverAge\ProcessBundle\Transformer\String\TrimTransformer:
         tags:
             - { name: cleverage.transformer, code: trim }
-    CleverAge\ProcessBundle\Transformer\String\TrimTransformer:
-        alias: cleverage_process.transformer.trim
-        public: true
 
-    cleverage_process.transformer.type_setter:
-        class: CleverAge\ProcessBundle\Transformer\TypeSetterTransformer
+    CleverAge\ProcessBundle\Transformer\TypeSetterTransformer:
         tags:
             - { name: cleverage.transformer, code: type_setter }
-    CleverAge\ProcessBundle\Transformer\TypeSetterTransformer:
-        alias: cleverage_process.transformer.type_setter
-        public: true
 
-    cleverage_process.transformer.unset:
-        class: CleverAge\ProcessBundle\Transformer\UnsetTransformer
+    CleverAge\ProcessBundle\Transformer\UnsetTransformer:
         tags:
             - { name: cleverage.transformer, code: unset }
         arguments:
             - '@property_accessor'
-    CleverAge\ProcessBundle\Transformer\UnsetTransformer:
-        alias: cleverage_process.transformer.unset
-        public: true
 
-    cleverage_process.transformer.wrapper:
-        class: CleverAge\ProcessBundle\Transformer\WrapperTransformer
+    CleverAge\ProcessBundle\Transformer\WrapperTransformer:
         tags:
             - { name: cleverage.transformer, code: wrapper }
-    CleverAge\ProcessBundle\Transformer\WrapperTransformer:
-        alias: cleverage_process.transformer.wrapper
-        public: true
 
-    cleverage_process.transformer.xpath_evaluator:
-        class: CleverAge\ProcessBundle\Transformer\Xml\XpathEvaluatorTransformer
+    CleverAge\ProcessBundle\Transformer\Xml\XpathEvaluatorTransformer:
         tags:
             - { name: cleverage.transformer, code: xpath_evaluator }
-    CleverAge\ProcessBundle\Transformer\Xml\XpathEvaluatorTransformer:
-        alias: cleverage_process.transformer.xpath_evaluator
-        public: true
diff --git a/docs/01-quick_start.md b/docs/01-quick_start.md
index ed0ad362..f83b0a96 100644
--- a/docs/01-quick_start.md
+++ b/docs/01-quick_start.md
@@ -121,11 +121,11 @@ clever_age_process:
             tasks: []
 ```
 
-Then you can add tasks in this array. They consist of a `service`, optionally configured by `options`, and eventually
+Then you can add tasks in this array. They consist of a `task` code, optionally configured by `options`, and eventually
 chained with others through their `outputs`. Minimal syntax is:
 ```yaml
 <task_name>:
-    service: <service_reference>
+    task: <task_code>               # e.g. transformer, see the reference page of each task
     options: 
         <option_key_1>: <option_value_1>
         <option_key_2>: <option_value_2>
@@ -154,7 +154,7 @@ clever_age_process:
         project_prefix.process_name:
             tasks:
                 extract:
-                    service: '@CleverAge\ProcessBundle\Task\ConstantOutputTask'
+                    task: constant_output
                     options:
                         output:
                             id: 123
@@ -163,7 +163,7 @@ clever_age_process:
                     outputs: [transform]
 
                 transform:
-                    service: '@CleverAge\ProcessBundle\Task\TransformerTask'
+                    task: transformer
                     options:
                         transformers:
                             mapping:
@@ -181,7 +181,7 @@ clever_age_process:
                     outputs: [load]
 
                 load:
-                    service: '@CleverAge\ProcessBundle\Task\Debug\DebugTask'
+                    task: debug
 ```
 
 There is more to know about process configuration. See [the full process configuration reference](reference/01-process_definition.md)
@@ -257,7 +257,7 @@ task of the process:
 
 ```yaml
 read:
-    service: '@CleverAge\ProcessBundle\Task\File\Csv\CsvReaderTask'
+    task: csv_reader
     options:
         file_path: '%kernel.project_dir%/var/import/{{ file_name }}'
 ```
diff --git a/docs/03-custom_tasks.md b/docs/03-custom_tasks.md
index 6fbb962d..f019c486 100644
--- a/docs/03-custom_tasks.md
+++ b/docs/03-custom_tasks.md
@@ -9,12 +9,12 @@ create your own.
 
 As stated before, tasks are simple services implementing `CleverAge\ProcessBundle\Model\TaskInterface`, so you can
 design them like any other service, with only small specificities:
-- the service does **not need to be public**: the process manager fetches it, using the `service` reference of the
-  task configuration (a service id or alias, with or without the leading `@`, see
-  [task definition](reference/02-task_definition.md#task-attributes)), from a service locator built from the process
-  configurations when the container is compiled. Only a service that is not referenced by these configurations (e.g. a
-  configuration added at runtime) is fetched from the service container, which requires a public service and is
-  deprecated
+- the service should have a **code**, to reference it in the process configurations (`task: <code>`, see
+  [task code](#task-code))
+- the service does **not need to be public**: the process manager fetches it from a service locator built from the
+  process configurations when the container is compiled. Only a service that is not referenced by these configurations
+  (e.g. a configuration added at runtime) is fetched from the service container, which requires a public service and
+  is deprecated
 - the service should **not be shared** ([`shared: false`](https://symfony.com/doc/current/service_container/shared.html))
 
 Most of the time you don't want a task declared in a process to share some data with another declaration using the
@@ -52,6 +52,42 @@ services:
 If your `services.yaml` also has the default `App\:` resource (which includes `src/Task/`), declare `App\Task\:` after
 it: the last definition of a service wins.
 
+### Task code
+
+A task is referenced in the process configurations by its code (`task: app_my_task`, see
+[task definition](reference/02-task_definition.md#task-attributes); referencing it by its service,
+`service: '@App\Task\MyTask'`, is deprecated since 5.4). Give your task a code: with autoconfiguration, add the
+`CleverAge\ProcessBundle\Attribute\AsTask` attribute to the class; without, add a `cleverage.task` tag with a `code`
+attribute to the service. Use an internal prefix in your codes to avoid conflicts
+with the tasks of the bundles. Two services cannot share the same code (the container compilation fails).
+
+```php
+namespace App\Task;
+
+use CleverAge\ProcessBundle\Attribute\AsTask;
+use CleverAge\ProcessBundle\Model\ProcessState;
+use CleverAge\ProcessBundle\Model\TaskInterface;
+
+#[AsTask(code: 'app_my_task')]
+class MyTask implements TaskInterface
+{
+    public function execute(ProcessState $state): void
+    {
+        // ...
+    }
+}
+```
+
+```yaml
+# Without autoconfiguration
+services:
+    App\Task\MyTask:
+        autowire: true
+        shared: false
+        tags:
+            - { name: cleverage.task, code: app_my_task }
+```
+
 ## Using the state object
 
 With the `TaskInterface::execute` method comes a small container object: the state
@@ -140,7 +176,7 @@ class PrefixTask extends AbstractConfigurableTask
 
 ```yaml
 prefix:
-    service: '@App\Task\PrefixTask'
+    task: app_prefix                # with #[AsTask(code: 'app_prefix')] on the class, see "task code" above
     options:
         prefix: 'SKU-'
 ```
@@ -269,7 +305,7 @@ standard additions.
 
 ```yaml
 transform:
-    service: '@CleverAge\ProcessBundle\Task\TransformerTask'
+    task: transformer
     options:
         transformers:
             app_vat:
diff --git a/docs/04-advanced_workflow.md b/docs/04-advanced_workflow.md
index a30ff54e..0dac8136 100644
--- a/docs/04-advanced_workflow.md
+++ b/docs/04-advanced_workflow.md
@@ -29,18 +29,15 @@ the process code, the task code and the original message. The original exception
 
 ### Executing a process from PHP
 
-The process manager service id is `cleverage_process.manager.process`. It is private and has no class alias, so it
-cannot be autowired by type: inject it explicitly (or declare the alias yourself).
+The process manager service (`cleverage_process.manager.process`, private) can be autowired by its class,
+`CleverAge\ProcessBundle\Manager\ProcessManager`, or injected explicitly:
 
 ```yaml
 # config/services.yaml
 services:
     App\Service\ProductImporter:
         arguments:
-            $processManager: '@cleverage_process.manager.process'
-
-    # Or, to enable autowiring of the ProcessManager type everywhere:
-    CleverAge\ProcessBundle\Manager\ProcessManager: '@cleverage_process.manager.process'
+            $processManager: '@cleverage_process.manager.process' # not needed with autowiring
 ```
 
 ```php
@@ -72,12 +69,12 @@ clever_age_process:
         app.csv_copy:
             tasks:
                 read:
-                    service: '@CleverAge\ProcessBundle\Task\File\Csv\CsvReaderTask'
+                    task: csv_reader
                     options:
                         file_path: '%kernel.project_dir%/var/data/input.csv'
                     outputs: [transform]
                 transform:
-                    service: '@CleverAge\ProcessBundle\Task\TransformerTask'
+                    task: transformer
                     options:
                         transformers:
                             mapping:
@@ -86,12 +83,12 @@ clever_age_process:
                                     name: { code: '[name]' }
                     outputs: [write]
                 write:
-                    service: '@CleverAge\ProcessBundle\Task\File\Csv\CsvWriterTask'
+                    task: csv_writer
                     options:
                         file_path: '%kernel.project_dir%/var/data/output.csv'
                     outputs: [log]
                 log:
-                    service: '@CleverAge\ProcessBundle\Task\Debug\DebugTask'
+                    task: debug
 ```
 
 ### Orphan tasks
@@ -123,7 +120,7 @@ stops.
 
 ```yaml
 transform:
-    service: '@CleverAge\ProcessBundle\Task\TransformerTask'
+    task: transformer
     error_strategy: skip          # Continue with the next item on error
     log_level: warning            # Log errors as warning instead of critical
     options:
@@ -134,7 +131,7 @@ transform:
     outputs: [write]
     error_outputs: [write_errors] # Receives the input that failed
 write_errors:
-    service: '@CleverAge\ProcessBundle\Task\File\JsonStream\JsonStreamWriterTask'
+    task: json_stream_writer
     options:
         file_path: '%kernel.project_dir%/var/data/errors_{date_time}.json-stream'
 ```
@@ -165,13 +162,13 @@ clever_age_process:
         app.import_all:
             tasks:
                 list_files:
-                    service: '@CleverAge\ProcessBundle\Task\File\FolderBrowserTask'
+                    task: folder_browser
                     options:
                         folder_path: '%kernel.project_dir%/var/import'
                         name_pattern: '*.csv'
                     outputs: [import_file]
                 import_file:
-                    service: '@CleverAge\ProcessBundle\Task\Process\ProcessExecutorTask'
+                    task: process_executor
                     options:
                         process: app.import_file
                         context:
@@ -182,10 +179,10 @@ clever_age_process:
             entry_point: read
             tasks:
                 read:
-                    service: '@CleverAge\ProcessBundle\Task\File\Csv\InputCsvReaderTask'
+                    task: input_csv_reader
                     outputs: [save]
                 save:
-                    service: '@App\Task\SaveProductTask'
+                    task: app_save_product # code of an application task, see #[AsTask]
 ```
 
 If the parent process is executed without a `dry_run` context value, the placeholder is not replaced and the
@@ -313,7 +310,7 @@ PHP executes a process in a single thread. To use several CPU cores, the
 
 ```yaml
 parallel_import:
-    service: '@CleverAge\ProcessBundle\Task\Process\ProcessLauncherTask'
+    task: process_launcher
     options:
         process: app.import_file
         max_processes: 4
diff --git a/docs/06-testing.md b/docs/06-testing.md
index ff8786e3..d0b61350 100644
--- a/docs/06-testing.md
+++ b/docs/06-testing.md
@@ -116,7 +116,7 @@ clever_age_process:
             end_point: transform
             tasks:
                 transform:
-                    service: '@CleverAge\ProcessBundle\Task\TransformerTask'
+                    task: transformer
                     options:
                         transformers:
                             app_vat:
diff --git a/docs/cookbooks/01-common_setup.md b/docs/cookbooks/01-common_setup.md
index 746cc3fe..afa29816 100644
--- a/docs/cookbooks/01-common_setup.md
+++ b/docs/cookbooks/01-common_setup.md
@@ -115,14 +115,14 @@ clever_age_process:
             help: 'bin/console cleverage:process:execute app.file_import -c "file:''products.csv''"'
             tasks:
                 read_csv:
-                    service: '@CleverAge\ProcessBundle\Task\File\Csv\CsvReaderTask'
+                    task: csv_reader
                     options:
                         file_path: '%kernel.project_dir%/var/data/{{ file }}'
                         delimiter: ';'
                     outputs: [transform]
 
                 transform:
-                    service: '@CleverAge\ProcessBundle\Task\TransformerTask'
+                    task: transformer
                     error_strategy: skip
                     options:
                         transformers:
@@ -142,7 +142,7 @@ clever_age_process:
                     outputs: [write_csv]
 
                 write_csv:
-                    service: '@CleverAge\ProcessBundle\Task\File\Csv\CsvWriterTask'
+                    task: csv_writer
                     options:
                         file_path: '%kernel.project_dir%/var/output/products_prepared_{date_time}.csv'
                         headers: [id, slug]
diff --git a/docs/cookbooks/etl_aggregate_reports.md b/docs/cookbooks/etl_aggregate_reports.md
index 26941dc4..0e3c9309 100644
--- a/docs/cookbooks/etl_aggregate_reports.md
+++ b/docs/cookbooks/etl_aggregate_reports.md
@@ -17,18 +17,18 @@ clever_age_process:
             description: 'Aggregate API logs per service'
             tasks:
                 list_sources:
-                    service: '@CleverAge\ProcessBundle\Task\File\FolderBrowserTask'
+                    task: folder_browser
                     options:
                         folder_path: '%kernel.project_dir%/var/logs/api'
                         name_pattern: '*.json-stream'
                     outputs: [read_log]
 
                 read_log:
-                    service: '@CleverAge\ProcessBundle\Task\File\JsonStream\JsonStreamReaderTask' # Reads the file path given as input
+                    task: json_stream_reader # Reads the file path given as input
                     outputs: [map_log]
 
                 map_log:
-                    service: '@CleverAge\ProcessBundle\Task\TransformerTask'
+                    task: transformer
                     options:
                         transformers:
                             mapping:
@@ -39,7 +39,7 @@ clever_age_process:
                     outputs: [group_by_service]
 
                 group_by_service:
-                    service: '@CleverAge\ProcessBundle\Task\RowAggregatorTask'
+                    task: row_aggregator
                     options:
                         aggregate_by: service
                         aggregate_columns: [duration, status]
@@ -47,11 +47,11 @@ clever_age_process:
                     outputs: [iterate_services]
 
                 iterate_services:
-                    service: '@CleverAge\ProcessBundle\Task\InputIteratorTask'
+                    task: input_iterator
                     outputs: [compute_stats]
 
                 compute_stats:
-                    service: '@CleverAge\ProcessBundle\Task\TransformerTask'
+                    task: transformer
                     options:
                         transformers:
                             mapping:
@@ -74,7 +74,7 @@ clever_age_process:
                     outputs: [write_summary]
 
                 write_summary:
-                    service: '@CleverAge\ProcessBundle\Task\File\Csv\CsvWriterTask'
+                    task: csv_writer
                     options:
                         file_path: '%kernel.project_dir%/var/exports/report_summary_{date}.csv'
                         headers: [service, calls, total_duration]
diff --git a/docs/cookbooks/etl_file_sync.md b/docs/cookbooks/etl_file_sync.md
index 30d36154..fb4518ef 100644
--- a/docs/cookbooks/etl_file_sync.md
+++ b/docs/cookbooks/etl_file_sync.md
@@ -11,14 +11,14 @@ clever_age_process:
             description: 'Normalize the catalog CSV file'
             tasks:
                 read_source:
-                    service: '@CleverAge\ProcessBundle\Task\File\Csv\CsvReaderTask'
+                    task: csv_reader
                     options:
                         file_path: '%kernel.project_dir%/var/data/catalog.csv'
                         delimiter: ';'
                     outputs: [filter_valid]
 
                 filter_valid:
-                    service: '@CleverAge\ProcessBundle\Task\FilterTask'
+                    task: filter
                     options:
                         not_empty:
                             '[sku]': ~
@@ -26,13 +26,13 @@ clever_age_process:
                     error_outputs: [log_rejected] # Lines without sku
 
                 log_rejected:
-                    service: '@CleverAge\ProcessBundle\Task\Reporting\LoggerTask'
+                    task: logger
                     options:
                         level: warning
                         message: 'Line without sku'
 
                 normalize:
-                    service: '@CleverAge\ProcessBundle\Task\TransformerTask'
+                    task: transformer
                     error_strategy: skip # A line with an invalid date is logged and skipped
                     options:
                         transformers:
@@ -55,20 +55,20 @@ clever_age_process:
                     outputs: [deduplicate, count_rows]
 
                 count_rows:
-                    service: '@CleverAge\ProcessBundle\Task\Reporting\StatCounterTask'
+                    task: stat_counter
 
                 deduplicate:
-                    service: '@CleverAge\ProcessBundle\Task\GroupByAggregateIterableTask'
+                    task: group_by_aggregate_iterable
                     options:
                         group_by_accessors: ['[sku]'] # The last line of each sku is kept
                     outputs: [iterate]
 
                 iterate:
-                    service: '@CleverAge\ProcessBundle\Task\InputIteratorTask'
+                    task: input_iterator
                     outputs: [write_target]
 
                 write_target:
-                    service: '@CleverAge\ProcessBundle\Task\File\Csv\CsvWriterTask'
+                    task: csv_writer
                     options:
                         file_path: '%kernel.project_dir%/var/exports/catalog_normalized_{date}.csv'
                         headers: [sku, price, updated_at]
diff --git a/docs/cookbooks/memory_usage_graph.md b/docs/cookbooks/memory_usage_graph.md
index 2976f127..2c509dfe 100644
--- a/docs/cookbooks/memory_usage_graph.md
+++ b/docs/cookbooks/memory_usage_graph.md
@@ -7,7 +7,7 @@ desktop environment.
 Add these tasks to your process:
 ```yaml
 memory:
-    service: '@CleverAge\ProcessBundle\Task\TransformerTask'
+    task: transformer
     options:
         transformers:
             mapping:
@@ -20,7 +20,7 @@ memory:
     outputs: [write_memory]
 
 write_memory:
-    service: '@CleverAge\ProcessBundle\Task\File\Csv\CsvWriterTask'
+    task: csv_writer
     options:
         file_path: '%kernel.project_dir%/memory.dat'
         headers: [memory_usage]
@@ -47,7 +47,7 @@ identify each of them. All measure tasks send their output to the same `write_me
 
 ```yaml
 memory_after_read:
-    service: '@CleverAge\ProcessBundle\Task\TransformerTask'
+    task: transformer
     options:
         transformers:
             mapping:
@@ -62,7 +62,7 @@ memory_after_read:
     outputs: [write_memory]
 
 memory_after_transform:
-    service: '@CleverAge\ProcessBundle\Task\TransformerTask'
+    task: transformer
     options:
         transformers:
             mapping:
@@ -77,7 +77,7 @@ memory_after_transform:
     outputs: [write_memory]
 
 write_memory:
-    service: '@CleverAge\ProcessBundle\Task\File\Csv\CsvWriterTask'
+    task: csv_writer
     options:
         file_path: '%kernel.project_dir%/memory_phase.csv'
         headers: [phase, memory_usage]
diff --git a/docs/reference/02-task_definition.md b/docs/reference/02-task_definition.md
index bcec492f..adeb9bd7 100644
--- a/docs/reference/02-task_definition.md
+++ b/docs/reference/02-task_definition.md
@@ -5,8 +5,8 @@ YAML Configuration
 ------------------
 
 ```yaml
-<task_code>:
-    service: <service reference>
+<task_name>:                       # name of the task in the process, used in the outputs
+    task: <code of the task>       # service: <service reference> is deprecated
     description: <string>
     help: <multiline string>
     options: <task options>
@@ -20,27 +20,26 @@ YAML Configuration
 Task attributes
 ---------------
 
-**service**: required, reference to the service used for the task: a service **id** or a service **alias**, with or
-without a leading `@` (quote the value when it starts with `@`, as YAML requires). The service must implement
-`CleverAge\ProcessBundle\Model\TaskInterface`. For instance, the `UnzipTask` of the archive bridge is registered as
-`cleverage_archive_process.task.unzip`, with an alias named after its class: these four references are equivalent.
+**task**: required, code of the task, e.g. `task: transformer`. The code of each task of this bundle is given on its
+[reference page](tasks/) (e.g. `transformer` for the [TransformerTask](tasks/transformer_task.md)); the code of a task
+service is declared with a `cleverage.task` tag with a `code` attribute, or with the
+`#[CleverAge\ProcessBundle\Attribute\AsTask(code: '...')]` attribute (see
+[custom tasks](../03-custom_tasks.md#task-code)). A code is **unique**: it identifies a single task service in the
+application (the tasks of this bundle have unprefixed codes, use a prefix for the ones of your own tasks), two services
+with the same code fail the container compilation.
+The codes are resolved when the container is compiled: an unknown code fails the compilation, with the list of the
+known codes. The services of the tasks referenced by the process
+configurations are collected when the container is compiled, so they can be private.
 
-```yaml
-service: '@cleverage_archive_process.task.unzip'                  # id, with @
-service: cleverage_archive_process.task.unzip                     # id, without @
-service: '@CleverAge\ArchiveProcessBundle\Task\UnzipTask'         # alias, with @
-service: CleverAge\ArchiveProcessBundle\Task\UnzipTask            # alias, without @
-```
-
-The tasks of this bundle and of the bridge bundles are registered with a `cleverage_process.task.*` /
-`cleverage_*_process.task.*` id and an alias named after their class (e.g. `cleverage_process.task.transformer` and
-`'@CleverAge\ProcessBundle\Task\TransformerTask'`, the class name being the reference used in this documentation), and
-your own task services with any id or alias you choose. With an unknown service, a reference with `@` throws the
-`ServiceNotFoundException` of the service container, a reference without `@` an `\UnexpectedValueException`
-(`Unable to resolve service reference for Task '<task code>'`).
+**service**: **deprecated since 5.4, removed in v6.0**, use `task`. Reference to the service used for the task, instead
+of its code: its service id, with or without a leading `@` (quote the value when it starts with `@`, as YAML requires),
+e.g. `service: '@CleverAge\ProcessBundle\Task\TransformerTask'` (the tasks of this bundle have their class name as
+service id). The service must implement `CleverAge\ProcessBundle\Model\TaskInterface`. With an unknown service, a
+reference with `@` throws the `ServiceNotFoundException` of the service container, a reference without `@` an
+`\UnexpectedValueException` (`Unable to resolve service reference for Task '<task code>'`). A task defines either `task`
+or `service`, not both.
 
-The services referenced by the process configurations are collected when the container is compiled, so they can be
-private (as well as the aliases). Only a service that is not referenced by these configurations (e.g. a configuration
+Only a service that is not referenced by the configurations known when the container is compiled (e.g. a configuration
 added at runtime) is fetched from the service container, which requires a public service and is deprecated since 5.4.
 
 **description**: optional string to describe a task, displayed in process help (should not exceed one line).
diff --git a/docs/reference/03-generic_transformers_definition.md b/docs/reference/03-generic_transformers_definition.md
index 90a24f35..606fb990 100644
--- a/docs/reference/03-generic_transformers_definition.md
+++ b/docs/reference/03-generic_transformers_definition.md
@@ -62,7 +62,7 @@ clever_age_process:
         app.demo:
             tasks:
                 transform:
-                    service: '@CleverAge\ProcessBundle\Task\TransformerTask'
+                    task: transformer
                     options:
                         transformers:
                             mapping:
diff --git a/docs/reference/tasks/_template.md b/docs/reference/tasks/_template.md
index 919390a2..1aa1c46f 100644
--- a/docs/reference/tasks/_template.md
+++ b/docs/reference/tasks/_template.md
@@ -7,6 +7,7 @@ Task reference
 --------------
 
 * **Service**: `Fully\Qualified\ClassName`
+* **Code**: `task_code` (`task: task_code`)
 * **Iterable task** _(only if it implements `IterableTaskInterface`)_
 * **Blocking task** _(only if it implements `BlockingTaskInterface`)_
 * **Flushable task** _(only if it implements `FlushableTaskInterface`)_
@@ -39,7 +40,7 @@ Examples
 ```yaml
 # Task configuration level
 code:
-  service: '@Fully\Qualified\ClassName'
+  task: task_code
   options:
     a: 1
     b: 2
diff --git a/docs/reference/tasks/advanced_stat_counter_task.md b/docs/reference/tasks/advanced_stat_counter_task.md
index a30924da..8425722d 100644
--- a/docs/reference/tasks/advanced_stat_counter_task.md
+++ b/docs/reference/tasks/advanced_stat_counter_task.md
@@ -9,6 +9,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\Reporting\AdvancedStatCounterTask`
+* **Code**: `advanced_stat_counter` (`task: advanced_stat_counter`)
 
 Accepted inputs
 ---------------
@@ -43,7 +44,7 @@ Examples
 ```yaml
 # Task configuration level
 stats:
-  service: '@CleverAge\ProcessBundle\Task\Reporting\AdvancedStatCounterTask'
+  task: advanced_stat_counter
   options:
     num_items: 50
     show_every: 100
diff --git a/docs/reference/tasks/aggregate_iterable_task.md b/docs/reference/tasks/aggregate_iterable_task.md
index 246d6b0d..4a2354b8 100644
--- a/docs/reference/tasks/aggregate_iterable_task.md
+++ b/docs/reference/tasks/aggregate_iterable_task.md
@@ -8,6 +8,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\AggregateIterableTask`
+* **Code**: `aggregate_iterable` (`task: aggregate_iterable`)
 * **Blocking task**
 
 Accepted inputs
@@ -33,10 +34,10 @@ Examples
 ```yaml
 # Task configuration level
 data:
-  service: '@CleverAge\ProcessBundle\Task\ConstantIterableOutputTask'
+  task: constant_iterable_output
   options:
     output: [1, 2, 3]
   outputs: [aggregate]
 aggregate:
-  service: '@CleverAge\ProcessBundle\Task\AggregateIterableTask'
+  task: aggregate_iterable
 ```
diff --git a/docs/reference/tasks/array_merge_task.md b/docs/reference/tasks/array_merge_task.md
index 6b85199c..489a6bd0 100644
--- a/docs/reference/tasks/array_merge_task.md
+++ b/docs/reference/tasks/array_merge_task.md
@@ -8,6 +8,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\ArrayMergeTask`
+* **Code**: `array_merge` (`task: array_merge`)
 * **Blocking task**
 
 Accepted inputs
@@ -35,14 +36,14 @@ Examples
 ```yaml
 # Task configuration level
 data:
-  service: '@CleverAge\ProcessBundle\Task\ConstantIterableOutputTask'
+  task: constant_iterable_output
   options:
     output:
       - { a: 1, b: { c: 2 } }
       - { b: { d: 3 } }
   outputs: [merge]
 merge:
-  service: '@CleverAge\ProcessBundle\Task\ArrayMergeTask'
+  task: array_merge
   options:
     merge_function: array_replace_recursive
 ```
diff --git a/docs/reference/tasks/column_aggregator_task.md b/docs/reference/tasks/column_aggregator_task.md
index 5a72508d..6eaea8d7 100644
--- a/docs/reference/tasks/column_aggregator_task.md
+++ b/docs/reference/tasks/column_aggregator_task.md
@@ -8,6 +8,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\ColumnAggregatorTask`
+* **Code**: `column_aggregator` (`task: column_aggregator`)
 * **Blocking task**
 
 Accepted inputs
@@ -47,10 +48,10 @@ Examples
 ```yaml
 # Task configuration level
 iterate:
-  service: '@CleverAge\ProcessBundle\Task\InputIteratorTask'
+  task: input_iterator
   outputs: [aggregate_a]
 aggregate_a:
-  service: '@CleverAge\ProcessBundle\Task\ColumnAggregatorTask'
+  task: column_aggregator
   options:
     columns: [col1]
     condition:
diff --git a/docs/reference/tasks/command_runner_task.md b/docs/reference/tasks/command_runner_task.md
index b2749b94..ce2f9047 100644
--- a/docs/reference/tasks/command_runner_task.md
+++ b/docs/reference/tasks/command_runner_task.md
@@ -8,6 +8,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\Process\CommandRunnerTask`
+* **Code**: `command_runner` (`task: command_runner`)
 
 Accepted inputs
 ---------------
@@ -41,7 +42,7 @@ Examples
 ```yaml
 # Task configuration level
 count_lines:
-  service: '@CleverAge\ProcessBundle\Task\Process\CommandRunnerTask'
+  task: command_runner
   options:
     commandline: ['wc', '-l']
     timeout: 30
@@ -53,7 +54,7 @@ count_lines:
 ```yaml
 # Task configuration level
 count_errors:
-  service: '@CleverAge\ProcessBundle\Task\Process\CommandRunnerTask'
+  task: command_runner
   options:
     commandline: 'grep "$PATTERN" | wc -l'
     env:
diff --git a/docs/reference/tasks/constant_iterable_output_task.md b/docs/reference/tasks/constant_iterable_output_task.md
index cb4c9d78..7b78323c 100644
--- a/docs/reference/tasks/constant_iterable_output_task.md
+++ b/docs/reference/tasks/constant_iterable_output_task.md
@@ -8,6 +8,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\ConstantIterableOutputTask`
+* **Code**: `constant_iterable_output` (`task: constant_iterable_output`)
 * **Iterable task**
 
 Accepted inputs
@@ -35,7 +36,7 @@ Examples
 ```yaml
 # Task configuration level
 entry:
-  service: '@CleverAge\ProcessBundle\Task\ConstantIterableOutputTask'
+  task: constant_iterable_output
   options:
     output:
       id: 123
diff --git a/docs/reference/tasks/constant_output_task.md b/docs/reference/tasks/constant_output_task.md
index 165f49c0..0faea2c3 100644
--- a/docs/reference/tasks/constant_output_task.md
+++ b/docs/reference/tasks/constant_output_task.md
@@ -8,6 +8,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\ConstantOutputTask`
+* **Code**: `constant_output` (`task: constant_output`)
 
 Accepted inputs
 ---------------
@@ -34,7 +35,7 @@ Examples
 ```yaml
 # Task configuration level
 entry:
-  service: '@CleverAge\ProcessBundle\Task\ConstantOutputTask'
+  task: constant_output
   options:
     output:
       id: 123
diff --git a/docs/reference/tasks/counter_task.md b/docs/reference/tasks/counter_task.md
index 79067612..268288d5 100644
--- a/docs/reference/tasks/counter_task.md
+++ b/docs/reference/tasks/counter_task.md
@@ -9,6 +9,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\CounterTask`
+* **Code**: `counter` (`task: counter`)
 * **Flushable task**
 
 Accepted inputs
@@ -37,12 +38,12 @@ Examples
 ```yaml
 # Task configuration level
 entry:
-  service: '@CleverAge\ProcessBundle\Task\ConstantIterableOutputTask'
+  task: constant_iterable_output
   options:
     output: [1, 2, 3, 4, 5, 6, 7, 8, 9]
   outputs: [counter]
 counter:
-  service: '@CleverAge\ProcessBundle\Task\CounterTask'
+  task: counter
   options:
     flush_every: 3
   outputs: [debug]
diff --git a/docs/reference/tasks/csv_reader_task.md b/docs/reference/tasks/csv_reader_task.md
index 4e85c2cc..efa3d5c5 100644
--- a/docs/reference/tasks/csv_reader_task.md
+++ b/docs/reference/tasks/csv_reader_task.md
@@ -8,6 +8,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\File\Csv\CsvReaderTask`
+* **Code**: `csv_reader` (`task: csv_reader`)
 * **Iterable task**
 
 Accepted inputs
@@ -46,7 +47,7 @@ Examples
 ```yaml
 # Task configuration level
 entry:
-  service: '@CleverAge\ProcessBundle\Task\File\Csv\CsvReaderTask'
+  task: csv_reader
   options:
     file_path: '%kernel.project_dir%/var/data/sample.csv'
     delimiter: '{{ delimiter }}'
@@ -58,7 +59,7 @@ entry:
 ```yaml
 # Task configuration level
 entry:
-  service: '@CleverAge\ProcessBundle\Task\File\Csv\CsvReaderTask'
+  task: csv_reader
   options:
     file_path: '%kernel.project_dir%/var/data/no_header.csv'
     delimiter: ','
diff --git a/docs/reference/tasks/csv_splitter_task.md b/docs/reference/tasks/csv_splitter_task.md
index 322fa05f..328f0b47 100644
--- a/docs/reference/tasks/csv_splitter_task.md
+++ b/docs/reference/tasks/csv_splitter_task.md
@@ -8,6 +8,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\File\Csv\CsvSplitterTask`
+* **Code**: `csv_splitter` (`task: csv_splitter`)
 * **Iterable task**
 
 Accepted inputs
@@ -44,18 +45,18 @@ Examples
 ```yaml
 # Task configuration level
 entry:
-  service: '@CleverAge\ProcessBundle\Task\ConstantOutputTask'
+  task: constant_output
   options:
     output: '%kernel.project_dir%/var/data/large_file.csv'
   outputs: [split]
 split:
-  service: '@CleverAge\ProcessBundle\Task\File\Csv\CsvSplitterTask'
+  task: csv_splitter
   options:
     delimiter: ';'
     max_lines: 500
   outputs: [read_chunk]
 read_chunk:
-  service: '@CleverAge\ProcessBundle\Task\File\Csv\InputCsvReaderTask'
+  task: input_csv_reader
   options:
     delimiter: ';'
 ```
diff --git a/docs/reference/tasks/csv_writer_task.md b/docs/reference/tasks/csv_writer_task.md
index c4ffb382..83cb52d4 100644
--- a/docs/reference/tasks/csv_writer_task.md
+++ b/docs/reference/tasks/csv_writer_task.md
@@ -8,6 +8,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\File\Csv\CsvWriterTask`
+* **Code**: `csv_writer` (`task: csv_writer`)
 * **Blocking task**
 
 Accepted inputs
@@ -44,7 +45,7 @@ Examples
 ```yaml
 # Task configuration level
 entry:
-  service: '@CleverAge\ProcessBundle\Task\ConstantIterableOutputTask'
+  task: constant_iterable_output
   options:
     output:
       - column1: value1-1
@@ -53,7 +54,7 @@ entry:
         column2: value2-2
   outputs: [write]
 write:
-  service: '@CleverAge\ProcessBundle\Task\File\Csv\CsvWriterTask'
+  task: csv_writer
   options:
     file_path: '%kernel.project_dir%/var/data/csv_writer_{date_time}.csv'
 ```
@@ -63,7 +64,7 @@ write:
 ```yaml
 # Task configuration level
 write:
-  service: '@CleverAge\ProcessBundle\Task\File\Csv\CsvWriterTask'
+  task: csv_writer
   options:
     file_path: '%kernel.project_dir%/var/data/export.csv'
     mode: 'ab'
diff --git a/docs/reference/tasks/debug_task.md b/docs/reference/tasks/debug_task.md
index 9dfe0d24..9df162f4 100644
--- a/docs/reference/tasks/debug_task.md
+++ b/docs/reference/tasks/debug_task.md
@@ -8,6 +8,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\Debug\DebugTask`
+* **Code**: `debug` (`task: debug`)
 
 Accepted inputs
 ---------------
@@ -32,12 +33,12 @@ Examples
 ```yaml
 # Task configuration level
 entry:
-  service: '@CleverAge\ProcessBundle\Task\ConstantOutputTask'
+  task: constant_output
   options:
     output:
       id: 123
       firstname: Test1
   outputs: [debug]
 debug:
-  service: '@CleverAge\ProcessBundle\Task\Debug\DebugTask'
+  task: debug
 ```
diff --git a/docs/reference/tasks/denormalizer_task.md b/docs/reference/tasks/denormalizer_task.md
index 07436b77..317e5b3f 100644
--- a/docs/reference/tasks/denormalizer_task.md
+++ b/docs/reference/tasks/denormalizer_task.md
@@ -8,6 +8,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\Serialization\DenormalizerTask`
+* **Code**: `denormalizer` (`task: denormalizer`)
 
 Accepted inputs
 ---------------
@@ -37,7 +38,7 @@ Examples
 ```yaml
 # Task configuration level
 denormalize:
-  service: '@CleverAge\ProcessBundle\Task\Serialization\DenormalizerTask'
+  task: denormalizer
   options:
     class: App\Entity\Author
   outputs: [save]
@@ -48,7 +49,7 @@ denormalize:
 ```yaml
 # Task configuration level
 dto:
-  service: '@CleverAge\ProcessBundle\Task\Serialization\DenormalizerTask'
+  task: denormalizer
   options:
     class: 'App\Dto\Commune[]'
   outputs: [debug]
diff --git a/docs/reference/tasks/deserializer_task.md b/docs/reference/tasks/deserializer_task.md
index 051d337d..8161aef2 100644
--- a/docs/reference/tasks/deserializer_task.md
+++ b/docs/reference/tasks/deserializer_task.md
@@ -7,6 +7,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\Serialization\DeserializerTask`
+* **Code**: `deserializer` (`task: deserializer`)
 
 Accepted inputs
 ---------------
@@ -35,7 +36,7 @@ Examples
 ```yaml
 # Task configuration level
 deserialize:
-  service: '@CleverAge\ProcessBundle\Task\Serialization\DeserializerTask'
+  task: deserializer
   options:
     type: App\Entity\Author
     format: json
diff --git a/docs/reference/tasks/die_task.md b/docs/reference/tasks/die_task.md
index f11024fd..d81228c4 100644
--- a/docs/reference/tasks/die_task.md
+++ b/docs/reference/tasks/die_task.md
@@ -9,6 +9,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\Debug\DieTask`
+* **Code**: `die` (`task: die`)
 
 Accepted inputs
 ---------------
@@ -33,10 +34,10 @@ Examples
 ```yaml
 # Task configuration level
 entry:
-  service: '@CleverAge\ProcessBundle\Task\ConstantOutputTask'
+  task: constant_output
   options:
     output: { id: 123 }
   outputs: [die]
 die:
-  service: '@CleverAge\ProcessBundle\Task\Debug\DieTask'
+  task: die
 ```
diff --git a/docs/reference/tasks/dummy_task.md b/docs/reference/tasks/dummy_task.md
index e46ad30f..821dc914 100644
--- a/docs/reference/tasks/dummy_task.md
+++ b/docs/reference/tasks/dummy_task.md
@@ -8,6 +8,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\DummyTask`
+* **Code**: `dummy` (`task: dummy`)
 
 Accepted inputs
 ---------------
@@ -32,14 +33,14 @@ Examples
 ```yaml
 # Task configuration level
 entry:
-  service: '@CleverAge\ProcessBundle\Task\DummyTask'
+  task: dummy
   outputs: [output1, output2]
 output1:
-  service: '@CleverAge\ProcessBundle\Task\ConstantOutputTask'
+  task: constant_output
   options:
     output: { id: 123 }
 output2:
-  service: '@CleverAge\ProcessBundle\Task\ConstantOutputTask'
+  task: constant_output
   options:
     output: { id: 456 }
 ```
diff --git a/docs/reference/tasks/error_forwarder_task.md b/docs/reference/tasks/error_forwarder_task.md
index 895e63ef..4908c707 100644
--- a/docs/reference/tasks/error_forwarder_task.md
+++ b/docs/reference/tasks/error_forwarder_task.md
@@ -8,6 +8,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\Debug\ErrorForwarderTask`
+* **Code**: `error_forwarder` (`task: error_forwarder`)
 
 Accepted inputs
 ---------------
@@ -34,13 +35,13 @@ Examples
 ```yaml
 # Task configuration level
 entry:
-  service: '@CleverAge\ProcessBundle\Task\ConstantIterableOutputTask'
+  task: constant_iterable_output
   options:
     output: [Error 1, Error 2, Error 3]
   outputs: [error_forwarder]
 error_forwarder:
-  service: '@CleverAge\ProcessBundle\Task\Debug\ErrorForwarderTask'
+  task: error_forwarder
   error_outputs: [debug]
 debug:
-  service: '@CleverAge\ProcessBundle\Task\Debug\DebugTask'
+  task: debug
 ```
diff --git a/docs/reference/tasks/event_dispatcher_task.md b/docs/reference/tasks/event_dispatcher_task.md
index aedddbbc..3f1b8be9 100644
--- a/docs/reference/tasks/event_dispatcher_task.md
+++ b/docs/reference/tasks/event_dispatcher_task.md
@@ -9,6 +9,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\Event\EventDispatcherTask`
+* **Code**: `event_dispatcher` (`task: event_dispatcher`)
 
 Accepted inputs
 ---------------
@@ -37,12 +38,12 @@ Examples
 ```yaml
 # Task configuration level
 data:
-  service: '@CleverAge\ProcessBundle\Task\ConstantIterableOutputTask'
+  task: constant_iterable_output
   options:
     output: [1, 2, 3]
   outputs: [push_data_event]
 push_data_event:
-  service: '@CleverAge\ProcessBundle\Task\Event\EventDispatcherTask'
+  task: event_dispatcher
   options:
     event_name: myapp.data_queue
 ```
diff --git a/docs/reference/tasks/file_mover_task.md b/docs/reference/tasks/file_mover_task.md
index 95d20ed6..0f4fa5e4 100644
--- a/docs/reference/tasks/file_mover_task.md
+++ b/docs/reference/tasks/file_mover_task.md
@@ -8,6 +8,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\File\FileMoverTask`
+* **Code**: `file_mover` (`task: file_mover`)
 
 Accepted inputs
 ---------------
@@ -36,7 +37,7 @@ Examples
 ```yaml
 # Task configuration level
 move_file:
-  service: '@CleverAge\ProcessBundle\Task\File\FileMoverTask'
+  task: file_mover
   options:
     destination: '%kernel.project_dir%/var/data/archive/'
     autoincrement: true
diff --git a/docs/reference/tasks/file_reader_task.md b/docs/reference/tasks/file_reader_task.md
index b1a05e8f..f75e31c3 100644
--- a/docs/reference/tasks/file_reader_task.md
+++ b/docs/reference/tasks/file_reader_task.md
@@ -7,6 +7,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\File\FileReaderTask`
+* **Code**: `file_reader` (`task: file_reader`)
 
 Accepted inputs
 ---------------
@@ -32,7 +33,7 @@ Examples
 ```yaml
 # Task configuration level
 entry:
-  service: '@CleverAge\ProcessBundle\Task\File\FileReaderTask'
+  task: file_reader
   options:
     filename: '%kernel.project_dir%/var/data/sample.txt'
   outputs: [debug]
diff --git a/docs/reference/tasks/file_remover_task.md b/docs/reference/tasks/file_remover_task.md
index 4ee709e1..c61b8a2b 100644
--- a/docs/reference/tasks/file_remover_task.md
+++ b/docs/reference/tasks/file_remover_task.md
@@ -7,6 +7,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\File\FileRemoverTask`
+* **Code**: `file_remover` (`task: file_remover`)
 
 Accepted inputs
 ---------------
@@ -32,10 +33,10 @@ Examples
 ```yaml
 # Task configuration level
 entry:
-  service: '@CleverAge\ProcessBundle\Task\File\FolderBrowserTask'
+  task: folder_browser
   options:
     folder_path: '%kernel.project_dir%/var/tmp'
   outputs: [cleanup]
 cleanup:
-  service: '@CleverAge\ProcessBundle\Task\File\FileRemoverTask'
+  task: file_remover
 ```
diff --git a/docs/reference/tasks/file_splitter_task.md b/docs/reference/tasks/file_splitter_task.md
index a8881e0f..18282cf4 100644
--- a/docs/reference/tasks/file_splitter_task.md
+++ b/docs/reference/tasks/file_splitter_task.md
@@ -8,6 +8,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\File\FileSplitterTask`
+* **Code**: `file_splitter` (`task: file_splitter`)
 * **Iterable task**
 
 Accepted inputs
@@ -36,13 +37,13 @@ Examples
 ```yaml
 # Task configuration level
 entry:
-  service: '@CleverAge\ProcessBundle\Task\File\FileSplitterTask'
+  task: file_splitter
   options:
     file_path: '%kernel.project_dir%/var/data/json_stream_reader.json'
     max_lines: 100
   outputs: [read_chunk]
 read_chunk:
-  service: '@CleverAge\ProcessBundle\Task\File\InputLineReaderTask'
+  task: input_line_reader
 ```
 
 Notes
diff --git a/docs/reference/tasks/file_writer_task.md b/docs/reference/tasks/file_writer_task.md
index d66cf076..6b8b8c4d 100644
--- a/docs/reference/tasks/file_writer_task.md
+++ b/docs/reference/tasks/file_writer_task.md
@@ -7,6 +7,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\File\FileWriterTask`
+* **Code**: `file_writer` (`task: file_writer`)
 
 Accepted inputs
 ---------------
@@ -32,7 +33,7 @@ Examples
 ```yaml
 # Task configuration level
 write_file:
-  service: '@CleverAge\ProcessBundle\Task\File\FileWriterTask'
+  task: file_writer
   options:
     filename: '%kernel.project_dir%/var/data/result.txt'
 ```
diff --git a/docs/reference/tasks/filter_task.md b/docs/reference/tasks/filter_task.md
index ed1860a5..6b28bcc8 100644
--- a/docs/reference/tasks/filter_task.md
+++ b/docs/reference/tasks/filter_task.md
@@ -8,6 +8,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\FilterTask`
+* **Code**: `filter` (`task: filter`)
 
 Accepted inputs
 ---------------
@@ -45,7 +46,7 @@ Examples
 ```yaml
 # Task configuration level
 filter_active:
-  service: '@CleverAge\ProcessBundle\Task\FilterTask'
+  task: filter
   options:
     match:
       '[status]': active
diff --git a/docs/reference/tasks/folder_browser_task.md b/docs/reference/tasks/folder_browser_task.md
index 106299f9..8cdca1b0 100644
--- a/docs/reference/tasks/folder_browser_task.md
+++ b/docs/reference/tasks/folder_browser_task.md
@@ -8,6 +8,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\File\FolderBrowserTask`
+* **Code**: `folder_browser` (`task: folder_browser`)
 * **Iterable task**
 
 Accepted inputs
@@ -41,7 +42,7 @@ Examples
 ```yaml
 # Task configuration level
 entry:
-  service: '@CleverAge\ProcessBundle\Task\File\FolderBrowserTask'
+  task: folder_browser
   options:
     folder_path: '%kernel.project_dir%/var/data'
     name_pattern: '*.csv'
diff --git a/docs/reference/tasks/group_by_aggregate_iterable_task.md b/docs/reference/tasks/group_by_aggregate_iterable_task.md
index a66701f2..9a37b7cb 100644
--- a/docs/reference/tasks/group_by_aggregate_iterable_task.md
+++ b/docs/reference/tasks/group_by_aggregate_iterable_task.md
@@ -9,6 +9,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\GroupByAggregateIterableTask`
+* **Code**: `group_by_aggregate_iterable` (`task: group_by_aggregate_iterable`)
 * **Blocking task**
 
 Accepted inputs
@@ -38,7 +39,7 @@ Examples
 ```yaml
 # Task configuration level
 deduplicate:
-  service: '@CleverAge\ProcessBundle\Task\GroupByAggregateIterableTask'
+  task: group_by_aggregate_iterable
   options:
     group_by_accessors:
       - '[type]'
diff --git a/docs/reference/tasks/input_aggregator_task.md b/docs/reference/tasks/input_aggregator_task.md
index 103529dd..2ade9256 100644
--- a/docs/reference/tasks/input_aggregator_task.md
+++ b/docs/reference/tasks/input_aggregator_task.md
@@ -11,6 +11,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\InputAggregatorTask`
+* **Code**: `input_aggregator` (`task: input_aggregator`)
 
 Accepted inputs
 ---------------
@@ -40,20 +41,20 @@ Examples
 ```yaml
 # Task configuration level
 entry:
-  service: '@CleverAge\ProcessBundle\Task\DummyTask'
+  task: dummy
   outputs: [branch_a, branch_b]
 branch_a:
-  service: '@CleverAge\ProcessBundle\Task\ConstantOutputTask'
+  task: constant_output
   options:
     output: A
   outputs: [aggregate]
 branch_b:
-  service: '@CleverAge\ProcessBundle\Task\ConstantOutputTask'
+  task: constant_output
   options:
     output: B
   outputs: [aggregate]
 aggregate:
-  service: '@CleverAge\ProcessBundle\Task\InputAggregatorTask'
+  task: input_aggregator
   options:
     input_codes:
       branch_a: a
diff --git a/docs/reference/tasks/input_csv_reader_task.md b/docs/reference/tasks/input_csv_reader_task.md
index 67a636e8..fed3844b 100644
--- a/docs/reference/tasks/input_csv_reader_task.md
+++ b/docs/reference/tasks/input_csv_reader_task.md
@@ -8,6 +8,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\File\Csv\InputCsvReaderTask`
+* **Code**: `input_csv_reader` (`task: input_csv_reader`)
 * **Iterable task**
 
 Accepted inputs
@@ -49,13 +50,13 @@ Examples
 ```yaml
 # Task configuration level
 entry:
-  service: '@CleverAge\ProcessBundle\Task\File\FolderBrowserTask'
+  task: folder_browser
   options:
     folder_path: '%kernel.project_dir%/var/data'
     name_pattern: '*.csv'
   outputs: [read]
 read:
-  service: '@CleverAge\ProcessBundle\Task\File\Csv\InputCsvReaderTask'
+  task: input_csv_reader
   outputs: [dump]
 ```
 
@@ -65,7 +66,7 @@ read:
 ```yaml
 # Task configuration level
 read:
-  service: '@CleverAge\ProcessBundle\Task\File\Csv\InputCsvReaderTask'
+  task: input_csv_reader
   options:
     delimiter: '{{ delimiter }}'
   outputs: [dump]
diff --git a/docs/reference/tasks/input_file_reader_task.md b/docs/reference/tasks/input_file_reader_task.md
index ac9413f9..e06754b5 100644
--- a/docs/reference/tasks/input_file_reader_task.md
+++ b/docs/reference/tasks/input_file_reader_task.md
@@ -8,6 +8,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\File\InputFileReaderTask`
+* **Code**: `input_file_reader` (`task: input_file_reader`)
 
 Accepted inputs
 ---------------
@@ -34,11 +35,11 @@ Examples
 ```yaml
 # Task configuration level
 entry:
-  service: '@CleverAge\ProcessBundle\Task\File\FolderBrowserTask'
+  task: folder_browser
   options:
     folder_path: '%kernel.project_dir%/var/data'
   outputs: [read]
 read:
-  service: '@CleverAge\ProcessBundle\Task\File\InputFileReaderTask'
+  task: input_file_reader
   outputs: [debug]
 ```
diff --git a/docs/reference/tasks/input_folder_browser_task.md b/docs/reference/tasks/input_folder_browser_task.md
index 9d21bddc..c8126305 100644
--- a/docs/reference/tasks/input_folder_browser_task.md
+++ b/docs/reference/tasks/input_folder_browser_task.md
@@ -8,6 +8,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\File\InputFolderBrowserTask`
+* **Code**: `input_folder_browser` (`task: input_folder_browser`)
 * **Iterable task**
 * **Flushable task**
 
@@ -48,15 +49,15 @@ Examples
 ```yaml
 # Task configuration level
 entry:
-  service: '@CleverAge\ProcessBundle\Task\ConstantOutputTask'
+  task: constant_output
   options:
     output: '/var/data'
   outputs: [directory]
 directory:
-  service: '@CleverAge\ProcessBundle\Task\File\InputFolderBrowserTask'
+  task: input_folder_browser
   options:
     base_folder_path: '%kernel.project_dir%'
   outputs: [read]
 read:
-  service: '@CleverAge\ProcessBundle\Task\File\InputFileReaderTask'
+  task: input_file_reader
 ```
diff --git a/docs/reference/tasks/input_iterator_task.md b/docs/reference/tasks/input_iterator_task.md
index 2d4407ce..37cd862f 100644
--- a/docs/reference/tasks/input_iterator_task.md
+++ b/docs/reference/tasks/input_iterator_task.md
@@ -7,6 +7,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\InputIteratorTask`
+* **Code**: `input_iterator` (`task: input_iterator`)
 * **Iterable task**
 
 Accepted inputs
@@ -32,9 +33,9 @@ Examples
 ```yaml
 # Task configuration level
 aggregate:
-  service: '@CleverAge\ProcessBundle\Task\AggregateIterableTask'
+  task: aggregate_iterable
   outputs: [iterate]
 iterate:
-  service: '@CleverAge\ProcessBundle\Task\InputIteratorTask'
+  task: input_iterator
   outputs: [next_task]
 ```
diff --git a/docs/reference/tasks/input_line_reader_task.md b/docs/reference/tasks/input_line_reader_task.md
index a3605beb..682eff9f 100644
--- a/docs/reference/tasks/input_line_reader_task.md
+++ b/docs/reference/tasks/input_line_reader_task.md
@@ -8,6 +8,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\File\InputLineReaderTask`
+* **Code**: `input_line_reader` (`task: input_line_reader`)
 * **Iterable task**
 
 Accepted inputs
@@ -37,11 +38,11 @@ Examples
 ```yaml
 # Task configuration level
 entry:
-  service: '@CleverAge\ProcessBundle\Task\File\FolderBrowserTask'
+  task: folder_browser
   options:
     folder_path: '%kernel.project_dir%/var/data'
   outputs: [read]
 read:
-  service: '@CleverAge\ProcessBundle\Task\File\InputLineReaderTask'
+  task: input_line_reader
   outputs: [log_line]
 ```
diff --git a/docs/reference/tasks/iterable_batch_task.md b/docs/reference/tasks/iterable_batch_task.md
index 0762c9e0..2538923d 100644
--- a/docs/reference/tasks/iterable_batch_task.md
+++ b/docs/reference/tasks/iterable_batch_task.md
@@ -10,6 +10,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\IterableBatchTask`
+* **Code**: `iterable_batch` (`task: iterable_batch`)
 * **Iterable task**
 * **Flushable task**
 
@@ -38,10 +39,10 @@ Examples
 ```yaml
 # Task configuration level
 iterator:
-  service: '@CleverAge\ProcessBundle\Task\InputIteratorTask'
+  task: input_iterator
   outputs: [batch]
 batch:
-  service: '@CleverAge\ProcessBundle\Task\IterableBatchTask'
+  task: iterable_batch
   options:
     batch_count: 2
   outputs: [next_task]
diff --git a/docs/reference/tasks/json_stream_reader_task.md b/docs/reference/tasks/json_stream_reader_task.md
index 76871dc2..b61db0ed 100644
--- a/docs/reference/tasks/json_stream_reader_task.md
+++ b/docs/reference/tasks/json_stream_reader_task.md
@@ -8,6 +8,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\File\JsonStream\JsonStreamReaderTask`
+* **Code**: `json_stream_reader` (`task: json_stream_reader`)
 * **Iterable task**
 
 Accepted inputs
@@ -40,12 +41,12 @@ Examples
 ```yaml
 # Task configuration level
 entry:
-  service: '@CleverAge\ProcessBundle\Task\ConstantOutputTask'
+  task: constant_output
   options:
     output: '%kernel.project_dir%/var/data/json_stream_reader.json'
   outputs: [read]
 read:
-  service: '@CleverAge\ProcessBundle\Task\File\JsonStream\JsonStreamReaderTask'
+  task: json_stream_reader
   options:
     json_flags:
       - !php/const JSON_THROW_ON_ERROR
diff --git a/docs/reference/tasks/json_stream_writer_task.md b/docs/reference/tasks/json_stream_writer_task.md
index 21b1150e..ffcc5c17 100644
--- a/docs/reference/tasks/json_stream_writer_task.md
+++ b/docs/reference/tasks/json_stream_writer_task.md
@@ -8,6 +8,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\File\JsonStream\JsonStreamWriterTask`
+* **Code**: `json_stream_writer` (`task: json_stream_writer`)
 * **Blocking task**
 
 Accepted inputs
@@ -37,7 +38,7 @@ Examples
 ```yaml
 # Task configuration level
 entry:
-  service: '@CleverAge\ProcessBundle\Task\ConstantIterableOutputTask'
+  task: constant_iterable_output
   options:
     output:
       - column1: value1-1
@@ -46,7 +47,7 @@ entry:
         column2: value2-2
   outputs: [write]
 write:
-  service: '@CleverAge\ProcessBundle\Task\File\JsonStream\JsonStreamWriterTask'
+  task: json_stream_writer
   options:
     file_path: '%kernel.project_dir%/var/data/json_stream_writer_{date_time}.json'
     json_flags:
diff --git a/docs/reference/tasks/line_reader_task.md b/docs/reference/tasks/line_reader_task.md
index 702690b8..a9bb8d69 100644
--- a/docs/reference/tasks/line_reader_task.md
+++ b/docs/reference/tasks/line_reader_task.md
@@ -7,6 +7,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\File\LineReaderTask`
+* **Code**: `line_reader` (`task: line_reader`)
 * **Iterable task**
 
 Accepted inputs
@@ -36,12 +37,12 @@ Examples
 ```yaml
 # Task configuration level
 entry:
-  service: '@CleverAge\ProcessBundle\Task\File\LineReaderTask'
+  task: line_reader
   options:
     filename: '%kernel.project_dir%/var/data/sample.txt'
   outputs: [trim]
 trim:
-  service: '@CleverAge\ProcessBundle\Task\TransformerTask'
+  task: transformer
   options:
     transformers:
       trim: ~
diff --git a/docs/reference/tasks/logger_task.md b/docs/reference/tasks/logger_task.md
index 814346b7..dcd1b38d 100644
--- a/docs/reference/tasks/logger_task.md
+++ b/docs/reference/tasks/logger_task.md
@@ -7,6 +7,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\Reporting\LoggerTask`
+* **Code**: `logger` (`task: logger`)
 
 Accepted inputs
 ---------------
@@ -36,7 +37,7 @@ Examples
 ```yaml
 # Task configuration level
 log:
-  service: '@CleverAge\ProcessBundle\Task\Reporting\LoggerTask'
+  task: logger
   options:
     level: warning
     message: DEMO LOGGER
@@ -48,7 +49,7 @@ log:
 ```yaml
 # Task configuration level
 log:
-  service: '@CleverAge\ProcessBundle\Task\Reporting\LoggerTask'
+  task: logger
   options:
     level: info
     message: Transformed
diff --git a/docs/reference/tasks/normalizer_task.md b/docs/reference/tasks/normalizer_task.md
index 988d8b6e..a07639dd 100644
--- a/docs/reference/tasks/normalizer_task.md
+++ b/docs/reference/tasks/normalizer_task.md
@@ -7,6 +7,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\Serialization\NormalizerTask`
+* **Code**: `normalizer` (`task: normalizer`)
 
 Accepted inputs
 ---------------
@@ -35,7 +36,7 @@ Examples
 ```yaml
 # Task configuration level
 normalize:
-  service: '@CleverAge\ProcessBundle\Task\Serialization\NormalizerTask'
+  task: normalizer
   options:
     format: json
     context:
diff --git a/docs/reference/tasks/object_updater_task.md b/docs/reference/tasks/object_updater_task.md
index 537215af..b636c6cb 100644
--- a/docs/reference/tasks/object_updater_task.md
+++ b/docs/reference/tasks/object_updater_task.md
@@ -8,6 +8,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\ObjectUpdaterTask`
+* **Code**: `object_updater` (`task: object_updater`)
 
 Accepted inputs
 ---------------
@@ -39,7 +40,7 @@ Examples
 ```yaml
 # Task configuration level
 update_object:
-  service: '@CleverAge\ProcessBundle\Task\ObjectUpdaterTask'
+  task: object_updater
   options:
     property_path: name
   outputs: [save]
diff --git a/docs/reference/tasks/process_executor_task.md b/docs/reference/tasks/process_executor_task.md
index a7a5517f..5cfdfc98 100644
--- a/docs/reference/tasks/process_executor_task.md
+++ b/docs/reference/tasks/process_executor_task.md
@@ -9,6 +9,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\Process\ProcessExecutorTask`
+* **Code**: `process_executor` (`task: process_executor`)
 
 Accepted inputs
 ---------------
@@ -36,7 +37,7 @@ Examples
 ```yaml
 # Task configuration level
 run_subprocess:
-  service: '@CleverAge\ProcessBundle\Task\Process\ProcessExecutorTask'
+  task: process_executor
   options:
     process: app.import_product
     context:
diff --git a/docs/reference/tasks/process_launcher_task.md b/docs/reference/tasks/process_launcher_task.md
index cee6919b..228e0081 100644
--- a/docs/reference/tasks/process_launcher_task.md
+++ b/docs/reference/tasks/process_launcher_task.md
@@ -9,6 +9,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\Process\ProcessLauncherTask`
+* **Code**: `process_launcher` (`task: process_launcher`)
 * **Iterable task**
 * **Flushable task**
 
@@ -51,7 +52,7 @@ Examples
 ```yaml
 # Task configuration level
 parallel_import:
-  service: '@CleverAge\ProcessBundle\Task\Process\ProcessLauncherTask'
+  task: process_launcher
   options:
     process: app.import_file
     max_processes: 5
diff --git a/docs/reference/tasks/property_getter_task.md b/docs/reference/tasks/property_getter_task.md
index a24ca1b4..4d19387b 100644
--- a/docs/reference/tasks/property_getter_task.md
+++ b/docs/reference/tasks/property_getter_task.md
@@ -10,6 +10,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\PropertyGetterTask`
+* **Code**: `property_getter` (`task: property_getter`)
 
 Accepted inputs
 ---------------
@@ -39,7 +40,7 @@ Examples
 ```yaml
 # Task configuration level
 get_file_path:
-  service: '@CleverAge\ProcessBundle\Task\PropertyGetterTask'
+  task: property_getter
   options:
     property: 'path'
   outputs: [remove_input]
@@ -50,7 +51,7 @@ get_file_path:
 ```yaml
 # Task configuration level
 get_sku:
-  service: '@CleverAge\ProcessBundle\Task\PropertyGetterTask'
+  task: property_getter
   options:
     property: '[sku]'
   outputs: [next_task]
diff --git a/docs/reference/tasks/property_setter_task.md b/docs/reference/tasks/property_setter_task.md
index 1fcc7c83..31568bd4 100644
--- a/docs/reference/tasks/property_setter_task.md
+++ b/docs/reference/tasks/property_setter_task.md
@@ -10,6 +10,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\PropertySetterTask`
+* **Code**: `property_setter` (`task: property_setter`)
 
 Accepted inputs
 ---------------
@@ -40,7 +41,7 @@ Examples
 ```yaml
 # Task configuration level
 modify:
-  service: '@CleverAge\ProcessBundle\Task\PropertySetterTask'
+  task: property_setter
   options:
     values:
       firstname: Gérard
@@ -52,7 +53,7 @@ modify:
 ```yaml
 # Task configuration level
 set_defaults:
-  service: '@CleverAge\ProcessBundle\Task\PropertySetterTask'
+  task: property_setter
   options:
     values:
       '[status]': imported
diff --git a/docs/reference/tasks/row_aggregator_task.md b/docs/reference/tasks/row_aggregator_task.md
index ecd675b1..dc2071f6 100644
--- a/docs/reference/tasks/row_aggregator_task.md
+++ b/docs/reference/tasks/row_aggregator_task.md
@@ -9,6 +9,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\RowAggregatorTask`
+* **Code**: `row_aggregator` (`task: row_aggregator`)
 * **Blocking task**
 
 Accepted inputs
@@ -39,7 +40,7 @@ Examples
 ```yaml
 # Task configuration level
 aggregate_rows:
-  service: '@CleverAge\ProcessBundle\Task\RowAggregatorTask'
+  task: row_aggregator
   options:
     aggregate_by: order_id
     aggregate_columns: [product, qty]
diff --git a/docs/reference/tasks/serializer_task.md b/docs/reference/tasks/serializer_task.md
index aa589256..7de1712f 100644
--- a/docs/reference/tasks/serializer_task.md
+++ b/docs/reference/tasks/serializer_task.md
@@ -7,6 +7,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\Serialization\SerializerTask`
+* **Code**: `serializer` (`task: serializer`)
 
 Accepted inputs
 ---------------
@@ -34,7 +35,7 @@ Examples
 ```yaml
 # Task configuration level
 serialize:
-  service: '@CleverAge\ProcessBundle\Task\Serialization\SerializerTask'
+  task: serializer
   options:
     format: json
     context:
diff --git a/docs/reference/tasks/simple_batch_task.md b/docs/reference/tasks/simple_batch_task.md
index 4602a73b..f0677bdc 100644
--- a/docs/reference/tasks/simple_batch_task.md
+++ b/docs/reference/tasks/simple_batch_task.md
@@ -8,6 +8,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\SimpleBatchTask`
+* **Code**: `simple_batch` (`task: simple_batch`)
 * **Flushable task**
 
 Accepted inputs
@@ -36,12 +37,12 @@ Examples
 ```yaml
 # Task configuration level
 data:
-  service: '@CleverAge\ProcessBundle\Task\ConstantIterableOutputTask'
+  task: constant_iterable_output
   options:
     output: [1, 2, 3]
   outputs: [batch]
 batch:
-  service: '@CleverAge\ProcessBundle\Task\SimpleBatchTask'
+  task: simple_batch
   options:
     batch_count: 2
   outputs: [next_task]
diff --git a/docs/reference/tasks/skip_empty_task.md b/docs/reference/tasks/skip_empty_task.md
index 6003c3e2..95d11061 100644
--- a/docs/reference/tasks/skip_empty_task.md
+++ b/docs/reference/tasks/skip_empty_task.md
@@ -8,6 +8,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\SkipEmptyTask`
+* **Code**: `skip_empty` (`task: skip_empty`)
 
 Accepted inputs
 ---------------
@@ -32,9 +33,9 @@ Examples
 ```yaml
 # Task configuration level
 merge:
-  service: '@CleverAge\ProcessBundle\Task\ArrayMergeTask'
+  task: array_merge
   outputs: [skip_if_empty]
 skip_if_empty:
-  service: '@CleverAge\ProcessBundle\Task\SkipEmptyTask'
+  task: skip_empty
   outputs: [next_task]
 ```
diff --git a/docs/reference/tasks/split_join_line_task.md b/docs/reference/tasks/split_join_line_task.md
index 712c62cf..eebda605 100644
--- a/docs/reference/tasks/split_join_line_task.md
+++ b/docs/reference/tasks/split_join_line_task.md
@@ -8,6 +8,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\SplitJoinLineTask`
+* **Code**: `split_join_line` (`task: split_join_line`)
 * **Iterable task**
 
 Accepted inputs
@@ -39,7 +40,7 @@ Examples
 ```yaml
 # Task configuration level
 split_line:
-  service: '@CleverAge\ProcessBundle\Task\SplitJoinLineTask'
+  task: split_join_line
   options:
     split_columns: [category, tag]
     join_column: value
diff --git a/docs/reference/tasks/stat_counter_task.md b/docs/reference/tasks/stat_counter_task.md
index 712deff0..70b002f3 100644
--- a/docs/reference/tasks/stat_counter_task.md
+++ b/docs/reference/tasks/stat_counter_task.md
@@ -8,6 +8,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\Reporting\StatCounterTask`
+* **Code**: `stat_counter` (`task: stat_counter`)
 
 Accepted inputs
 ---------------
@@ -34,5 +35,5 @@ Examples
 ```yaml
 # Task configuration level
 count:
-  service: '@CleverAge\ProcessBundle\Task\Reporting\StatCounterTask'
+  task: stat_counter
 ```
diff --git a/docs/reference/tasks/stop_task.md b/docs/reference/tasks/stop_task.md
index 1cb9bd5c..65ff7474 100644
--- a/docs/reference/tasks/stop_task.md
+++ b/docs/reference/tasks/stop_task.md
@@ -9,6 +9,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\StopTask`
+* **Code**: `stop` (`task: stop`)
 
 Accepted inputs
 ---------------
@@ -33,9 +34,9 @@ Examples
 ```yaml
 # Task configuration level
 validate:
-  service: '@CleverAge\ProcessBundle\Task\Validation\ValidatorTask'
+  task: validator
   error_strategy: skip
   error_outputs: [abort]
 abort:
-  service: '@CleverAge\ProcessBundle\Task\StopTask'
+  task: stop
 ```
diff --git a/docs/reference/tasks/stopwatch_task.md b/docs/reference/tasks/stopwatch_task.md
index 05728a2e..764ef9d3 100644
--- a/docs/reference/tasks/stopwatch_task.md
+++ b/docs/reference/tasks/stopwatch_task.md
@@ -8,6 +8,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\Debug\StopwatchTask`
+* **Code**: `stopwatch` (`task: stopwatch`)
 
 Accepted inputs
 ---------------
@@ -32,5 +33,5 @@ Examples
 ```yaml
 # Task configuration level
 stopwatch:
-  service: '@CleverAge\ProcessBundle\Task\Debug\StopwatchTask'
+  task: stopwatch
 ```
diff --git a/docs/reference/tasks/transformer_task.md b/docs/reference/tasks/transformer_task.md
index 5f9f1721..199d5f06 100644
--- a/docs/reference/tasks/transformer_task.md
+++ b/docs/reference/tasks/transformer_task.md
@@ -8,6 +8,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\TransformerTask`
+* **Code**: `transformer` (`task: transformer`)
 
 Accepted inputs
 ---------------
@@ -37,7 +38,7 @@ Examples
 ```yaml
 # Task configuration level
 json_decode:
-  service: '@CleverAge\ProcessBundle\Task\TransformerTask'
+  task: transformer
   options:
     transformers:
       callback:
@@ -51,7 +52,7 @@ json_decode:
 ```yaml
 # Task configuration level
 transform:
-  service: '@CleverAge\ProcessBundle\Task\TransformerTask'
+  task: transformer
   options:
     transformers:
       mapping:
@@ -72,7 +73,7 @@ transform:
 ```yaml
 # Task configuration level
 transform:
-  service: '@CleverAge\ProcessBundle\Task\TransformerTask'
+  task: transformer
   options:
     transformers:
       - mapping:
diff --git a/docs/reference/tasks/validator_task.md b/docs/reference/tasks/validator_task.md
index c3a43a1a..edc537dd 100644
--- a/docs/reference/tasks/validator_task.md
+++ b/docs/reference/tasks/validator_task.md
@@ -7,6 +7,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\Validation\ValidatorTask`
+* **Code**: `validator` (`task: validator`)
 
 Accepted inputs
 ---------------
@@ -48,7 +49,7 @@ Examples
 ```yaml
 # Task configuration level
 validate:
-  service: '@CleverAge\ProcessBundle\Task\Validation\ValidatorTask'
+  task: validator
   options:
     groups: [import]
   outputs: [save]
@@ -59,7 +60,7 @@ validate:
 ```yaml
 # Task configuration level
 validate:
-  service: '@CleverAge\ProcessBundle\Task\Validation\ValidatorTask'
+  task: validator
   options:
     log_errors: warning
     error_output_violations: true
diff --git a/docs/reference/tasks/xml_reader_task.md b/docs/reference/tasks/xml_reader_task.md
index 0537296e..ce1324c1 100644
--- a/docs/reference/tasks/xml_reader_task.md
+++ b/docs/reference/tasks/xml_reader_task.md
@@ -8,6 +8,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\File\Xml\XmlReaderTask`
+* **Code**: `xml_reader` (`task: xml_reader`)
 
 Accepted inputs
 ---------------
@@ -34,7 +35,7 @@ Examples
 ```yaml
 # Task configuration level
 read_xml:
-  service: '@CleverAge\ProcessBundle\Task\File\Xml\XmlReaderTask'
+  task: xml_reader
   options:
     file_path: '%kernel.project_dir%/var/data/file.xml'
   outputs: [transform]
diff --git a/docs/reference/tasks/xml_stream_reader_task.md b/docs/reference/tasks/xml_stream_reader_task.md
index f818ee28..810eef1b 100644
--- a/docs/reference/tasks/xml_stream_reader_task.md
+++ b/docs/reference/tasks/xml_stream_reader_task.md
@@ -11,6 +11,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\File\Xml\XmlStreamReaderTask`
+* **Code**: `xml_stream_reader` (`task: xml_stream_reader`)
 * **Iterable task**
 
 Accepted inputs
@@ -42,13 +43,13 @@ Examples
 ```yaml
 # Task configuration level
 read:
-  service: '@CleverAge\ProcessBundle\Task\File\Xml\XmlStreamReaderTask'
+  task: xml_stream_reader
   options:
     file_path: '%kernel.project_dir%/var/data/products.xml'
     node_name: product
   outputs: [transform]
 transform:
-  service: '@CleverAge\ProcessBundle\Task\TransformerTask'
+  task: transformer
   options:
     transformers:
       xpath_evaluator:
diff --git a/docs/reference/tasks/xml_writer_task.md b/docs/reference/tasks/xml_writer_task.md
index 8064ed57..9da713a2 100644
--- a/docs/reference/tasks/xml_writer_task.md
+++ b/docs/reference/tasks/xml_writer_task.md
@@ -8,6 +8,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\File\Xml\XmlWriterTask`
+* **Code**: `xml_writer` (`task: xml_writer`)
 
 Accepted inputs
 ---------------
@@ -34,7 +35,7 @@ Examples
 ```yaml
 # Task configuration level
 write_xml:
-  service: '@CleverAge\ProcessBundle\Task\File\Xml\XmlWriterTask'
+  task: xml_writer
   options:
     file_path: '%kernel.project_dir%/var/data/file.xml'
 ```
diff --git a/docs/reference/tasks/yaml_reader_task.md b/docs/reference/tasks/yaml_reader_task.md
index c08f4e21..56bd85a8 100644
--- a/docs/reference/tasks/yaml_reader_task.md
+++ b/docs/reference/tasks/yaml_reader_task.md
@@ -7,6 +7,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\File\Yaml\YamlReaderTask`
+* **Code**: `yaml_reader` (`task: yaml_reader`)
 * **Iterable task**
 
 Accepted inputs
@@ -33,7 +34,7 @@ Examples
 ```yaml
 # Task configuration level
 read_yaml:
-  service: '@CleverAge\ProcessBundle\Task\File\Yaml\YamlReaderTask'
+  task: yaml_reader
   options:
     file_path: '%kernel.project_dir%/var/data/data.yaml'
   outputs: [process_item]
diff --git a/docs/reference/tasks/yaml_writer_task.md b/docs/reference/tasks/yaml_writer_task.md
index c3e6f122..9b0a3c38 100644
--- a/docs/reference/tasks/yaml_writer_task.md
+++ b/docs/reference/tasks/yaml_writer_task.md
@@ -7,6 +7,7 @@ Task reference
 --------------
 
 * **Service**: `CleverAge\ProcessBundle\Task\File\Yaml\YamlWriterTask`
+* **Code**: `yaml_writer` (`task: yaml_writer`)
 
 Accepted inputs
 ---------------
@@ -32,7 +33,7 @@ Examples
 ```yaml
 # Task configuration level
 write_yaml:
-  service: '@CleverAge\ProcessBundle\Task\File\Yaml\YamlWriterTask'
+  task: yaml_writer
   options:
     file_path: '%kernel.project_dir%/var/data/export.yaml'
     inline: 3
diff --git a/src/Attribute/AsTask.php b/src/Attribute/AsTask.php
new file mode 100644
index 00000000..bd0ad219
--- /dev/null
+++ b/src/Attribute/AsTask.php
@@ -0,0 +1,30 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the CleverAge/ProcessBundle package.
+ *
+ * Copyright (c) Clever-Age
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace CleverAge\ProcessBundle\Attribute;
+
+/**
+ * Gives a code to a task service, to reference it with the `task` key of a task configuration (`task: <code>`)
+ * instead of its service id or class name (`service: '@<id>'`).
+ *
+ * Requires autoconfiguration; equivalent to a `cleverage.task` tag with a `code` attribute. The code is unique: two task
+ * services with the same code fail the container compilation (use a prefix for the application tasks).
+ */
+#[\Attribute(\Attribute::TARGET_CLASS)]
+final readonly class AsTask
+{
+    public function __construct(
+        public string $code,
+    ) {
+    }
+}
diff --git a/src/DependencyInjection/CleverAgeProcessExtension.php b/src/DependencyInjection/CleverAgeProcessExtension.php
index c51b6c31..4045cfbc 100644
--- a/src/DependencyInjection/CleverAgeProcessExtension.php
+++ b/src/DependencyInjection/CleverAgeProcessExtension.php
@@ -13,6 +13,7 @@
 
 namespace CleverAge\ProcessBundle\DependencyInjection;
 
+use CleverAge\ProcessBundle\Attribute\AsTask;
 use CleverAge\ProcessBundle\Attribute\AsTransformer;
 use CleverAge\ProcessBundle\Model\ProcessStopCheckerInterface;
 use CleverAge\ProcessBundle\Model\TaskInterface;
@@ -48,6 +49,13 @@ public function load(array $configs, ContainerBuilder $container): void
         $container->registerForAutoconfiguration(TransformerInterface::class)
             ->addTag('cleverage.transformer')
             ->addTag('monolog.logger', ['channel' => 'cleverage_process_transformer']);
+        // Tasks referenced by code (task: <code>)
+        $container->registerAttributeForAutoconfiguration(
+            AsTask::class,
+            static function (ChildDefinition $definition, AsTask $attribute): void {
+                $definition->addTag('cleverage.task', ['code' => $attribute->code]);
+            }
+        );
         // Lazy loading of the transformers by code
         $container->registerAttributeForAutoconfiguration(
             AsTransformer::class,
diff --git a/src/DependencyInjection/Compiler/TaskLocatorCompilerPass.php b/src/DependencyInjection/Compiler/TaskLocatorCompilerPass.php
index 0e8cef9b..aa8fa2ab 100644
--- a/src/DependencyInjection/Compiler/TaskLocatorCompilerPass.php
+++ b/src/DependencyInjection/Compiler/TaskLocatorCompilerPass.php
@@ -16,11 +16,13 @@
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
 use Symfony\Component\DependencyInjection\Compiler\ServiceLocatorTagPass;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
 use Symfony\Component\DependencyInjection\Reference;
 
 /**
  * Builds the service locator of the task registry from the services referenced by the process configurations, so
- * that the tasks are not fetched from the whole service container.
+ * that the tasks are not fetched from the whole service container. The `task` codes of the configurations are first
+ * resolved into the service with this code (`cleverage.task` tag, `#[AsTask]`).
  *
  * @internal
  */
@@ -32,10 +34,13 @@ public function process(ContainerBuilder $container): void
             || !$container->hasDefinition('cleverage_process.registry.process_configuration')) {
             return;
         }
-
-        $configurations = $container->getParameterBag()->resolveValue(
-            $container->getDefinition('cleverage_process.registry.process_configuration')->getArgument(0)
+        $processConfigurationRegistry = $container->getDefinition('cleverage_process.registry.process_configuration');
+        $processConfigurationRegistry->replaceArgument(
+            0,
+            $this->resolveTaskCodes($container, $processConfigurationRegistry->getArgument(0))
         );
+
+        $configurations = $container->getParameterBag()->resolveValue($processConfigurationRegistry->getArgument(0));
         $services = [];
         foreach (\is_array($configurations) ? $configurations : [] as $configuration) {
             foreach ($configuration['tasks'] ?? [] as $task) {
@@ -50,4 +55,55 @@ public function process(ContainerBuilder $container): void
         $container->getDefinition('cleverage_process.registry.task')
             ->replaceArgument(0, ServiceLocatorTagPass::register($container, $services));
     }
+
+    /**
+     * Sets the "service" of the tasks configured with a "task" code. The configurations are not resolved (parameters),
+     * only the "service" key is set.
+     */
+    private function resolveTaskCodes(ContainerBuilder $container, mixed $configurations): mixed
+    {
+        if (!\is_array($configurations)) {
+            return $configurations;
+        }
+        $codes = null;
+        foreach ($configurations as $processCode => $configuration) {
+            foreach ($configuration['tasks'] ?? [] as $taskCode => $task) {
+                if (null === ($task['task'] ?? null)) {
+                    continue;
+                }
+                $codes ??= $this->getTaskCodes($container);
+                $code = $container->getParameterBag()->resolveValue($task['task']);
+                if (!\is_string($code) || !isset($codes[$code])) {
+                    $known = array_keys($codes);
+                    sort($known);
+                    throw new InvalidArgumentException(\sprintf('Unknown task code "%s" for the task "%s" of the process "%s". Known codes: "%s".', \is_string($code) ? $code : get_debug_type($code), $taskCode, $processCode, implode('", "', $known)));
+                }
+                $configurations[$processCode]['tasks'][$taskCode]['service'] = '@'.$codes[$code];
+            }
+        }
+
+        return $configurations;
+    }
+
+    /**
+     * @return array<string, string> service id by task code
+     */
+    private function getTaskCodes(ContainerBuilder $container): array
+    {
+        $codes = [];
+        foreach ($container->findTaggedServiceIds('cleverage.task') as $id => $tags) {
+            foreach ($tags as $attributes) {
+                $code = $attributes['code'] ?? null;
+                if (!\is_string($code) || '' === $code) {
+                    throw new InvalidArgumentException(\sprintf('The "code" attribute of the "cleverage.task" tag of the "%s" service must be a non-empty string.', $id));
+                }
+                if (isset($codes[$code]) && $codes[$code] !== $id) {
+                    throw new InvalidArgumentException(\sprintf('The task code "%s" is used by the "%s" and "%s" services.', $code, $codes[$code], $id));
+                }
+                $codes[$code] = $id;
+            }
+        }
+
+        return $codes;
+    }
 }
diff --git a/src/DependencyInjection/Compiler/UnavailableServicesCompilerPass.php b/src/DependencyInjection/Compiler/UnavailableServicesCompilerPass.php
index b3162e22..dbb9f0ec 100644
--- a/src/DependencyInjection/Compiler/UnavailableServicesCompilerPass.php
+++ b/src/DependencyInjection/Compiler/UnavailableServicesCompilerPass.php
@@ -60,7 +60,7 @@ public function process(ContainerBuilder $container): void
     }
 
     /**
-     * @param list<class-string> $classes the services are registered with an alias named after their class
+     * @param list<class-string> $classes the services are registered with their class name as id (or an alias)
      */
     private function replace(ContainerBuilder $container, string $message, array $classes): void
     {
diff --git a/src/DependencyInjection/Configuration.php b/src/DependencyInjection/Configuration.php
index f347ff63..9fcd0f38 100644
--- a/src/DependencyInjection/Configuration.php
+++ b/src/DependencyInjection/Configuration.php
@@ -172,6 +172,10 @@ protected function appendProcessConfigDefinition(NodeBuilder $definition): void
             ->performNoDeepMerging()
             ->cannotBeOverwritten()
             ->info('Unique custom task code')
+            ->validate()
+            ->ifTrue(static fn (array $task): bool => (null === $task['service']) === (null === $task['task']))
+            ->thenInvalid('A task must define either its code ("task: <code>") or, deprecated, its "service", not both: %s')
+            ->end()
             ->children();
 
         $this->appendTaskConfigDefinition($taskListDefinition);
@@ -180,7 +184,16 @@ protected function appendProcessConfigDefinition(NodeBuilder $definition): void
     protected function appendTaskConfigDefinition(NodeBuilder $definition): void
     {
         $definition->scalarNode('service')
-            ->isRequired();
+            ->info('Deprecated, use "task": service id or alias of the task, with or without a leading "@"')
+            ->setDeprecated(
+                'cleverage/process-bundle',
+                '5.4',
+                'The "%node%" option of the task "%path%" is deprecated, reference the task by its code instead ("task: <code>", given on the reference page of each task; give a code to your own tasks with #[AsTask] or a "cleverage.task" tag). It will be removed in v6.0.'
+            )
+            ->defaultNull();
+        $definition->scalarNode('task')
+            ->info('Code of the task (cleverage.task tag, #[AsTask])')
+            ->defaultNull();
         $definition->scalarNode('description')
             ->defaultValue('');
         $definition->scalarNode('help')
diff --git a/src/Registry/ProcessConfigurationRegistry.php b/src/Registry/ProcessConfigurationRegistry.php
index d860b802..1e057aba 100644
--- a/src/Registry/ProcessConfigurationRegistry.php
+++ b/src/Registry/ProcessConfigurationRegistry.php
@@ -86,6 +86,10 @@ protected function resolveConfiguration(string $processCode): void
                 }
                 $rawTaskConfiguration['error_outputs'] = $rawTaskConfiguration['errors'];
             }
+            if (!\is_string($rawTaskConfiguration['service'] ?? null)) {
+                // The "task" codes are resolved into services when the container is compiled (TaskLocatorCompilerPass)
+                throw new \LogicException("The task {$taskCode} of the process {$processCode} has no service: a \"task\" code can only be used in the configurations known when the container is compiled");
+            }
             $taskConfigurations[$taskCode] = new TaskConfiguration(
                 $taskCode,
                 $rawTaskConfiguration['service'],
diff --git a/tests/DependencyInjection/CleverAgeProcessExtensionTest.php b/tests/DependencyInjection/CleverAgeProcessExtensionTest.php
index 135958a4..fce0c464 100644
--- a/tests/DependencyInjection/CleverAgeProcessExtensionTest.php
+++ b/tests/DependencyInjection/CleverAgeProcessExtensionTest.php
@@ -13,6 +13,7 @@
 
 namespace CleverAge\ProcessBundle\Tests\DependencyInjection;
 
+use CleverAge\ProcessBundle\Attribute\AsTask;
 use CleverAge\ProcessBundle\Attribute\AsTransformer;
 use CleverAge\ProcessBundle\Context\ContextualOptionResolver;
 use CleverAge\ProcessBundle\DependencyInjection\CleverAgeProcessExtension;
@@ -22,6 +23,7 @@
 use CleverAge\ProcessBundle\Registry\ProcessConfigurationRegistry;
 use CleverAge\ProcessBundle\Registry\TransformerRegistry;
 use CleverAge\ProcessBundle\Task\DummyTask;
+use CleverAge\ProcessBundle\Tests\Fixtures\AttributedTask;
 use CleverAge\ProcessBundle\Tests\Fixtures\AttributedTransformer;
 use CleverAge\ProcessBundle\Transformer\String\TrimTransformer;
 use CleverAge\ProcessBundle\Transformer\TransformerInterface;
@@ -40,6 +42,7 @@
 #[CoversClass(CleverAgeProcessExtension::class)]
 #[UsesClass(Configuration::class)]
 #[UsesClass(AsTransformer::class)]
+#[UsesClass(AsTask::class)]
 class CleverAgeProcessExtensionTest extends TestCase
 {
     public function testEveryServiceDefinitionFileIsLoaded(): void
@@ -123,6 +126,33 @@ public function testTasksAndTransformersAreAutoconfigured(): void
         self::assertSame([['code' => 'trim']], $container->findDefinition(TrimTransformer::class)->getTag('cleverage.transformer'));
     }
 
+    public function testEveryBundleTaskHasAUniqueCode(): void
+    {
+        $container = new ContainerBuilder();
+        (new CleverAgeProcessExtension())->load([], $container);
+
+        $tagged = $container->findTaggedServiceIds('cleverage.task');
+        self::assertCount(58, $tagged);
+        foreach ($tagged as $id => $tags) {
+            // The id is the class name, the code its snake case without the "Task" suffix
+            $code = strtolower((string) preg_replace('/(?<!^)[A-Z]/', '_$0', (string) preg_replace('/Task$/', '', substr((string) strrchr($id, '\\'), 1))));
+            self::assertSame([['code' => $code]], $tags, $id);
+        }
+    }
+
+    public function testAsTaskAttributeRegistersTheCode(): void
+    {
+        $container = new ContainerBuilder();
+        (new CleverAgeProcessExtension())->load([], $container);
+        $container->setDefinition('app.attributed_task', (new Definition(AttributedTask::class))->setAutoconfigured(true));
+
+        (new AttributeAutoconfigurationPass())->process($container);
+        (new ResolveInstanceofConditionalsPass())->process($container);
+        (new ResolveChildDefinitionsPass())->process($container);
+
+        self::assertSame([['code' => 'app_attributed']], $container->getDefinition('app.attributed_task')->getTag('cleverage.task'));
+    }
+
     public function testAsTransformerAttributeRegistersTheCode(): void
     {
         $container = new ContainerBuilder();
diff --git a/tests/DependencyInjection/Compiler/TaskLocatorCompilerPassTest.php b/tests/DependencyInjection/Compiler/TaskLocatorCompilerPassTest.php
index 3c4b9267..431ab3c3 100644
--- a/tests/DependencyInjection/Compiler/TaskLocatorCompilerPassTest.php
+++ b/tests/DependencyInjection/Compiler/TaskLocatorCompilerPassTest.php
@@ -23,6 +23,7 @@
 use Symfony\Component\DependencyInjection\Argument\ServiceClosureArgument;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Definition;
+use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
 use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\ServiceLocator;
 
@@ -65,6 +66,70 @@ public function testLocatorContainsTheServicesReferencedByTheProcesses(): void
         }
     }
 
+    public function testTaskCodesAreResolvedIntoServices(): void
+    {
+        $container = new ContainerBuilder();
+        (new CleverAgeProcessExtension())->load([[
+            'configurations' => [
+                'test.codes' => ['tasks' => [
+                    'bundle' => ['task' => 'dummy', 'options' => ['format' => '%%s']],
+                    'application' => ['task' => 'app_task'],
+                ]],
+            ],
+        ]], $container);
+        $container->setDefinition('app.task', (new Definition(DummyTask::class))->addTag('cleverage.task', ['code' => 'app_task']));
+
+        (new TaskLocatorCompilerPass())->process($container);
+
+        $configurations = $container->getDefinition('cleverage_process.registry.process_configuration')->getArgument(0);
+        self::assertIsArray($configurations);
+        $tasks = $configurations['test.codes']['tasks'];
+        self::assertSame('@'.DummyTask::class, $tasks['bundle']['service']);
+        self::assertSame('@app.task', $tasks['application']['service']);
+        // Only the service is set: the parameters of the configuration are not resolved (escaped %)
+        self::assertSame(['format' => '%%s'], $tasks['bundle']['options']);
+
+        $locatorReference = $container->getDefinition('cleverage_process.registry.task')->getArgument(0);
+        self::assertInstanceOf(Reference::class, $locatorReference);
+        $services = $container->getDefinition((string) $locatorReference)->getArgument(0);
+        self::assertIsArray($services);
+        self::assertSame([DummyTask::class, 'app.task'], array_keys($services));
+    }
+
+    public function testUnknownTaskCodeThrows(): void
+    {
+        $container = $this->createContainerWithTask(['task' => 'unknown']);
+        $container->setDefinition('app.task', (new Definition(DummyTask::class))->addTag('cleverage.task', ['code' => 'app_task']));
+
+        $this->expectException(InvalidArgumentException::class);
+        $this->expectExceptionMessage('Unknown task code "unknown" for the task "my_task" of the process "test.process". Known codes: "app_task".');
+
+        (new TaskLocatorCompilerPass())->process($container);
+    }
+
+    public function testDuplicateTaskCodeThrows(): void
+    {
+        $container = $this->createContainerWithTask(['task' => 'same']);
+        $container->setDefinition('app.first', (new Definition(DummyTask::class))->addTag('cleverage.task', ['code' => 'same']));
+        $container->setDefinition('app.second', (new Definition(DummyTask::class))->addTag('cleverage.task', ['code' => 'same']));
+
+        $this->expectException(InvalidArgumentException::class);
+        $this->expectExceptionMessage('The task code "same" is used by the "app.first" and "app.second" services.');
+
+        (new TaskLocatorCompilerPass())->process($container);
+    }
+
+    public function testInvalidTaskCodeAttributeThrows(): void
+    {
+        $container = $this->createContainerWithTask(['task' => 'app_task']);
+        $container->setDefinition('app.task', (new Definition(DummyTask::class))->addTag('cleverage.task'));
+
+        $this->expectException(InvalidArgumentException::class);
+        $this->expectExceptionMessage('The "code" attribute of the "cleverage.task" tag of the "app.task" service must be a non-empty string.');
+
+        (new TaskLocatorCompilerPass())->process($container);
+    }
+
     public function testNothingIsDoneWithoutTheRegistries(): void
     {
         $container = new ContainerBuilder();
@@ -73,4 +138,19 @@ public function testNothingIsDoneWithoutTheRegistries(): void
 
         self::assertFalse($container->hasDefinition('cleverage_process.registry.task'));
     }
+
+    /**
+     * @param array<string, mixed> $task
+     */
+    private function createContainerWithTask(array $task): ContainerBuilder
+    {
+        $container = new ContainerBuilder();
+        (new CleverAgeProcessExtension())->load([['configurations' => ['test.process' => ['tasks' => ['my_task' => $task]]]]], $container);
+        // Only the tasks of the test
+        foreach (array_keys($container->findTaggedServiceIds('cleverage.task')) as $id) {
+            $container->getDefinition($id)->clearTag('cleverage.task');
+        }
+
+        return $container;
+    }
 }
diff --git a/tests/DependencyInjection/Compiler/UnavailableServicesCompilerPassTest.php b/tests/DependencyInjection/Compiler/UnavailableServicesCompilerPassTest.php
index 137bf0d7..466cbdb0 100644
--- a/tests/DependencyInjection/Compiler/UnavailableServicesCompilerPassTest.php
+++ b/tests/DependencyInjection/Compiler/UnavailableServicesCompilerPassTest.php
@@ -28,6 +28,7 @@
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\UsesClass;
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\DependencyInjection\Compiler\ResolveClassPass;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Definition;
 
@@ -57,8 +58,8 @@ public function testSerializerServicesAreReplacedWithoutSerializer(): void
             $definition = $container->findDefinition($id);
             self::assertSame(UnavailableTask::class, $definition->getClass(), $id);
             self::assertSame([\sprintf(UnavailableServicesCompilerPass::SERIALIZER_MESSAGE, $id)], $definition->getArguments());
-            // Still referenced by the alias named after the class, and logged in the tasks channel
-            self::assertTrue($container->getAlias($id)->isPublic());
+            // Still public (deprecated fallback on the service container), and logged in the tasks channel
+            self::assertTrue($definition->isPublic());
             self::assertFalse($definition->isShared());
             self::assertSame([['channel' => 'cleverage_process_task']], $definition->getTag('monolog.logger'));
         }
@@ -92,7 +93,7 @@ public function testValidatorTaskIsReplacedWithoutValidator(): void
         $definition = $container->findDefinition(ValidatorTask::class);
         self::assertSame(UnavailableTask::class, $definition->getClass());
         self::assertSame([\sprintf(UnavailableServicesCompilerPass::VALIDATOR_MESSAGE, ValidatorTask::class)], $definition->getArguments());
-        self::assertTrue($container->getAlias(ValidatorTask::class)->isPublic());
+        self::assertTrue($definition->isPublic());
         self::assertFalse($definition->isShared());
         self::assertSame(NormalizerTask::class, $container->findDefinition(NormalizerTask::class)->getClass());
     }
@@ -101,6 +102,8 @@ private function createContainer(bool $serializer, bool $validator): ContainerBu
     {
         $container = new ContainerBuilder();
         (new CleverAgeProcessExtension())->load([], $container);
+        // The class of the services whose id is the class name, as when the container is compiled
+        (new ResolveClassPass())->process($container);
         if ($serializer) {
             $container->setDefinition('serializer', new Definition(\stdClass::class));
         }
diff --git a/tests/DependencyInjection/ConfigurationTest.php b/tests/DependencyInjection/ConfigurationTest.php
index 41d0af4a..8d3ead2b 100644
--- a/tests/DependencyInjection/ConfigurationTest.php
+++ b/tests/DependencyInjection/ConfigurationTest.php
@@ -54,6 +54,62 @@ public function testLogLevelsCanBeConfigured(): void
         );
     }
 
+    public function testTaskIsDefinedByAServiceOrACode(): void
+    {
+        $config = $this->process(['configurations' => ['test.process' => ['tasks' => [
+            'by_service' => ['service' => '@app.task'],
+            'by_code' => ['task' => 'transformer'],
+        ]]]]);
+
+        $tasks = $config['configurations']['test.process']['tasks'];
+        self::assertSame(['@app.task', null], [$tasks['by_service']['service'], $tasks['by_service']['task']]);
+        self::assertSame([null, 'transformer'], [$tasks['by_code']['service'], $tasks['by_code']['task']]);
+    }
+
+    public function testServiceIsDeprecated(): void
+    {
+        $deprecations = [];
+        set_error_handler(static function (int $errno, string $errstr) use (&$deprecations): bool {
+            $deprecations[] = $errstr;
+
+            return true;
+        }, \E_USER_DEPRECATED);
+        try {
+            $this->process(['configurations' => ['test.process' => ['tasks' => [
+                'by_service' => ['service' => '@app.task'],
+                'by_code' => ['task' => 'transformer'],
+            ]]]]);
+        } finally {
+            restore_error_handler();
+        }
+
+        self::assertSame(
+            ['Since cleverage/process-bundle 5.4: The "service" option of the task "clever_age_process.configurations.test.process.tasks.by_service" is deprecated, reference the task by its code instead ("task: <code>", given on the reference page of each task; give a code to your own tasks with #[AsTask] or a "cleverage.task" tag). It will be removed in v6.0.'],
+            $deprecations
+        );
+    }
+
+    /**
+     * @return iterable<string, array{array<string, mixed>}>
+     */
+    public static function provideInvalidTaskDefinitions(): iterable
+    {
+        yield 'neither service nor task' => [['options' => []]];
+        yield 'both service and task' => [['service' => '@app.task', 'task' => 'transformer']];
+    }
+
+    /**
+     * @param array<string, mixed> $task
+     */
+    #[\PHPUnit\Framework\Attributes\DataProvider('provideInvalidTaskDefinitions')]
+    public function testTaskMustDefineEitherAServiceOrACode(array $task): void
+    {
+        $this->expectException(InvalidConfigurationException::class);
+        $this->expectExceptionMessage('A task must define either its code ("task: <code>") or, deprecated, its "service", not both');
+
+        $this->process(['configurations' => ['test.process' => ['tasks' => ['invalid' => $task]]]]);
+    }
+
     public function testInvalidDefaultLogLevelIsRejected(): void
     {
         $this->expectException(InvalidConfigurationException::class);
diff --git a/tests/DependencyInjection/TransformerCodesTest.php b/tests/DependencyInjection/TransformerCodesTest.php
index 4496deae..2e88d6ed 100644
--- a/tests/DependencyInjection/TransformerCodesTest.php
+++ b/tests/DependencyInjection/TransformerCodesTest.php
@@ -18,6 +18,7 @@
 use CleverAge\ProcessBundle\Transformer\TransformerInterface;
 use PHPUnit\Framework\Attributes\CoversNothing;
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\DependencyInjection\Compiler\ResolveClassPass;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 
 /**
@@ -33,6 +34,8 @@ public function testEveryTransformerIsRegisteredWithItsCode(): void
         (new CleverAgeProcessExtension())->load([[
             'generic_transformers' => ['app_generic' => ['transformers' => ['trim' => []]]],
         ]], $container);
+        // The class of the services whose id is the class name, as when the container is compiled
+        (new ResolveClassPass())->process($container);
 
         $tagged = $container->findTaggedServiceIds('cleverage.transformer');
         self::assertCount(38, $tagged);
diff --git a/tests/Fixtures/AttributedTask.php b/tests/Fixtures/AttributedTask.php
new file mode 100644
index 00000000..dcedce82
--- /dev/null
+++ b/tests/Fixtures/AttributedTask.php
@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the CleverAge/ProcessBundle package.
+ *
+ * Copyright (c) Clever-Age
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace CleverAge\ProcessBundle\Tests\Fixtures;
+
+use CleverAge\ProcessBundle\Attribute\AsTask;
+use CleverAge\ProcessBundle\Model\ProcessState;
+use CleverAge\ProcessBundle\Model\TaskInterface;
+
+#[AsTask(code: 'app_attributed')]
+final class AttributedTask implements TaskInterface
+{
+    public function execute(ProcessState $state): void
+    {
+    }
+}
diff --git a/tests/Registry/ProcessConfigurationRegistryTest.php b/tests/Registry/ProcessConfigurationRegistryTest.php
new file mode 100644
index 00000000..e6eceb7e
--- /dev/null
+++ b/tests/Registry/ProcessConfigurationRegistryTest.php
@@ -0,0 +1,45 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the CleverAge/ProcessBundle package.
+ *
+ * Copyright (c) Clever-Age
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace CleverAge\ProcessBundle\Tests\Registry;
+
+use CleverAge\ProcessBundle\Registry\ProcessConfigurationRegistry;
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\TestCase;
+
+#[CoversClass(ProcessConfigurationRegistry::class)]
+class ProcessConfigurationRegistryTest extends TestCase
+{
+    public function testTaskCodeNotResolvedAtCompileTimeThrows(): void
+    {
+        // e.g. a configuration added at runtime: the "task" codes are only resolved when the container is compiled
+        $registry = new ProcessConfigurationRegistry([
+            'test.process' => [
+                'options' => [],
+                'entry_point' => null,
+                'end_point' => null,
+                'description' => '',
+                'help' => '',
+                'public' => true,
+                'tasks' => [
+                    'my_task' => ['service' => null, 'task' => 'transformer', 'errors' => [], 'error_outputs' => []],
+                ],
+            ],
+        ], 'stop');
+
+        $this->expectException(\LogicException::class);
+        $this->expectExceptionMessage('The task my_task of the process test.process has no service: a "task" code can only be used in the configurations known when the container is compiled');
+
+        $registry->getProcessConfiguration('test.process');
+    }
+}