diff --git a/AGENTS.md b/AGENTS.md
index 5e589d336dd..3555ef17936 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -134,6 +134,7 @@
   `gh pr list -R "$fork" --state open` (must be empty)
 - Description newline footgun: write Markdown via heredoc to `/tmp/ghsa.desc.md` (no `"\\n"` strings)
 - Build patch JSON via jq: `jq -n --rawfile desc /tmp/ghsa.desc.md '{summary,severity,description:$desc,vulnerabilities:[...]}' > /tmp/ghsa.patch.json`
+- GHSA API footgun: cannot set `severity` and `cvss_vector_string` in the same PATCH; do separate calls.
 - Patch + publish: `gh api -X PATCH /repos/openclaw/openclaw/security-advisories/<GHSA> --input /tmp/ghsa.patch.json` (publish = include `"state":"published"`; no `/publish` endpoint)
 - If publish fails (HTTP 422): missing `severity`/`description`/`vulnerabilities[]`, or private fork has open PRs
 - Verify: re-fetch; ensure `state=published`, `published_at` set; `jq -r .description | rg '\\\\n'` returns nothing