diff --git a/.markdownlintignore b/.markdownlintignore
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--- a/.markdownlintignore
+++ b/.markdownlintignore
@@ -1,3 +1,5 @@
 CHANGELOG.md
 CODE_OF_CONDUCT.md
 .release-notes/
+.claude/
+CLAUDE.md
diff --git a/CLAUDE.md b/CLAUDE.md
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+# glob
+
+<!-- contributor-only -->
+## Contributing with an AI assistant
+
+This is a Pony project. The ponylang org maintains a set of LLM coding skills. If your AI assistant isn't set up with them, install them once:
+
+```bash
+git clone https://github.com/ponylang/llm-skills.git
+cd llm-skills
+python install.py
+```
+
+See the [llm-skills README](https://github.com/ponylang/llm-skills) for details and other harnesses.
+
+When you start working on this project, load the `pony-skills` skill — it tells your assistant which Pony skill to use for each task.
+
+Before opening a pull request, read [CONTRIBUTING.md](CONTRIBUTING.md).
+<!-- /contributor-only -->