diff --git a/.copier-answers.yml b/.copier-answers.yml
index f693810..2c2c3fb 100644
--- a/.copier-answers.yml
+++ b/.copier-answers.yml
@@ -1,5 +1,5 @@
 # Changes here will be overwritten by Copier
-_commit: v0.23.1
+_commit: v0.24.0
 _src_path: .
 copyright_holder: Stephen Kent
 copyright_license: MIT
diff --git a/.github/commit-check.toml b/.github/commit-check.toml
index 8649562..d6b3547 100644
--- a/.github/commit-check.toml
+++ b/.github/commit-check.toml
@@ -2,8 +2,8 @@
 conventional_commits = false
 subject_max_length = 72
 subject_min_length = 1
-# Reject LLM session URL trailers
-message_pattern = '(?ims)(?!.*^[\w-]+-session:\s)'
+# Reject LLM session URL trailers and promotional "Generated with" lines
+message_pattern = '(?ims)(?!.*^(?:[\w-]+-session:\s|\W*generated (?:with|by) \S))'
 ai_attribution = "disclose"
 ai_disclosure_trailers = ["Assisted-by"]
 # Assisted-by: values must not be email addresses or URLs
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index fd17661..90f51d5 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -27,9 +27,13 @@ and that you have the right to submit it under that license.
 A contributor is always the author of their contributions.
 You must read, review, and understand everything you submit, including
 LLM-generated code or text, and be able to explain it on request.
+Contributions must be submitted by a person, not autonomously by a bot or
+LLM agent.
 
 If a commit contains code or text largely generated by an LLM, add an
 `Assisted-by: <tool>:<model>` trailer to its message. This can be done
 automatically with `git commit --trailer="Assisted-by: <tool>:<model>"`.
 
 Do not use `Co-authored-by:` for LLM attribution. LLMs are tools, not authors.
+Do not include LLM session URLs, or promotional lines such as
+"Generated with [...]."