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Let ACP-hosted agents' kcap MCP tools find their session - #1819
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An ACP agent's session exists only after session/new, once its environment is fixed, so its MCP servers ask the hosting daemon at call time instead Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Check name Status Explanation Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request. Title check The title clearly and concisely describes the main change: enabling kcap MCP tools used by ACP-hosted agents to resolve their session.
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PR Summary by QodoResolve ACP-hosted agents’ MCP session IDs through the daemon
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Files changed (26)
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Actionable comments posted: 2
- 🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at
@src/Capacitor.Cli.Core/Harness/OpenCode/OpenCodeExtensionInstaller.cs:
- Around line 529-533: Update the session-stamping guard around
`CALLER_SESSION_SERVERS` so it injects `session_id` only for explicitly approved
caller-session tools, not every tool in those servers. Exclude selector tools
such as `kcap-workitems_list_loose_ends` and review read tools in `kcap-plans`
and `kcap-flows` before allowing them.
Review comments at
@test/Capacitor.Cli.Daemon.Tests.Unit/Services/AcpHostedAgentRuntimeFactoryTests.cs:
- Around line 813-815: Update
Every_acp_launch_names_its_agent_and_daemon_and_drops_inherited_sessions to skip
Windows review-flow cases for both Kiro and OpenCode before launching the
process, since both reviewer capabilities reject Windows; leave other vendors
and non-review flows unchanged.
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📒 Files selected for processing: 26
src/Capacitor.Cli.Core/DaemonNameResolver.cssrc/Capacitor.Cli.Core/Harness/OpenCode/OpenCodeExtensionInstaller.cssrc/Capacitor.Cli.Core/LocalIpc/AgentSessionIpc.cssrc/Capacitor.Cli.Core/LocalIpc/FrameCodec.cssrc/Capacitor.Cli.Core/LocalIpc/FrameType.cssrc/Capacitor.Cli.Core/LocalIpc/LocalFrame.cssrc/Capacitor.Cli.Daemon/Services/AcpAgentEnvironment.cssrc/Capacitor.Cli.Daemon/Services/AcpHostedAgentRuntimeFactory.cssrc/Capacitor.Cli.Daemon/Services/AgentOrchestrator.LocalIpc.cssrc/Capacitor.Cli.Daemon/Services/LocalControlCapabilities.cssrc/Capacitor.Cli.Daemon/Services/LocalControlServer.cssrc/Capacitor.Cli/Commands/McpFlowsServer.cssrc/Capacitor.Cli/Commands/McpHandoffServer.cssrc/Capacitor.Cli/Commands/McpSessionId.cssrc/Capacitor.Cli/HarnessRequesterContext.cssrc/Capacitor.Cli/HostedAgentSessions.cstest/Capacitor.Cli.Core.Tests.Unit/Harness/OpenCode/OpenCodeExtensionInstallerTests.cstest/Capacitor.Cli.Core.Tests.Unit/LocalIpc/AgentSessionIpcTests.cstest/Capacitor.Cli.Daemon.Tests.Unit/Services/AcpHostedAgentRuntimeFactoryTests.cstest/Capacitor.Cli.Daemon.Tests.Unit/Services/LocalAgentSessionTests.cstest/Capacitor.Cli.Daemon.Tests.Unit/Services/LocalControlCapabilitiesTests.cstest/Capacitor.Cli.Daemon.Tests.Unit/Services/LocalControlHelloTests.cstest/Capacitor.Cli.Tests.Unit/Commands/McpSessionIdTests.cstest/Capacitor.Cli.Tests.Unit/Commands/McpWorkItemsServerTests.cstest/Capacitor.Cli.Tests.Unit/HarnessRequesterContextTests.cstest/Capacitor.Tests.Helpers/FakeAgentSessionDaemon.cs
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realtonyyoung
changed the title
On list_loose_ends session_id is a filter, and close_loose_end retries without a session only one it defaulted, so the stamp is a per-tool allowlist. A session still being classified waits for it, so a subagent's id is never stamped. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Hooks link the session they post to KCAP_AGENT_ID's agent, and inside an ACP child the daemon already records that session, so the lookup reads KCAP_DAEMON_AGENT_ID. Every runtime now exports it with the daemon's name. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
An ACP agent's first turn is queued before the agent is published and bound, so its first tool call can ask inside that window; the daemon waits up to 10s for the bind rather than answering nothing or a session the server lacks. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Pi, Muse, Antigravity and Codex app-server children also start from the daemon's environment, where a Claude or Codex shell's session ids outrank or bypass the daemon lookup. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
A failed or refused bind left the agent Running with no forwarder, so the wait ran its full 10s and then answered an id the client kept although the server never held it. Nothing is answered until the bind succeeds; the client asks again. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
A PTY vendor other than Claude or Codex sets none of them for its children, so one inherited from a Codex shell outranked the daemon lookup in its MCP servers. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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AI-4205 (no GitHub issue)
What & why
A daemon-hosted agent calling a kcap MCP tool with no
session_idgot "No session id", or silently acted for a session inherited from the shell that started the daemon. An ACP agent's session exists only aftersession/new, once its environment is fixed, so nothing in that environment could name itCLAUDE_CODE_SESSION_ID,KCAP_SESSION_IDandCODEX_THREAD_ID, and every hosted runtime exportsKCAP_DAEMON_AGENT_IDandKCAP_DAEMON_NAME(neither for a private agent). Hooks read neither, so no hook claims a host agentagent-session/1answers an agent's session once its transcript is bound, waiting up to 10s for a launching agent; an unbound or failed bind is answered empty, so the client asks againHarnessRequesterContextasks it when no harness names its own session, ahead of an ambientKCAP_SESSION_IDsession_idnames the caller, only for a session classified as top-levelWhere to look
A known residual: a second harness started from a hosted agent's shell that names no session of its own inherits
KCAP_DAEMON_AGENT_ID, so its unstamped kcap calls resolve to the hosting agent's session. Closing it needs a process-tree check across vendor wrappers. A hyphenated non-GUID ACP id is stored encoded by the server, which does not yet map a bodysession_idback (AI-4231)Verification
Targeted classes run locally across Core, Daemon and CLI: a declare through the real lookup against a fake daemon socket, the bound, pending, failed and unknown frame answers, the seeded environment of every runtime, and the generated plugin run under node. Not run live against a real daemon and vendor
🤖 Generated with Claude Code