diff --git a/scripts/prompt.md b/scripts/prompt.md
index 8fe8aa7..6044bd2 100644
--- a/scripts/prompt.md
+++ b/scripts/prompt.md
@@ -20,6 +20,12 @@ user's exact instruction.
 Install missing tools yourself when needed, including Rust, uv, Node, Deno, or
 system packages.
 
+Before modifying or pushing code, check for another active automation run that
+may modify the same target branch or work on the same issue or pull request. If
+one exists, continue with read-only work but wait for it to finish before making
+changes. Exclude the current run, use a bounded wait, and re-check the branch
+before pushing. Skip this check when no code changes are needed.
+
 Prefer minimal, correct changes. Run relevant checks or tests if practical.
 Treat code changes as a request to create a pull request. If a prior Codex pull
 request already exists for this issue, update that same pull request instead of