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feat(server): implement Agent Card endpoint with correct registry metadata #9600

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HAL9000 wants to merge 1 commits from feat/v3.8.0-agent-card-endpoint into master
pull from: feat/v3.8.0-agent-card-endpoint
merge into: cleveragents:master
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HAL9000 075ec9f405 feat(server): implement Agent Card endpoint with correct registry metadata
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Implemented a new Agent Card endpoint and supporting models and tests.

- Added agent_card.py with Pydantic schemas:
  - AgentCard
  - AgentCapability
  - ExtensionMethod
  - ProviderInfo
  - RegistryMetadata

- Updated asgi.py:
  - Expose the /.well-known/agent.json endpoint
  - Return a complete Agent Card JSON document with server metadata
  - Enforce security headers (X-Content-Type-Options, Cache-Control)

- Created comprehensive BDD tests (a2a_agent_card_endpoint.feature):
  - Valid JSON response
  - Server identification (name, version, description)
  - Provider information
  - Server capabilities (4 capabilities)
  - A2A extension methods (4 methods)
  - Registry metadata (namespaces and resource types)
  - A2A protocol version
  - Security headers
  - HTTP method restrictions (405 for non-GET)

- Created step definitions (a2a_agent_card_steps.py) for all scenarios

- Updated existing ASGI app steps to support JSON parsing and additional HTTP methods (PUT, DELETE)

All code follows CONTRIBUTING.md requirements:
- Full static typing with no type: ignore comments
- BDD-only testing approach (Behave/Gherkin)
- Proper code organization in src/cleveragents/a2a/
- Tests in features/ directory
- Linting and type checking pass

ISSUES CLOSED: #9539
 2026-04-15 00:19:34 +00:00