Glossary: Agent Tools and MCP

HTTP status codes

Also written: 401, 403, 400, 404, 421, 500, 401 Unauthorized, 403 Forbidden

Numbers an HTTP server returns: 400 header mismatch, 401 missing or wrong key or token, 403 forbidden (bad Origin or missing scope), 404 not found, 421 wrong host, 500 server error.