ACP session capabilities missing from initialize response

Fixes on record

Merged to main. A stamp counts the issues a fix is linked to.

• #6985 fix(acp): declare session load and resume capabilities in initialize response

  merged to main

  files: acp_adapter/server.py, tests/acp/test_server.py

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  • acp_adapter/server.py

    @@ -36,6 +36,7 @@
         SessionCapabilities,
         SessionForkCapabilities,
         SessionListCapabilities,
    +    SessionResumeCapabilities,
         SessionInfo,
         TextContentBlock,
         UnstructuredCommandInput,
    @@ -245,9 +246,11 @@ async def initialize(
                 protocol_version=acp.PROTOCOL_VERSION,
                 agent_info=Implementation(name="hermes-agent", version=HERMES_VERSION),
                 agent_capabilities=AgentCapabilities(
    +                load_session=True,
                     session_capabilities=SessionCapabilities(
                         fork=SessionForkCapabilities(),
                         list=SessionListCapabilities(),
    +                    resume=SessionResumeCapabilities(),
                     ),
                 ),
                 auth_methods=auth_methods,

  • tests/acp/test_server.py

    @@ -68,9 +68,22 @@ async def test_initialize_returns_capabilities(self, agent):
             resp = await agent.initialize(protocol_version=1)
             caps = resp.agent_capabilities
             assert isinstance(caps, AgentCapabilities)
    +        assert caps.load_session is True
             assert caps.session_capabilities is not None
             assert caps.session_capabilities.fork is not None
             assert caps.session_capabilities.list is not None
    +        assert caps.session_capabilities.resume is not None
    +
    +    @pytest.mark.asyncio
    +    async def test_initialize_capabilities_wire_format(self, agent):
    +        """Verify the JSON wire format uses correct aliases so ACP clients see the right keys."""
    +        resp = await agent.initialize(protocol_version=1)
    +        payload = resp.agent_capabilities.model_dump(by_alias=True, exclude_none=True)
    +        assert payload["loadSession"] is True
    +        session_caps = payload["sessionCapabilities"]
    +        assert "fork" in session_caps
    +        assert "list" in session_caps
    +        assert "resume" in session_caps
     
     
     # ---------------------------------------------------------------------------