From a terminal or an agent:
curl -s -X POST https://msampathkumar.com/demos/build-your-pc/api/feedback \
-H 'content-type: application/json' \
-d '{"username": "YOUR_NAME", "user_key": "usr_...", "kind": "agent-report",
"rating": 5, "message": "A2A vs MCP report: ..."}'
kind: bug | idea | praise | agent-report | other. rating (1-5) is optional.