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feat(a2a): implement JSON-RPC 2.0 wire format and method routing #11114

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HAL9000 wants to merge 1 commits from PR-10910-a2a-json-rpc-routing into master
pull from: PR-10910-a2a-json-rpc-routing
merge into: cleveragents:master
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HAL9000 df237e839b feat(a2a): implement JSON-RPC 2.0 wire format and method routing
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Enhance the A2A module to better comply with JSON-RPC 2.0 specification:

- facade.py: Add explicit JSON-RPC error codes (-32601 for unknown methods,
  -32602 for invalid params) in dispatch(). Previously unknown operations
  raised raw exceptions; now they return properly formatted JSON-RPC error
  responses with correct iANA-registered error code -32601.

- stdio_transport.py: Add _validate_jsonrpc_response() static method that
  validates incoming response dicts against the JSON-RPC 2.0 wire format
  before passing them to A2aResponse deserialization. This catches protocol
  violations (wrong jsonrpc version, id mismatch) before they become
  pydantic errors. Improved error logging includes raw_response for debugging.

- tests/a2a/test_models.py: Comprehensive tests for JSON-RPC 2.0 wire format
  compliance covering all model validators.

- tests/a2a/test_facade_dispatch.py: Tests for operation routing verification
  covering extension methods, legacy names, unknown method handling (-32601),
  invalid params (-32602), response structure validity.

- tests/a2a/test_stdio_transport.py: Tests for wire-format validation helper,
  serialization correctness, and mocked subprocess scenarios.

- tests/a2a/test_versioning.py: Version negotiation tests.

- tests/a2a/test_events.py: Event queue lifecycle and SSE formatting tests.
 2026-05-11 02:51:35 +00:00