A2A Implementation Guides
A2A Implementation Guides
These guides cover Agent Cards, task execution, security, and failure recovery. The ticket analysis walkthrough connects messaging with task handoff; the production readiness checklist collects pre-release checks.
Implement a first collaboration
- Publish an Agent Card so a client can discover the declared interfaces, capabilities and security requirements.
- Run a task and follow its messages, state changes and output artifacts.
- Handle duplicates and recovery before relying on retries or reconnects.
- Use the production readiness checklist to review security, observability and rollback for your deployment.
Guides by topic
| Guide | Coverage |
|---|---|
| Agent Card implementation | Capability, interface, and security declarations, with field validation and optional signing. |
| Task runtime | Task states, messages, event streams, and recovery after interruptions. |
| Security implementation | Authentication, authorization, and task access boundaries. |
| Push notification security | Webhook URL validation on the sender, with authentication and duplicate handling on the receiver. |
| Task idempotency and recovery | Duplicate-message policy, stream recovery, and restart handling, with a runnable reference endpoint and probes asserted by business execution counts. |
| Production readiness checklist | Checks for public interfaces, security boundaries, observability, and rollback. |
| Agent collaboration for ticket analysis | A coordinating agent delegates ticket analysis to a specialist, supplies additional information through messages, tracks the task, and retrieves its output. The walkthrough also explains the boundary between A2A collaboration and MCP tool access. Protocol interaction examples; not tested end to end. |