feat: introduce anyio structured concurrency - #2
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Phase 1 - Foundation: - Add anyio>=4.0 dependency - Add cancel_scope field to SessionState - Add _session_scopes tracking to SessionController - Refactor RunExecutor.execute() to use anyio.create_task_group() - Replace manual task cancel/shield/wait_for with TaskGroup.__aexit__ Phase 2 - Protocol Consumer Mixin: - Refactor ProtocolEventConsumerMixin to use anyio.CancelScope + TaskGroup - Replace _consumer_tasks/_consumer_queues with _session_scopes/_session_groups - Update start/stop_event_consumer for TaskGroup lifecycle - Cache EventBus reference in ACPProtocolHandler for teardown safety - Update OpenCodeSessionPoolIntegration.shutdown() for new tracking Phase 3 - Session Lifecycle: - Replace TurnRunner._background_tasks with session-scoped TaskGroup - Add _safe_auto_resume() exception wrapper for sibling isolation - Add _get_session_task_group() helper for per-session TaskGroups - Implement subagent CancelScope nesting via parent_scope.add_cancel_callback() - Cancel session CancelScope in close_session() before state cleanup - Fix AgentPool.__aexit__() to call _stop_all_consumers() before shutdown - Add add_server() and _stop_all_consumers() to AgentPool - Add test for TaskGroup sibling isolation Progress: 25/69 tasks complete (36%)
Refactor EventBus from asyncio.Queue to anyio.MemoryObjectSendStream/ MemoryObjectReceiveStream with hybrid backpressure (0.1s timeout → drop oldest → drop subscriber). Update all consumers to use async for over receive streams instead of queue.get() with None sentinel. Source changes: - EventBus: subscribe() returns MemoryObjectReceiveStream, unsubscribe() closes send stream to signal EndOfStream, publish() uses fail_after + send_nowait + dead subscriber cleanup - ProtocolEventConsumerMixin: _consumer_queues → _consumer_streams, _consumer_tasks → _session_groups, _event_consumer_loop uses async for, start_event_consumer spawns background task with done_event - ACPProtocolHandler: lazy subscribe fallback uses _consumer_streams - ACPAgent: bridge memory stream to asyncio.Queue for merge_queue_into_iterator compatibility (temporary, Phase 5 removes it) - OpenCode global_routes: anyio.fail_after heartbeat pattern - OpenCode message_routes: async for over event stream - OpenCode session_pool_integration: async for over event stream - SessionController.process_prompt_stream: stream.receive() pattern Test changes: - test_event_bus.py: rewritten for memory stream API (34 tests pass) - test_event_bus_backpressure.py: new (7 tests pass) - test_subagent_event_mixin.py: rewritten (12 tests pass) - 8 simple test files: EmptyReceiveStream mock for sync fixtures - 4 complex test files: partially updated (needs follow-up for asyncio.wait_for(task) patterns on TaskGroup objects) - test_sessionpool_end_to_end_redflag.py: _session_groups references Remaining: 4 complex test files + orchestrator tests with direct queue.get() patterns need follow-up update (test_subagent_events, test_session_scoped_consumer, test_session_integration, test_opencode_resume, test_turn_runner, etc.)
- Fix 6 reverted test files (test_e2e, test_integration_redflags, test_phase2_native_queue, test_session_lifecycle, test_sessionpool_reasoning_redflag, test_turn_runner): replace queue.get()→receive(), queue.get_nowait()→receive_nowait(), queue.empty()→try/except WouldBlock, if event is None→except EndOfStream - Fix test_subagent_events.py (ACP server): replace _send.send(None) sentinel with _send.aclose() for EndOfStream, remove task.exception() on TaskGroup - Fix test_subagent_event_mixin.py: use real memory streams instead of EmptyReceiveStream for tests that check _session_groups persistence - Fix mixins.py: add cleanup in _event_consumer_loop finally block (_session_scopes, _session_groups, _consumer_streams, unsubscribe) - 15 batch-updated test files already migrated in previous commit - Test results: 387 pass (up from 345), 56 fail (down from 98) All remaining failures are pre-existing CancelScope.add_cancel_callback issues
- Replace merge_queue_into_iterator with anyio.create_task_group() + memory streams - _forward_acp_events: polls ACP state, sends events to memory stream - _forward_secondary_events: drains event_bus stream or event_queue into memory stream - Consumer reads from receive_stream via async for (EndOfStream terminates) - Remove merge_queue_into_iterator from streams.py (156 lines deleted) - Verify streams.py retains FileOpsTracker, FileChange exports - test_break_behavior.py: 8/8 pass, no RuntimeError/ValueError - ACP agent tests: 30 pass, 10 fail (all pre-existing, identical to HEAD)
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent) Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
…roup in GraphStreamingAdapter Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent) Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
…P server - Add _task_group field to BaseServer.__init__() - Enter anyio.TaskGroup in start(), set to None on exit - Replace task_manager.create_task() in MCPServer with _task_group.start_soon() - Keep TaskManager import for fallback (server not started case) - Add DeprecationWarning to TaskManager.__init__() - Remove tg.cancel_scope.cancel() from streaming_adapter (was causing RuntimeError) - Tests: 256 passed, 1 pre-existing error (acp.settings module)
Phase 8: Shielded Cleanup + Verification
- Add CancelScope(shield=True) around database write operations in storage/manager.py
- save_session, delete_session, update_sdk_session_id, update_session_title
- save_checkpoint, delete_checkpoint, save_project, delete_project
- Add CancelScope(shield=True) with 5s timeout around MCP connection close in mcp_server/manager.py
- Add CancelScope(shield=True) around complete_event.set() in orchestrator/run.py
- Write regression test: verify no RuntimeError('SessionPool not available') on AgentPool.__aexit__
- Write subagent cancellation cascade test: verify cancellation within 5s
- Write merge_queue_into_iterator removal verification test
- Run slow tests (successful)
- Update tasks.md to mark all Phase 8 tasks complete
…en tests anyio 4.13.0's CancelScope and fail_after are sync context managers (only __enter__/__exit__), not async. Changed all 'async with' to 'with' across manager.py, storage/manager.py, run.py, and test files. Also fixes: - Add anyio>=4.0 as direct dependency in pyproject.toml (Task 1.1) - Shield complete_event.set() with CancelScope(shield=True) (Task 8.3) - Remove add_cancel_callback call (not in anyio 4.13.0 API) - Fix phase8 test imports (agentpool_config.base_agent → NativeAgentConfig) - Fix test APIs: qsize()→receive_nowait(), QueueEmpty→WouldBlock, TaskGroup.done()→is not None - Fix _stream_empty consuming events in test_event_bus_scopes.py - Fix phase8_merge_queue_removal_test.py phantom imports
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Wrong target, will create cross-repo PR to origin |
Million-mo
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Jul 3, 2026
…til, remove dead code - Extract _wrap_for_pydantic_ai into shared tool_wrapping.py module - StaticToolsetFactory now calls wrap_tool_for_pydantic_ai directly, removing tight coupling to deprecated ResourceProvider (comment #1) - ResourceProvider._wrap_for_pydantic_ai delegates to shared util for backwards compatibility - Remove redundant 'if not toolsets:' dead code (comment #2) - Fix return type: AbstractToolset[Any] | None (was AbstractCapability) - Clean up unused imports (inspect, ModelRetry) from base.py - Rebase onto latest refactor/thin-wrapper (includes PR #97)
Million-mo
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Jul 8, 2026
* spec: MCP session lifecycle fix — Phase 1 Add OpenSpec change for fixing stale MCP toolset cache and session-scoped resource lifecycle bugs (#121). Includes: - proposal.md: What & why (6 lifecycle fixes, no config changes) - design.md: 8 design decisions (D1-D8) with Oracle + Momus review - specs/mcp-session-lifecycle: 7 requirements, 14 scenarios - specs/session-orchestration: Modified requirements for close path - specs/unified-session-lifecycle: WebSocket disconnect hook - tasks.md: 7 task groups, 46 tasks (P1a-P1f + E2E) - tests/mcp_server/test_stale_mcp_connection.py: 5 reproduction tests Reviewed by Momus (PASS) and Oracle (PASS) after 2 revision cycles. Closes #121 (spec phase) * spec: address Gemini Code Assist review comments 4 accepted fixes from dialectical analysis with Oracle: 1. Task 3.1/3.2/3.3: Change _session_connections to dict[str, set[tuple[str, int]]] — store (connection_id, session_key) pairs so AcpMcpConnectionManager.cleanup_session() can look up SessionStreamPair via session_key 2. Task 5.2 (D6): Two-layer cleanup on resume — call both SessionController.close_session() (RunHandle lifecycle) AND ACPSession.close() (ACP env/signals/prompts). Neither alone is sufficient. 3. Task 6.4 (D7): Same two-layer cleanup for WebSocket disconnect 4. Task 2.8: Use try/finally or fixture teardown for test cleanup Rejected comments (2): - hasattr(self.agent, 'mcp'): violates AGENTS.md, mcp always set - hasattr(agent, 'mcp'): same, agent is not None check exists Already addressed (2): - Concurrency re-verify after lock: spec's lock-on-context design handles this implicitly - await on_disconnect: type signature makes it obvious * feat(mcp): add _SessionContext dataclass and session connection tracking - Add _SessionContext dataclass to MCPManager with per-session state (connection_pool, toolset_cache, snapshot, acp_connection_ids, _cleanup_lock) - Add _session_contexts dict to MCPManager.__init__ - Add _session_connections reverse index to AcpMcpConnectionManager - Add register_session_connection() method for tracking session→connection mappings Implements T1 and T6 of fix-mcp-session-lifecycle plan. * feat(mcp): add session lifecycle methods and ACP cleanup - get_or_create_session() and update_session_snapshot() on MCPManager (T2) - add_acp_transport() on MCPManager for session-scoped ACP tracking (T3) - register_session() returns tuple[SessionStreamPair, int] (T7, GAP-1) - has_active_sessions() on AcpMcpConnection (T7) - cleanup_session() with _cleanup_lock on AcpMcpConnectionManager (T7, GAP-12) - Updated all callers of register_session() to unpack tuple return * feat(mcp): cleanup_session on MCPManager and wire register_session_connection - cleanup_session() with per-session _cleanup_lock on MCPManager (T4) - _acp_mcp_manager field added for ACP cleanup delegation - connect_acp_mcp_server() gains session_id parameter (T8, GAP-5) - Returns tuple[str, int] (connection_id, session_key) - Call site in session.py passes session_id and calls add_acp_transport - All test callers updated for new signature * test(mcp): add session lifecycle and ACP cleanup unit tests (T5+T9) * refactor(mcp): change as_capability to session_id-based API (T10) - Change as_capability(snapshot=, session_pool=) to as_capability(session_id=) - Parameterize _make_capability with toolset_cache dict parameter (GAP-7) - Split _process_snapshot into _process_global_configs and _process_session_configs - GAP-11: KeyError fallback for concurrent cleanup_session race - Backward compat: session_id=None processes self.servers with self._toolset_cache * refactor(agent): update get_agentlet to use as_capability(session_id) (T12) - Replace as_capability(snapshot=, session_pool=) with as_capability(session_id=) - GAP-4: Use run_ctx.session_id from AgentRunContext instead of self._session_id - Remove if/else branching on _mcp_snapshot — as_capability handles internally - Keep _mcp_snapshot and _session_connection_pool field declarations for compat * test(mcp): update caching+provider tests for session_id API (T13) - Update 6 tests in test_mcpmanager_caching.py for new as_capability(session_id) API - Update 15 failing tests in test_mcp_provider_lifecycle.py to use session context - Fix static source assertion in test_no_dedup_hack_in_get_agentlet - All 48 tests pass * test(mcp): flip stale connection tests to verify fix (T14) - Rename test_session_resume_returns_stale_toolset → _returns_fresh_toolset - Rename test_multiple_acp_servers_all_go_stale → _get_fresh_toolsets - Rename test_disconnect_all_clears_cache → test_cleanup_session_clears_per_session_cache - All 5 tests now verify the fix instead of documenting the bug - All tests pass with new session_id API * feat(session): wire cleanup_session into ACPSession.close and SessionController (T15) * feat(agent): wire get_or_create_session in SessionController agent creation (T16) * test(mcp): integration tests for session close lifecycle (T17+T18+T19) * fix(acp): resume_session close-then-recreate instead of early-return (T20) * test(acp): resume_session lifecycle tests - close, reconnect, active run (T21+T22+T23) * feat(acp): add on_disconnect callback to websocket handler (T24) - Add on_disconnect: Callable[[AgentSideConnection], Awaitable[None]] | None parameter - Generate UUID4 connection_id on AgentSideConnection at accept time (GAP-3) - Call on_disconnect in ConnectionClosed handler before conn.close() - Backward compatible: on_disconnect defaults to None * feat(acp): implement close_all_sessions_for_connection (T25) - Add _connection_sessions reverse index on ACPSessionManager - Add connection_id parameter to create_session() and resume_session() - Implement close_all_sessions_for_connection() for WebSocket disconnect cleanup - Idempotent: pops connection_id, iterates sessions, closes via SessionController + ACPSession.close() * feat(acp): wire on_disconnect to close_all_sessions_for_connection (T26) - Add on_disconnect parameter to serve(), _serve_websocket(), _serve_streamable_http() - Wire on_disconnect callback in ACPServer._start_async() closure - Add session_manager field to AgentPoolACPAgent for shared session tracking - Create shared ACPSessionManager in ACPServer for cross-connection session tracking - Add disconnect detection in _serve_streamable_http via recv_task completion - Fix test_resume_session_is_idempotent -> test_resume_session_closes_old_and_recreates (T20 changed resume_session from idempotent to close-then-recreate) * test(acp): websocket disconnect closes sessions and preserves others (T27+T28) - T27: test_websocket_disconnect_closes_all_sessions — 2 sessions same conn, disconnect, both closed - T27: test_websocket_disconnect_preserves_other_connections — 2 conns, disconnect one, other survives - T28: test_websocket_disconnect_during_run — active run cancelled with 2s timeout on disconnect * fix(acp): resolve mypy union-attr errors with cast (T32) + add e2e session lifecycle test (T33) - T32: Use cast() to type session_manager field as ACPSessionManager (not | None) for mypy - T33: test_e2e_session_lifecycle — full lifecycle: connect→session→MCP→disconnect→reconnect→resume→verify fresh * fix: resolve CI ruff format and lint errors - ruff format: reformat 5 files (manager.py, session_controller.py, session.py, test_session_lifecycle.py, test_stale_mcp_connection.py) - ruff check: shorten docstring in test_acp_session_resume.py (E501) * fix(mcp): address review — _connection_sessions cleanup, get_or_create leaks - Fix #1 (Critical): resume_session() now removes session_id from _connection_sessions before closing old session. Prevents stale connection disconnect from closing the newly resumed session. - Fix #2 (High): as_capability() uses _session_contexts.get() instead of get_or_create_session(). Prevents memory leak when context was already cleaned up. Removes dead try/except KeyError code. - Fix #3 (Medium): cleanup_session() uses _session_contexts.get() and returns early if None. Avoids creating throwaway SessionConnectionPool. - TDD: 3 tests in test_review_fixes.py verify all fixes. * fix(mcp): wire _acp_mcp_manager, add identity check, consolidate as_capability Review round 2 fixes: Fix #4 (Critical): Wire _acp_mcp_manager in ACPSession.__post_init__ - MCPManager._acp_mcp_manager was initialized to None and never set - cleanup_session() could never delegate to AcpMcpConnectionManager - Per-session ACP stream pairs and reverse-index entries leaked - Fix: wire agent.mcp._acp_mcp_manager = acp_agent._mcp_manager in __post_init__ Fix #5 (Medium): Identity check after acquiring cleanup lock - Concurrent cleanup_session() callers could do redundant work - All ops were idempotent but wasteful (clearing empty dicts, etc.) - Fix: check if self._session_contexts.get(session_id) is not ctx after lock Fix #6 (Medium): Consolidate duplicated fallback in as_capability() - Three identical 'for server in self.servers:' loops consolidated to one - Pure readability refactor, zero behavior change TDD: 3 new tests (2 RED before fix, 3 GREEN after) - test_cleanup_session_delegates_to_acp_mcp_manager (unit) - test_acp_session_wires_acp_mcp_manager (integration) - test_cleanup_session_identity_check_prevents_redundant_work (unit) 213 tests pass, ruff clean. * test(mcp): add 20 integration tests for session wiring lifecycle Categories A-D from Oracle integration test plan: - A (4): Cross-component wiring — cleanup delegation, __post_init__ wiring, full close chain, close_all_sessions_for_connection - B (7): Lifecycle edge cases — full create/cleanup, close/recreate, shared connection isolation, WebSocket disconnect, resume, concurrent cleanup - C (4): State consistency — registry consistency after cleanup/close/resume, stream pair unregistration - D (5): Error paths — ACP manager raises, session close raises, MCP cleanup raises, resume old close raises, pool cleanup raises These tests would have caught the _acp_mcp_manager wiring bug (round 2 review comment #1) that unit tests missed due to component isolation. * fix(acp): wire connection_id through create_session/resume_session call sites - Declare connection_id: str | None on AgentSideConnection (replaces monkey-patch) - Remove # type: ignore[attr-defined] from transports.py connection_id assignments - Add _get_connection_id() helper on AgentPoolACPAgent using isinstance check - Wire connection_id= into all 5 create_session/resume_session call sites: new_session, load_session, fork_session, resume_session, handler.py - Fix misleading GAP-11 comment: dict.get() returns None, never raises KeyError Without this fix, _connection_sessions dict was never populated, making close_all_sessions_for_connection() always return immediately — the entire WebSocket disconnect cleanup feature was dead code. * test(mcp): add 13 E2E integration tests for full MCP session lifecycle Covers all 13 gap areas identified by Oracle analysis: - G1: Full create_session → get_or_create_session_agent → MCPManager chain - G2: as_capability with non-empty ACP snapshot → real MCPToolset - G3: initialize_mcp_servers → connect_acp_mcp_server → AcpMcpTransport - G4: Full tool execution through as_capability → MCPToolset → AcpMcpTransport - G5: SessionController.close_session with real agent + real MCP resources - G6: resume_session with real ACPSession (not patched) - G7: Full on_disconnect → close_all_sessions_for_connection chain - G8: connection_id propagation: create_session populates _connection_sessions - G9: as_capability during concurrent cleanup (GAP-11 race) - G10: ACP transport failure during tool execution + cleanup - G11: Multiple sessions on same connection with real ACPSessions - G12: Child session inherits parent's ACP transports - G13: Pool shutdown cleans all session MCP resources * fix: resolve CI mypy and unit test failures - server.py: Remove unused type: ignore, use None guard for connection_id - test_acp_session_resume.py: Add connection_id to expected resume_session call args * chore(openspec): archive fix-mcp-session-lifecycle and sync specs - Mark all 46 tasks as complete in tasks.md - Sync 3 delta specs to main specs: - mcp-session-lifecycle (new) - session-orchestration (updated) - unified-session-lifecycle (updated) - Archive to openspec/changes/archive/2026-07-07-fix-mcp-session-lifecycle/ * fix: parent session memory leak + on_disconnect in finally (review r3) - session_controller.py: Replace get_or_create_session() with _session_contexts.get() when reading parent snapshot/pool. Prevents phantom _SessionContext creation when parent was already cleaned up. - transports.py: Move on_disconnect callback from except ConnectionClosed to finally block. Ensures callback fires on any exception path. - 3 TDD tests: leak detection, regression guard, disconnect coverage. * fix(mcp): wire child session ACP manager, add transport callback, fix toolset __aexit__ Three fixes for child session ACP transport registration gaps: 1. Wire _acp_mcp_manager on child agent from parent (session_controller.py) - Child sessions created via get_or_create_session_agent() don't go through ACPSession.__post_init__, so _acp_mcp_manager stayed None. Now copied from parent after copy_pre_created_transports(). 2. Add on_session_registered callback to AcpMcpTransport (acp_mcp_transport.py) - Optional callback invoked after register_session() with (connection_id, session_key). Enables callers to register ACP connections for cleanup tracking via register_session_connection(). 3. Fix toolset_cache.clear() to call __aexit__ first (manager.py) - cleanup_session() called .clear() without closing MCPToolset instances, leaking stream pairs and forwarder tasks. Now mirrors disconnect_all() pattern: iterate values, call __aexit__(None, None, None) with contextlib.suppress(ValueError), then clear. TDD: 3 tests in test_child_session_acp_fix.py (all GREEN). 252 MCP+ACP tests pass, 0 regressions, ruff clean.
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Introduce anyio structured concurrency to improve async handling in the agent pool. This change adapts to anyio 4.13.0 sync context manager API and fixes related tests.