fix: migrate to a2a-sdk v1.0 protobuf types

[beonde]

Summary

Migrates all code from a2a-sdk v0.x Pydantic models to v1.0 protobuf-generated types. This fixes the Cross-Product E2E Tests CI failure that has been failing on every main branch commit:

ImportError: cannot import name 'TextPart' from 'a2a.types'

Changes

Type Migration (tests/integration/test_real_executor.py)

v0.x (removed)	v1.0 (new)
TextPart(text=...)	Part(text=...)
FilePart(file=FileWithBytes(...))	Part(raw=..., media_type=..., filename=...)
FilePart(file=FileWithUri(...))	Part(url=..., media_type=..., filename=...)
DataPart(data={...})	Part(data=Value()) via ParseDict
MessageSendParams(message=msg)	SendMessageRequest(message=msg)
Role.user / Role.agent	Role.ROLE_USER / Role.ROLE_AGENT
new_agent_text_message(text)	Message(role=ROLE_AGENT, parts=[Part(text=...)])
RequestContext(request=params)	RequestContext(call_context=ServerCallContext(), request=params)

SDK Compatibility (capiscio_sdk/executor.py)

• Added protobuf MessageToDict support for message-to-dict conversion
• Previously only supported Pydantic model_dump(), falling back to {} for protobuf messages
• Now properly serializes protobuf Message objects for validation

Dependency Update (pyproject.toml)

• a2a-sdk>=0.1.0 → a2a-sdk>=1.0.0

Examples (examples/simple_agent/)

• Updated agent_executor.py and test_client.py for v1.0 types

Testing

• All 20+ integration tests in test_real_executor.py updated
• CI should now pass the Cross-Product E2E Tests job

[github-actions]

✅ Documentation validation passed!

Unified docs will be deployed from capiscio-docs repo.

[github-actions]

✅ All checks passed! Ready for review.

[codecov]

Codecov Report

❌ Patch coverage is 27.27273% with 8 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
capiscio_sdk/executor.py	27.27%	8 Missing ⚠️

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[github-actions]

✅ SDK server contract tests passed (test_server_integration.py). Cross-product scenarios are validated in capiscio-e2e-tests.

[Copilot]

Pull request overview

Migrates the SDK integration points from a2a-sdk v0.x Pydantic models to v1.0 protobuf-generated types, updating tests and examples accordingly and adjusting message serialization in the security executor.

Changes:

• Updated integration tests to construct a2a.types.Message/Part/... protobuf types (incl. SendMessageRequest, ServerCallContext, Struct/Value).
• Updated CapiscioSecurityExecutor to serialize protobuf messages via google.protobuf.json_format.MessageToDict.
• Bumped dependency constraint to a2a-sdk>=1.0.0 and refreshed simple-agent examples.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/integration/test_real_executor.py	Migrates integration tests to protobuf A2A types and updates request/response message construction.
capiscio_sdk/executor.py	Adds protobuf message-to-dict conversion path for validation.
examples/simple_agent/test_client.py	Switches example client request payload serialization to protobuf MessageToDict.
examples/simple_agent/agent_executor.py	Updates example agent executor to emit protobuf Message events instead of helper constructors.
pyproject.toml	Updates dependency to a2a-sdk>=1.0.0.

Comments suppressed due to low confidence (1)

capiscio_sdk/executor.py:105

• identifier = message_dict.get("message_id") ... assumes snake_case keys. If the message dict is produced via protobuf JSON mapping (or Pydantic aliases), the key may be messageId, which would make rate limiting/caching identifiers inconsistent. Consider checking both message_id and messageId (or deriving the identifier directly from the message object) to keep behavior consistent across model types.

        # Extract identifier for rate limiting
        identifier = message_dict.get("message_id") or message.message_id