diff --git a/AGENTS.md b/AGENTS.md
index e8fe9d9..ca3e1a7 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -33,5 +33,6 @@
 
 - PR titles must follow [Conventional Commits](https://www.conventionalcommits.org/) — enforced by CI (`pr-semantic.yaml`)
 - Allowed types: `feat`, `fix`, `chore`, `docs`, `style`, `refactor`, `perf`, `test`, `revert`
+- Scopes are optional. If used, they must match `[\w$.\-* ]*` — no `#`, `@`, or other special characters. Do not put issue references (e.g., `#187`) in the scope position; reference issues in the PR body with `Closes #N` instead.
 - Subjects must not start with an uppercase character
 - Agent-assisted commits should include an `Assisted-by: <model>` footer