Agent Card implementation
Capability, interface, and security declarations, with field validation and optional signing.
A2A Protocol community
A2A is an open standard for agent discovery, communication, and collaboration. This community offers protocol explanations, implementation guides, and collaboration examples covering capability discovery, messaging, task execution, and interoperability.
An Agent Card describes an agent’s capabilities and interfaces. Messages carry the conversation, Tasks track its work, and Artifacts contain task outputs.
Capability, interface, and security declarations, with field validation and optional signing.
Task states, messages, event streams, and recovery after interruptions.
Bindings, version differences, and compatibility across requests, responses, and errors.
Walkthrough
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.
Read the walkthrough →Authentication, authorization, and task access boundaries.
SSRF protection, request authentication, and replay and duplicate handling.
Implementation strategies for duplicate messages, interrupted streams, and task persistence.
Upstream documentation and protocol explanations.
This site’s index of originals, versions, and synced material.
The official specification and protocol definitions.
A related community covering MCP tool and data access.