diff --git a/config.toml b/config.toml
index ed57437b..5b40f217 100644
--- a/config.toml
+++ b/config.toml
@@ -17,7 +17,7 @@ description = "Foundational tools for omics data in the life sciences"
 [taxonomies]
 
 [outputs]
-home = ["html", "rss", "entities"]
+home = ["html", "rss", "entities", "llms"]
 
 [outputFormats.entities]
 mediaType = "application/json"
@@ -28,6 +28,11 @@ notAlternative = true
 [markup.goldmark.renderer]
 unsafe= true
 
+[outputFormats.llms]
+mediaType = "text/plain"
+baseName = "llms"
+isPlainText = true
+
 # The ecosystem registry rebuilds this site when packages.json changes, so a cached copy defeats the trigger.
 # Hugo caches remote resources forever by default, and on Netlify that cache survives between builds.
 [caches.getresource]
diff --git a/layouts/index.llms.txt b/layouts/index.llms.txt
new file mode 100644
index 00000000..768864c0
--- /dev/null
+++ b/layouts/index.llms.txt
@@ -0,0 +1,82 @@
+# scverse
+
+> scverse is a consortium of foundational, interoperable open-source tools for single-cell and spatial omics data analysis in the life sciences.
+
+scverse packages share common data structures (AnnData, MuData, SpatialData) to guarantee interoperability across the ecosystem.
+Most package documentation lives on dedicated external sites, linked below.
+This site (scverse.org) hosts the package index, tutorials, project governance, events, and the blog.
+Every core and community package in the scverse ecosystem registry is listed below, with what it does, how to install it and where its docs live.
+
+## Core packages
+
+Foundational packages maintained by the scverse core team.
+{{- $registry := partialCached "registry.html" "registry" }}
+{{ range $registry.core }}
+{{ partial "inline/llms-entry.txt" . }}
+{{- end }}
+
+{{- /* Ecosystem packages get one section per category, biggest first, so an agent can scan straight to its field. */}}
+{{- $eco := where $registry.pkgs "category" "ecosystem" }}
+{{- $categories := slice }}
+{{- range $eco }}
+  {{- if not (in $categories .primary_category) }}
+    {{- $categories = $categories | append .primary_category }}
+  {{- end }}
+{{- end }}
+{{- $counts := slice }}
+{{- range $categories }}
+  {{- $counts = $counts | append (dict "name" . "count" (len (where $eco "primary_category" .))) }}
+{{- end }}
+{{- range sort $counts "count" "desc" }}
+{{- $category := .name }}
+
+## Ecosystem packages: {{ $category }}
+{{ range sort (where $eco "primary_category" $category) "name" }}
+{{ partial "inline/llms-entry.txt" . }}
+{{- end }}
+{{- end }}
+
+## Learn
+- [Tutorials]({{ absURL "learn/" }}): Getting-started tutorials for the core packages.
+- [Package index]({{ absURL "packages/" }}): All core and ecosystem packages with links to docs, source, and distribution.
+- [Package registry (JSON)]({{ $registry.base }}packages.json): Machine-readable list of every core and ecosystem package, with docs, install names, tags and implementations in other languages.
+- [Single-cell best practices](https://www.sc-best-practices.org/): Community book on best practices for single-cell analysis.
+
+## About
+- [Mission]({{ absURL "about/mission/" }}): What scverse is and why it exists.
+- [Roles and governance]({{ absURL "about/roles/" }}): Core team, steering council, and how the project is run.
+- [Code of conduct]({{ absURL "about/code_of_conduct/" }}): Community standards for participation.
+- [AI policy]({{ absURL "about/ai_policy/" }}): Expectations for contributing AI-assisted code to scverse projects.
+
+## Community
+- [GitHub](https://github.com/scverse): Source code for all scverse packages.
+- [Discourse](https://discourse.scverse.org/): User forum for questions and discussion.
+- [Zulip](https://scverse.zulipchat.com/): Developer chat.
+- [Ecosystem packages](https://github.com/scverse/ecosystem-packages): Community packages built on scverse standards, and inclusion criteria.
+- [cookiecutter-scverse](https://cookiecutter-scverse-instance.readthedocs.io/en/latest/): Project template for creating new scverse-compatible packages.
+
+## Optional
+- [Blog]({{ absURL "blog/" }}): Announcements and release notes.
+- [Events]({{ absURL "events/" }}): Conferences and hackathons.
+- [People]({{ absURL "people/" }}): Contributors and core team.
+- [YouTube](https://www.youtube.com/channel/UCpsvsIAW3R5OdftJKKuLNMA): Recorded talks and workshops.
+
+{{- define "_partials/inline/llms-entry.txt" }}
+{{- /* Registry descriptions carry markdown and hard line breaks; llms.txt wants one line each. */}}
+{{- $desc := trim (.description | markdownify | plainify | htmlUnescape | replaceRE `\s+` " ") " ." }}
+{{- $install := "" }}
+{{- with .install }}
+  {{- if .pypi }}{{ $install = printf "pip install %s" .pypi }}
+  {{- else if .conda }}{{ $channel := split .conda "::" }}{{ $install = printf "conda install -c %s %s" (index $channel 0) (index $channel 1) }}
+  {{- else if .bioconductor }}{{ $install = printf `BiocManager::install("%s")` .bioconductor }}
+  {{- else if .cran }}{{ $install = printf `install.packages("%s")` .cran }}
+  {{- end }}
+{{- end -}}
+- [{{ .name }}]({{ .documentation_home | default .project_home }}){{ if ne .language "Python" }} ({{ .language }}){{ end }}: {{ with .blurb }}{{ . }}. {{ end }}{{ $desc }}.
+{{- with $install }} Install: `{{ . }}`.{{ end }}
+{{- with .tutorials_home }}{{ if ne (strings.TrimSuffix "/" .) (strings.TrimSuffix "/" ($.documentation_home | default "")) }} Tutorials: {{ . }}.{{ end }}{{ end }}
+{{- with .bindings }} Other languages:
+  {{- range $i, $b := . }}{{ if $i }},{{ end }} [{{ $b.name }}]({{ $b.url }}) ({{ $b.language }}){{ end }}.
+{{- end }}
+{{- with .tags }} Tags: {{ delimit . ", " }}.{{ end }}
+{{- end }}