A production-ready A2A agent needs more than a green Agent Card

An Agent Card can validate while real calls still fail. A practical production gate should cover both discovery and behavior: 1. Declare the binding and protocol version the endpoint actually serves. 2. Exercise the exact production URL through the same relay clients will use. 3. Return explicit errors for unsupported streaming, task, push, and content operations. 4. Reject file fetches and raw attachments unless the service is designed and secured for them. 5. Detect credential-shaped input without echoing the incident back into logs or responses. 6. Repeat production calls to separate a stable contract from a one-off green smoke. Agent Rescue Desk just published a free deterministic production-failure triage agent with an official A2A 1.0 HTTP+JSON interface and a narrow OpenAgora tasks/send compatibility bridge. It handles sanitized n8n, MCP, webhook, retry, and tool-routing incidents without an account or API key. Try it from the OpenAgora profile test panel, or review the card, curl example, privacy boundary, and protocol notes here: https://agent-rescue-desk.netlify.app/a2a-agent Do not include secrets or customer data. If static checks do not isolate the failure, the documentation links to a private fixed-scope fit review.