{"type":"begin","data":{"path":{"text":"/home/andy/.agent/sessions/-home-andy-works-agent-sdk-packages-comate_cli/e53450ca-bf86-4f44-8aac-6880b66422cb/e53450ca-bf86-4f44-8aac-6880b66422cb.jsonl"}}}
{"type":"match","data":{"path":{"text":"/home/andy/.agent/sessions/-home-andy-works-agent-sdk-packages-comate_cli/e53450ca-bf86-4f44-8aac-6880b66422cb/e53450ca-bf86-4f44-8aac-6880b66422cb.jsonl"},"lines":{"text":"{\"schema_version\": \"4.0\", \"type\": \"tool\", \"uuid\": \"3a8244e5\", \"parent_uuid\": \"24f95276\", \"logical_parent_uuid\": \"24f95276\", \"message\": {\"role\": \"tool\", \"cache\": false, \"tool_call_id\": \"call_d4917d7d1c914bf790b2d302\", \"tool_name\": \"Agent\", \"content\": \"Now I have all the information needed for a thorough analysis. Let me compile the report.\\n\\n---\\n\\n## Comprehensive Analysis: Comate CLI Exit Mechanism\\n\\n### 1. Entry Point and Main Loop\\n\\n**File: `comate_cli/main.py` (lines 153-214)**\\n\\nThe CLI entry point is `main()` (line 153). It orchestrates the startup sequence:\\n\\n1. Parses CLI arguments (`--help`, `mcp`, `--rpc-stdio`, `-p`, `resume`).\\n2. Creates two guard objects: `_ShutdownNoiseGuard` and `_TerminalStateGuard`.\\n3. Calls `atexit.register(term_guard.restore, reason=\\\"atexit\\\")` and `atexit.register(noise_guard.begin_shutdown)`.\\n4. Delegates to `asyncio.run(run(...))` from `comate_cli/terminal_agent/app.py`.\\n\\n**File: `comate_cli/terminal_agent/app.py` (lines 319-434)**\\n\\nThe `run()` coroutine is the async entry point. It has three operational branches:\\n- **RPC stdio mode** (line 344): Creates `StdioRPCBridge` and calls `bridge.run()`.\\n- **Print mode** (line 354): Calls `_run_print_mode()`.\\n- **TUI mode** (default): Creates `TerminalAgentTUI` and calls `tui.run(mcp_init=...)`.\\n\\nThe TUI's main loop is in `TerminalAgentTUI.run()` (tui.py line 1532), which calls `await self._app.run_async()` -- a prompt_toolkit `Application.run_async()` call (line 1578). The event loop is driven by prompt_toolkit's internal event processing. Two additional long-running tasks run concurrently:\\n- `_ui_tick_task` (line 1566): A ~4-6 fps UI refresh loop.\\n- `_event_pump_task` (line 1571): Consumes session events via `_consume_event_stream()`.\\n\\n### 2. Exit Signals and Keyboard Interrupts\\n\\n**SIGINT (Ctrl+C) handling is multi-layered:**\\n\\n**Layer 1 -- main.py `_ShutdownNoiseGuard`** (lines 66-98):\\n- `install()` hooks `sys.unraisablehook` to suppress `KeyboardInterrupt` noise during interpreter shutdown.\\n- `begin_shutdown()` switches `signal.SIGINT` to `SIG_IGN` (ignore) during final shutdown (line 86). This prevents stray KeyboardInterrupts during cleanup.\\n- Only operates on the main thread.\\n\\n**Layer 2 -- main.py `main()` function** (lines 197-210):\\n```python\\ntry:\\n    asyncio.run(run(...))\\nexcept KeyboardInterrupt:\\n    noise_guard.begin_shutdown()\\nfinally:\\n    noise_guard.begin_shutdown()\\n    term_guard.restore(reason=\\\"main-finally\\\")\\n```\\nA KeyboardInterrupt at the top level triggers noise suppression and terminal state restoration.\\n\\n**Layer 3 -- app.py `_sigint_guard()`** (lines 117-143):\\nA context manager used during `_graceful_shutdown()` that temporarily ignores SIGINT during critical cleanup windows:\\n```python\\nsignal.signal(signal.SIGINT, signal.SIG_IGN)\\n```\\nAfter cleanup completes, it restores the previous handler.\\n\\n**Layer 4 -- TUI Ctrl+C key binding** (key_bindings.py lines 485-521):\\nThe `_interrupt_or_exit` handler implements a **two-press Ctrl+C** protocol:\\n- **When busy**: First Ctrl+C sends `session.run_controller.interrupt(reason=\\\"user\\\")`. Second Ctrl+C within 1.5 seconds calls `_request_exit()` to exit the app.\\n- **When idle**: First Ctrl+C clears the input area. Second Ctrl+C within 700ms calls `_request_exit()`.\\n\\n**Ctrl+D** (key_bindings.py lines 523-526):\\nImmediately calls `_request_exit()` regardless of state.\\n\\n**Escape** (key_bindings.py lines 447-484):\\n- During completion: cancels completion menu.\\n- When busy: sends `session.run_controller.interrupt(reason=\\\"user_esc\\\")` (does NOT exit).\\n- When idle: first press refocuses input, second press clears input.\\n\\n**SIGTERM**: There is **no explicit SIGTERM handler**. SIGTERM would cause the process to terminate without cleanup, but the `atexit` handlers (terminal restore, noise guard) would still run.\\n\\n**EOFError**: Not explicitly handled at the signal level, but `StdioRPCBridge._read_next_input_line()` (rpc_stdio.py line 427) handles EOF via `raw_line == \\\"\\\"` from stdin (line 74), which breaks the main loop.\\n\\n### 3. Exit Paths\\n\\n**Path A: Normal exit via /exit or /quit**\\n- `_slash_exit()` (commands.py line 1172) calls `_request_exit()`.\\n\\n**Path B: Ctrl+D key binding**\\n- `_exit` handler (key_bindings.py line 524) calls `_request_exit()`.\\n\\n**Path C: Double Ctrl+C**\\n- Two Ctrl+C presses within the configured window calls `_request_exit()`.\\n\\n**Path D: KeyboardInterrupt at asyncio.run level**\\n- Caught in `main()` (main.py line 206), triggers noise guard and terminal restore.\\n\\n**Path E: SystemExit from argument errors**\\n- Invalid arguments: `raise SystemExit(2)` (main.py line 183).\\n- -p with no prompt: `raise SystemExit(1)` (main.py line 194).\\n- MCP command error: `raise SystemExit(exc.exit_code)` (main.py line 168).\\n- Preflight abort in print mode: `raise SystemExit(1)` (app.py line 335).\\n- Print mode exception: `raise SystemExit(1) from exc` (app.py line 289).\\n\\n**Path F: RPC stdio EOF**\\n- When stdin returns `\\\"\\\"`, the `StdioRPCBridge.run()` loop breaks (rpc_stdio.py line 75).\\n\\n**Path G: Event pump task completion**\\n- If `_event_pump_task` completes (rpc_stdio.py line 64), the bridge loop exits.\\n\\n**Path H: `/compact` cancellation exit**\\n- If `/compact` is running and user requests exit, it sets `_pending_exit_after_compact_cancel = True` and cancels the compact task. After compact cancellation, `_exit_app()` is called (commands.py lines 1116-1119).\\n\\n### 4. Cleanup and Teardown\\n\\n**atexit handlers** (main.py lines 174-175):\\n1. `term_guard.restore(reason=\\\"atexit\\\")` -- Restores terminal (tty) attributes via `termios.tcsetattr()` or falls back to `stty sane`.\\n2. `noise_guard.begin_shutdown()` -- Switches SIGINT to SIG_IGN.\\n\\n**TUI cleanup** (tui.py lines 1575-1597, the `finally` block of `run()`):\\n```python\\nfinally:\\n    self._closing = True\\n    if self._mcp_init_task is not None:\\n        await self._cancel_task_with_timeout(self._mcp_init_task, ...)\\n    if self._ui_tick_task is not None:\\n        self._ui_tick_task.cancel()\\n        await self._ui_tick_task  # suppress CancelledError\\n    if event_pump_task is not None:\\n        event_pump_task.cancel()\\n        await event_pump_task  # suppress CancelledError\\n    self._renderer.close()\\n```\\n\\n**Session cleanup** (app.py lines 162-180, `_graceful_shutdown()`):\\n- Deduplicates sessions.\\n- Iterates through sessions calling `_shutdown_session()` which prefers `session.shutdown()` over `session.close()`.\\n- Wraps all cleanup in `_sigint_guard()` to prevent interruption.\\n- Flushes Langfuse telemetry if configured.\\n- Logs timing.\\n\\n**RPC stdio cleanup** (rpc_stdio.py lines 82-99):\\n```python\\nfinally:\\n    self._closing = True\\n    self._remove_stdin_reader()\\n    await self._cancel_active_prompt()\\n    # Resolve pending prompt result as cancelled\\n    await self._await_finalize_prompt_task()\\n    # Cancel event pump task\\n```\\n\\n**Print mode cleanup** (app.py lines 290-291):\\n```python\\nfinally:\\n    await _graceful_shutdown(session)\\n```\\n\\n**`_TerminalStateGuard`** (main.py lines 22-63):\\n- On `__init__`, snapshots terminal attributes via `termios.tcgetattr()`.\\n- On `restore()`, restores via `termios.tcsetattr()` or falls back to `subprocess.run([\\\"stty\\\", \\\"sane\\\"])`.\\n\\n**Event loop exception handler** (app.py lines 294-316):\\n- Suppresses `RuntimeError(\\\"cancel scope in a different task\\\")` from MCP transport cleanup race conditions.\\n\\n### 5. TUI-Specific Exit\\n\\nThe TUI uses **prompt_toolkit** (not Textual). The TUI framework lifecycle:\\n\\n1. `Application` object created with `full_screen=False` (tui.py line 593).\\n2. `run_async()` drives the prompt_toolkit event loop (tui.py line 1578).\\n3. Exit is triggered by `_exit_app()` (tui.py line 1461):\\n   ```python\\n   def _exit_app(self) -> None:\\n       self._closing = True\\n       self._session.run_controller.clear()\\n       if self._event_pump_task is not None:\\n           self._event_pump_task.cancel()\\n       if self._app is not None:\\n           self._app.exit(result=None)\\n   ```\\n   This calls `app.exit(result=None)` which makes `run_async()` return, exiting the main loop.\\n\\n4. The `_closing` flag is checked in `_consume_event_stream()` (line 978) and `_ui_tick()` (line 1353) to break their loops.\\n\\n5. The `finally` block in `run()` (line 1579) cancels all background tasks with timeouts.\\n\\n### 6. Exit Codes\\n\\n| Code | Location | Meaning |\\n|------|----------|---------|\\n| 0 (implicit) | main.py line 158, 165, 206 | Normal exit (help, mcp success, Ctrl+C) |\\n| 1 | main.py line 194 | `-p` with no prompt/stdin input |\\n| 1 | app.py line 289 | Print mode query failed |\\n| 1 | app.py line 335 | Preflight abort in print mode |\\n| 2 | main.py line 183 | Invalid CLI arguments |\\n| dynamic | main.py line 168 | MCP command error (`exc.exit_code`) |\\n\\nThe process exits with code 0 in most normal exit paths (KeyboardInterrupt, /exit, Ctrl+D) because the `main()` function returns normally. Only error conditions produce non-zero exit codes.\\n\\n### 7. Agent/Subprocess Cleanup\\n\\n**Session shutdown**: `_graceful_shutdown()` in app.py (lines 162-180) handles all session cleanup:\\n- Calls `session.shutdown()` or `session.close()` on each unique session.\\n- Protected by `_sigint_guard()` to prevent interruption during cleanup.\\n\\n**Async task cancellation**: The TUI's `run()` finally block cancels:\\n- `_mcp_init_task` (with configurable timeout `AGENT_SDK_TUI_MCP_INIT_CANCEL_TIMEOUT_S`, default 1.0s)\\n- `_ui_tick_task`\\n- `_event_pump_task`\\n\\n**`_cancel_task_with_timeout()`** (tui.py lines 1469-1486):\\nA utility that cancels a task and waits up to `timeout_s` for it to finish:\\n```python\\ntask.cancel()\\ndone, _pending = await asyncio.wait({task}, timeout=timeout_s)\\n```\\n\\n**`_schedule_background()`** (tui.py lines 1306-1317):\\nBackground tasks are fire-and-forget with a done callback that logs exceptions. They are NOT tracked for cleanup -- they will be cancelled when the event loop stops.\\n\\n**Run controller clear**: `_exit_app()` calls `self._session.run_controller.clear()` (tui.py line 1463) to interrupt any ongoing agent operation.\\n\\n### 8. Slash Command Exit\\n\\n**`/exit` and `/quit`** are registered as aliases in `SLASH_COMMAND_SPECS` (slash_commands.py lines 108-112):\\n```python\\nSlashCommandSpec(\\n    name=\\\"exit\\\",\\n    description=\\\"Exit terminal agent\\\",\\n    execution_kind=\\\"local\\\",\\n    aliases=(\\\"quit\\\",),\\n)\\n```\\n\\nThe handler `_slash_exit()` (commands.py line 1172) simply calls `_request_exit()`.\\n\\n`_request_exit()` (tui.py lines 1442-1458) has special handling for `/compact`:\\n- If a compaction is in progress, it defers exit until compact cancellation completes by setting `_pending_exit_after_compact_cancel = True`.\\n- Otherwise, it calls `_exit_app()` directly.\\n\\n`/exit` is in the `allow_when_busy` set (tui.py line 672), meaning it can be invoked even while an agent turn is running.\\n\\n### 9. Error Exit Paths\\n\\n**Error handling in `_consume_event_stream()`** (tui.py lines 971-1142):\\n- `asyncio.CancelledError` is re-raised (line 1138-1139).\\n- Other exceptions are caught and delegated to `_handle_error()` (line 1142).\\n\\n**`_handle_error()`** (tui.py lines 895-911):\\n```python\\nasync def _handle_error(self, exc: Exception) -> None:\\n    message, transient_summary, severity = format_error(exc)\\n    self._renderer.append_system_message(message, severity=severity)\\n    self._renderer.interrupt_turn()\\n    await self._animation_controller.shutdown()\\n    self._status_bar.show_transient(transient_summary, severity=severity)\\n    self._set_busy(False)\\n    await self._status_bar.refresh()\\n    self._refresh_layers()\\n```\\nThis does NOT exit the app -- it recovers by displaying the error and resetting the busy state, allowing the user to continue.\\n\\n**StopEvent with error metadata** (tui.py lines 1060-1091):\\nIf a `StopEvent` contains error metadata, the error is displayed but the app continues.\\n\\n**Print mode errors** (app.py lines 286-289):\\n```python\\nexcept Exception as exc:\\n    sys.stderr.write(f\\\"Error: {exc}\\\\n\\\")\\n    raise SystemExit(1) from exc\\n```\\nThis is the only error path that causes an immediate non-zero exit.\\n\\n**RPC stdio errors** (rpc_stdio.py lines 283-303):\\nEvent pump failures set `_init_error` and propagate to any waiting prompt futures.\\n\\n### 10. Test Coverage for Exit\\n\\n**`tests/test_app_shutdown.py`** (86 lines):\\nTests the `_graceful_shutdown()` mechanism:\\n1. **`test_graceful_shutdown_deduplicates_sessions_and_flushes`** (line 23): Verifies that passing the same session twice only shuts it down once, and that `_sigint_guard` is entered/exited and Langfuse is flushed.\\n2. **`test_graceful_shutdown_continues_after_session_failure`** (line 47): Verifies that if one session's `shutdown()` raises, the other sessions are still shut down and Langfuse is still flushed.\\n3. **`test_sigint_guard_restores_handler`** (line 59): Verifies that `_sigint_guard()` correctly saves and restores the SIGINT signal handler.\\n\\n**`tests/test_interrupt_exit_semantics.py`** (318 lines):\\nTests interrupt and exit key binding behaviors:\\n1. **`test_busy_second_ctrl_c_requests_exit_instead_of_force_interrupt`** (line 231): Verifies the two-press Ctrl+C protocol -- first sends interrupt(\\\"user\\\"), second calls `_request_exit()`.\\n2. **`test_closing_tui_ignores_followup_external_turn_events`** (line 248): Verifies that when `_closing=True`, the TUI ignores all events from the event stream.\\n3. **`test_team_idle_auto_turn_uses_lightweight_ui_path`** (line 273): Verifies that idle-auto team inbox turns don't start animations or modify busy state.\\n\\n### 11. RPC/Connection Cleanup\\n\\n**`StdioRPCBridge.run()` finally block** (rpc_stdio.py lines 82-99):\\n1. Sets `self._closing = True`.\\n2. Removes stdin reader from event loop (`_remove_stdin_reader()`, which calls `loop.remove_reader(stdin_fd)`).\\n3. Cancels any active prompt (`_cancel_active_prompt()`).\\n4. Resolves pending prompt futures with `{\\\"status\\\": \\\"cancelled\\\"}`.\\n5. Awaits finalize prompt task.\\n6. Cancels event pump task.\\n\\n**`_remove_stdin_reader()`** (rpc_stdio.py lines 395-405):\\n```python\\nloop.remove_reader(stdin_fd)\\nself._stdin_reader_fd = None\\nself._stdin_queue = None\\n```\\n\\nThe RPC bridge's cleanup is called from `run()` in app.py:\\n```python\\ntry:\\n    await bridge.run()\\nfinally:\\n    await _graceful_shutdown(session)\\n```\\n\\n### 12. Bash Exit Code Green Dot Bug\\n\\n**File: `bash-exit-code-green-dot-bug.md`**\\n\\nThis documents a **known display bug** (not an exit mechanism bug per se, but related to how tool exit codes are displayed). The bug is that when the Bash tool returns a non-zero exit code, the scrollback shows a **green circle** (success) instead of a **red X** (error).\\n\\n**Root cause**: In the SDK layer (`comate_agent_sdk/system_tools/tools/bash.py`), the Bash tool's envelope constructor only marks `ok=False` for `overflowed`, `timed_out`, and `interrupted` cases. A non-zero `exit_code` from the command falls through to `ok=True`.\\n\\n**Call chain** (6 layers):\\n1. SDK `bash.py` sets `ok=True` even on non-zero exit code.\\n2. `output_formatter.py` sees `ok=True` and uses success formatting.\\n3. `tool_exec.py` sets `is_error=False`.\\n4. `tool_execution.py` propagates `is_error=False` via `ToolResultEvent`.\\n5. CLI `event_renderer.py` sets `severity=\\\"info\\\"`.\\n6. `history_printer.py` renders green circle for `severity=\\\"info\\\"`.\\n\\n**Fix**: The document recommends checking `exit_code != 0` before the final `return ok(...)` in the SDK's bash.py. A defensive CLI-side patch is also suggested but not recommended.\\n\\n---\\n\\n### Summary of the Complete Exit Flow\\n\\n```\\nUser triggers exit (Ctrl+C x2 / Ctrl+D / /exit / /quit)\\n  |\\n  v\\n_request_exit() [tui.py:1442]\\n  |-> If /compact running: defer exit (set flag, cancel compact)\\n  |-> Otherwise: _exit_app()\\n       |\\n       v\\n_exit_app() [tui.py:1461]\\n  1. Set _closing = True\\n  2. Clear session run_controller\\n  3. Cancel _event_pump_task\\n  4. Call _app.exit(result=None) -- makes prompt_toolkit return\\n       |\\n       v\\nTerminalAgentTUI.run() finally block [tui.py:1579]\\n  1. _closing = True\\n  2. Cancel MCP init task (with timeout)\\n  3. Cancel UI tick task\\n  4. Cancel event pump task\\n  5. Close renderer\\n       |\\n       v\\napp.py run() finally block [app.py:417-422]\\n  1. Close logging session\\n  2. _graceful_shutdown(session(s))\\n     - SIGINT ignored during cleanup\\n     - Each session: shutdown() or close()\\n     - Flush Langfuse\\n       |\\n       v\\napp.py run() returns normally\\n       |\\n       v\\nmain.py main() finally block [main.py:208-210]\\n  1. noise_guard.begin_shutdown() -- SIGINT -> SIG_IGN\\n  2. term_guard.restore() -- restore tty attrs\\n       |\\n       v\\natexit handlers run:\\n  1. term_guard.restore(reason=\\\"atexit\\\")\\n  2. noise_guard.begin_shutdown()\\n       |\\n       v\\nProcess exits with code 0\\n```\", \"is_error\": false, \"ephemeral\": false, \"destroyed\": false, \"offloaded\": false, \"offload_path\": null}, \"cwd\": \"/home/andy/works/agent-sdk/packages/comate_cli\", \"session_id\": \"e53450ca-bf86-4f44-8aac-6880b66422cb\", \"timestamp\": \"2026-05-17T12:08:19.022075Z\", \"version\": \"comate-agent-sdk\", \"git_branch\": null, \"is_sidechain\": false, \"agent_id\": null, \"team_name\": null, \"agent_name\": null, \"item_id\": \"3a8244e5\", \"item_type\": \"tool_result\", \"content_text\": \"Now I have all the information needed for a thorough analysis. Let me compile the report.\\n\\n---\\n\\n## Comprehensive Analysis: Comate CLI Exit Mechanism\\n\\n### 1. Entry Point and Main Loop\\n\\n**File: `comate_cli/main.py` (lines 153-214)**\\n\\nThe CLI entry point is `main()` (line 153). It orchestrates the startup sequence:\\n\\n1. Parses CLI arguments (`--help`, `mcp`, `--rpc-stdio`, `-p`, `resume`).\\n2. Creates two guard objects: `_ShutdownNoiseGuard` and `_TerminalStateGuard`.\\n3. Calls `atexit.register(term_guard.restore, reason=\\\"atexit\\\")` and `atexit.register(noise_guard.begin_shutdown)`.\\n4. Delegates to `asyncio.run(run(...))` from `comate_cli/terminal_agent/app.py`.\\n\\n**File: `comate_cli/terminal_agent/app.py` (lines 319-434)**\\n\\nThe `run()` coroutine is the async entry point. It has three operational branches:\\n- **RPC stdio mode** (line 344): Creates `StdioRPCBridge` and calls `bridge.run()`.\\n- **Print mode** (line 354): Calls `_run_print_mode()`.\\n- **TUI mode** (default): Creates `TerminalAgentTUI` and calls `tui.run(mcp_init=...)`.\\n\\nThe TUI's main loop is in `TerminalAgentTUI.run()` (tui.py line 1532), which calls `await self._app.run_async()` -- a prompt_toolkit `Application.run_async()` call (line 1578). The event loop is driven by prompt_toolkit's internal event processing. Two additional long-running tasks run concurrently:\\n- `_ui_tick_task` (line 1566): A ~4-6 fps UI refresh loop.\\n- `_event_pump_task` (line 1571): Consumes session events via `_consume_event_stream()`.\\n\\n### 2. Exit Signals and Keyboard Interrupts\\n\\n**SIGINT (Ctrl+C) handling is multi-layered:**\\n\\n**Layer 1 -- main.py `_ShutdownNoiseGuard`** (lines 66-98):\\n- `install()` hooks `sys.unraisablehook` to suppress `KeyboardInterrupt` noise during interpreter shutdown.\\n- `begin_shutdown()` switches `signal.SIGINT` to `SIG_IGN` (ignore) during final shutdown (line 86). This prevents stray KeyboardInterrupts during cleanup.\\n- Only operates on the main thread.\\n\\n**Layer 2 -- main.py `main()` function** (lines 197-210):\\n```python\\ntry:\\n    asyncio.run(run(...))\\nexcept KeyboardInterrupt:\\n    noise_guard.begin_shutdown()\\nfinally:\\n    noise_guard.begin_shutdown()\\n    term_guard.restore(reason=\\\"main-finally\\\")\\n```\\nA KeyboardInterrupt at the top level triggers noise suppression and terminal state restoration.\\n\\n**Layer 3 -- app.py `_sigint_guard()`** (lines 117-143):\\nA context manager used during `_graceful_shutdown()` that temporarily ignores SIGINT during critical cleanup windows:\\n```python\\nsignal.signal(signal.SIGINT, signal.SIG_IGN)\\n```\\nAfter cleanup completes, it restores the previous handler.\\n\\n**Layer 4 -- TUI Ctrl+C key binding** (key_bindings.py lines 485-521):\\nThe `_interrupt_or_exit` handler implements a **two-press Ctrl+C** protocol:\\n- **When busy**: First Ctrl+C sends `session.run_controller.interrupt(reason=\\\"user\\\")`. Second Ctrl+C within 1.5 seconds calls `_request_exit()` to exit the app.\\n- **When idle**: First Ctrl+C clears the input area. Second Ctrl+C within 700ms calls `_request_exit()`.\\n\\n**Ctrl+D** (key_bindings.py lines 523-526):\\nImmediately calls `_request_exit()` regardless of state.\\n\\n**Escape** (key_bindings.py lines 447-484):\\n- During completion: cancels completion menu.\\n- When busy: sends `session.run_controller.interrupt(reason=\\\"user_esc\\\")` (does NOT exit).\\n- When idle: first press refocuses input, second press clears input.\\n\\n**SIGTERM**: There is **no explicit SIGTERM handler**. SIGTERM would cause the process to terminate without cleanup, but the `atexit` handlers (terminal restore, noise guard) would still run.\\n\\n**EOFError**: Not explicitly handled at the signal level, but `StdioRPCBridge._read_next_input_line()` (rpc_stdio.py line 427) handles EOF via `raw_line == \\\"\\\"` from stdin (line 74), which breaks the main loop.\\n\\n### 3. Exit Paths\\n\\n**Path A: Normal exit via /exit or /quit**\\n- `_slash_exit()` (commands.py line 1172) calls `_request_exit()`.\\n\\n**Path B: Ctrl+D key binding**\\n- `_exit` handler (key_bindings.py line 524) calls `_request_exit()`.\\n\\n**Path C: Double Ctrl+C**\\n- Two Ctrl+C presses within the configured window calls `_request_exit()`.\\n\\n**Path D: KeyboardInterrupt at asyncio.run level**\\n- Caught in `main()` (main.py line 206), triggers noise guard and terminal restore.\\n\\n**Path E: SystemExit from argument errors**\\n- Invalid arguments: `raise SystemExit(2)` (main.py line 183).\\n- -p with no prompt: `raise SystemExit(1)` (main.py line 194).\\n- MCP command error: `raise SystemExit(exc.exit_code)` (main.py line 168).\\n- Preflight abort in print mode: `raise SystemExit(1)` (app.py line 335).\\n- Print mode exception: `raise SystemExit(1) from exc` (app.py line 289).\\n\\n**Path F: RPC stdio EOF**\\n- When stdin returns `\\\"\\\"`, the `StdioRPCBridge.run()` loop breaks (rpc_stdio.py line 75).\\n\\n**Path G: Event pump task completion**\\n- If `_event_pump_task` completes (rpc_stdio.py line 64), the bridge loop exits.\\n\\n**Path H: `/compact` cancellation exit**\\n- If `/compact` is running and user requests exit, it sets `_pending_exit_after_compact_cancel = True` and cancels the compact task. After compact cancellation, `_exit_app()` is called (commands.py lines 1116-1119).\\n\\n### 4. Cleanup and Teardown\\n\\n**atexit handlers** (main.py lines 174-175):\\n1. `term_guard.restore(reason=\\\"atexit\\\")` -- Restores terminal (tty) attributes via `termios.tcsetattr()` or falls back to `stty sane`.\\n2. `noise_guard.begin_shutdown()` -- Switches SIGINT to SIG_IGN.\\n\\n**TUI cleanup** (tui.py lines 1575-1597, the `finally` block of `run()`):\\n```python\\nfinally:\\n    self._closing = True\\n    if self._mcp_init_task is not None:\\n        await self._cancel_task_with_timeout(self._mcp_init_task, ...)\\n    if self._ui_tick_task is not None:\\n        self._ui_tick_task.cancel()\\n        await self._ui_tick_task  # suppress CancelledError\\n    if event_pump_task is not None:\\n        event_pump_task.cancel()\\n        await event_pump_task  # suppress CancelledError\\n    self._renderer.close()\\n```\\n\\n**Session cleanup** (app.py lines 162-180, `_graceful_shutdown()`):\\n- Deduplicates sessions.\\n- Iterates through sessions calling `_shutdown_session()` which prefers `session.shutdown()` over `session.close()`.\\n- Wraps all cleanup in `_sigint_guard()` to prevent interruption.\\n- Flushes Langfuse telemetry if configured.\\n- Logs timing.\\n\\n**RPC stdio cleanup** (rpc_stdio.py lines 82-99):\\n```python\\nfinally:\\n    self._closing = True\\n    self._remove_stdin_reader()\\n    await self._cancel_active_prompt()\\n    # Resolve pending prompt result as cancelled\\n    await self._await_finalize_prompt_task()\\n    # Cancel event pump task\\n```\\n\\n**Print mode cleanup** (app.py lines 290-291):\\n```python\\nfinally:\\n    await _graceful_shutdown(session)\\n```\\n\\n**`_TerminalStateGuard`** (main.py lines 22-63):\\n- On `__init__`, snapshots terminal attributes via `termios.tcgetattr()`.\\n- On `restore()`, restores via `termios.tcsetattr()` or falls back to `subprocess.run([\\\"stty\\\", \\\"sane\\\"])`.\\n\\n**Event loop exception handler** (app.py lines 294-316):\\n- Suppresses `RuntimeError(\\\"cancel scope in a different task\\\")` from MCP transport cleanup race conditions.\\n\\n### 5. TUI-Specific Exit\\n\\nThe TUI uses **prompt_toolkit** (not Textual). The TUI framework lifecycle:\\n\\n1. `Application` object created with `full_screen=False` (tui.py line 593).\\n2. `run_async()` drives the prompt_toolkit event loop (tui.py line 1578).\\n3. Exit is triggered by `_exit_app()` (tui.py line 1461):\\n   ```python\\n   def _exit_app(self) -> None:\\n       self._closing = True\\n       self._session.run_controller.clear()\\n       if self._event_pump_task is not None:\\n           self._event_pump_task.cancel()\\n       if self._app is not None:\\n           self._app.exit(result=None)\\n   ```\\n   This calls `app.exit(result=None)` which makes `run_async()` return, exiting the main loop.\\n\\n4. The `_closing` flag is checked in `_consume_event_stream()` (line 978) and `_ui_tick()` (line 1353) to break their loops.\\n\\n5. The `finally` block in `run()` (line 1579) cancels all background tasks with timeouts.\\n\\n### 6. Exit Codes\\n\\n| Code | Location | Meaning |\\n|------|----------|---------|\\n| 0 (implicit) | main.py line 158, 165, 206 | Normal exit (help, mcp success, Ctrl+C) |\\n| 1 | main.py line 194 | `-p` with no prompt/stdin input |\\n| 1 | app.py line 289 | Print mode query failed |\\n| 1 | app.py line 335 | Preflight abort in print mode |\\n| 2 | main.py line 183 | Invalid CLI arguments |\\n| dynamic | main.py line 168 | MCP command error (`exc.exit_code`) |\\n\\nThe process exits with code 0 in most normal exit paths (KeyboardInterrupt, /exit, Ctrl+D) because the `main()` function returns normally. Only error conditions produce non-zero exit codes.\\n\\n### 7. Agent/Subprocess Cleanup\\n\\n**Session shutdown**: `_graceful_shutdown()` in app.py (lines 162-180) handles all session cleanup:\\n- Calls `session.shutdown()` or `session.close()` on each unique session.\\n- Protected by `_sigint_guard()` to prevent interruption during cleanup.\\n\\n**Async task cancellation**: The TUI's `run()` finally block cancels:\\n- `_mcp_init_task` (with configurable timeout `AGENT_SDK_TUI_MCP_INIT_CANCEL_TIMEOUT_S`, default 1.0s)\\n- `_ui_tick_task`\\n- `_event_pump_task`\\n\\n**`_cancel_task_with_timeout()`** (tui.py lines 1469-1486):\\nA utility that cancels a task and waits up to `timeout_s` for it to finish:\\n```python\\ntask.cancel()\\ndone, _pending = await asyncio.wait({task}, timeout=timeout_s)\\n```\\n\\n**`_schedule_background()`** (tui.py lines 1306-1317):\\nBackground tasks are fire-and-forget with a done callback that logs exceptions. They are NOT tracked for cleanup -- they will be cancelled when the event loop stops.\\n\\n**Run controller clear**: `_exit_app()` calls `self._session.run_controller.clear()` (tui.py line 1463) to interrupt any ongoing agent operation.\\n\\n### 8. Slash Command Exit\\n\\n**`/exit` and `/quit`** are registered as aliases in `SLASH_COMMAND_SPECS` (slash_commands.py lines 108-112):\\n```python\\nSlashCommandSpec(\\n    name=\\\"exit\\\",\\n    description=\\\"Exit terminal agent\\\",\\n    execution_kind=\\\"local\\\",\\n    aliases=(\\\"quit\\\",),\\n)\\n```\\n\\nThe handler `_slash_exit()` (commands.py line 1172) simply calls `_request_exit()`.\\n\\n`_request_exit()` (tui.py lines 1442-1458) has special handling for `/compact`:\\n- If a compaction is in progress, it defers exit until compact cancellation completes by setting `_pending_exit_after_compact_cancel = True`.\\n- Otherwise, it calls `_exit_app()` directly.\\n\\n`/exit` is in the `allow_when_busy` set (tui.py line 672), meaning it can be invoked even while an agent turn is running.\\n\\n### 9. Error Exit Paths\\n\\n**Error handling in `_consume_event_stream()`** (tui.py lines 971-1142):\\n- `asyncio.CancelledError` is re-raised (line 1138-1139).\\n- Other exceptions are caught and delegated to `_handle_error()` (line 1142).\\n\\n**`_handle_error()`** (tui.py lines 895-911):\\n```python\\nasync def _handle_error(self, exc: Exception) -> None:\\n    message, transient_summary, severity = format_error(exc)\\n    self._renderer.append_system_message(message, severity=severity)\\n    self._renderer.interrupt_turn()\\n    await self._animation_controller.shutdown()\\n    self._status_bar.show_transient(transient_summary, severity=severity)\\n    self._set_busy(False)\\n    await self._status_bar.refresh()\\n    self._refresh_layers()\\n```\\nThis does NOT exit the app -- it recovers by displaying the error and resetting the busy state, allowing the user to continue.\\n\\n**StopEvent with error metadata** (tui.py lines 1060-1091):\\nIf a `StopEvent` contains error metadata, the error is displayed but the app continues.\\n\\n**Print mode errors** (app.py lines 286-289):\\n```python\\nexcept Exception as exc:\\n    sys.stderr.write(f\\\"Error: {exc}\\\\n\\\")\\n    raise SystemExit(1) from exc\\n```\\nThis is the only error path that causes an immediate non-zero exit.\\n\\n**RPC stdio errors** (rpc_stdio.py lines 283-303):\\nEvent pump failures set `_init_error` and propagate to any waiting prompt futures.\\n\\n### 10. Test Coverage for Exit\\n\\n**`tests/test_app_shutdown.py`** (86 lines):\\nTests the `_graceful_shutdown()` mechanism:\\n1. **`test_graceful_shutdown_deduplicates_sessions_and_flushes`** (line 23): Verifies that passing the same session twice only shuts it down once, and that `_sigint_guard` is entered/exited and Langfuse is flushed.\\n2. **`test_graceful_shutdown_continues_after_session_failure`** (line 47): Verifies that if one session's `shutdown()` raises, the other sessions are still shut down and Langfuse is still flushed.\\n3. **`test_sigint_guard_restores_handler`** (line 59): Verifies that `_sigint_guard()` correctly saves and restores the SIGINT signal handler.\\n\\n**`tests/test_interrupt_exit_semantics.py`** (318 lines):\\nTests interrupt and exit key binding behaviors:\\n1. **`test_busy_second_ctrl_c_requests_exit_instead_of_force_interrupt`** (line 231): Verifies the two-press Ctrl+C protocol -- first sends interrupt(\\\"user\\\"), second calls `_request_exit()`.\\n2. **`test_closing_tui_ignores_followup_external_turn_events`** (line 248): Verifies that when `_closing=True`, the TUI ignores all events from the event stream.\\n3. **`test_team_idle_auto_turn_uses_lightweight_ui_path`** (line 273): Verifies that idle-auto team inbox turns don't start animations or modify busy state.\\n\\n### 11. RPC/Connection Cleanup\\n\\n**`StdioRPCBridge.run()` finally block** (rpc_stdio.py lines 82-99):\\n1. Sets `self._closing = True`.\\n2. Removes stdin reader from event loop (`_remove_stdin_reader()`, which calls `loop.remove_reader(stdin_fd)`).\\n3. Cancels any active prompt (`_cancel_active_prompt()`).\\n4. Resolves pending prompt futures with `{\\\"status\\\": \\\"cancelled\\\"}`.\\n5. Awaits finalize prompt task.\\n6. Cancels event pump task.\\n\\n**`_remove_stdin_reader()`** (rpc_stdio.py lines 395-405):\\n```python\\nloop.remove_reader(stdin_fd)\\nself._stdin_reader_fd = None\\nself._stdin_queue = None\\n```\\n\\nThe RPC bridge's cleanup is called from `run()` in app.py:\\n```python\\ntry:\\n    await bridge.run()\\nfinally:\\n    await _graceful_shutdown(session)\\n```\\n\\n### 12. Bash Exit Code Green Dot Bug\\n\\n**File: `bash-exit-code-green-dot-bug.md`**\\n\\nThis documents a **known display bug** (not an exit mechanism bug per se, but related to how tool exit codes are displayed). The bug is that when the Bash tool returns a non-zero exit code, the scrollback shows a **green circle** (success) instead of a **red X** (error).\\n\\n**Root cause**: In the SDK layer (`comate_agent_sdk/system_tools/tools/bash.py`), the Bash tool's envelope constructor only marks `ok=False` for `overflowed`, `timed_out`, and `interrupted` cases. A non-zero `exit_code` from the command falls through to `ok=True`.\\n\\n**Call chain** (6 layers):\\n1. SDK `bash.py` sets `ok=True` even on non-zero exit code.\\n2. `output_formatter.py` sees `ok=True` and uses success formatting.\\n3. `tool_exec.py` sets `is_error=False`.\\n4. `tool_execution.py` propagates `is_error=False` via `ToolResultEvent`.\\n5. CLI `event_renderer.py` sets `severity=\\\"info\\\"`.\\n6. `history_printer.py` renders green circle for `severity=\\\"info\\\"`.\\n\\n**Fix**: The document recommends checking `exit_code != 0` before the final `return ok(...)` in the SDK's bash.py. A defensive CLI-side patch is also suggested but not recommended.\\n\\n---\\n\\n### Summary of the Complete Exit Flow\\n\\n```\\nUser triggers exit (Ctrl+C x2 / Ctrl+D / /exit / /quit)\\n  |\\n  v\\n_request_exit() [tui.py:1442]\\n  |-> If /compact running: defer exit (set flag, cancel compact)\\n  |-> Otherwise: _exit_app()\\n       |\\n       v\\n_exit_app() [tui.py:1461]\\n  1. Set _closing = True\\n  2. Clear session run_controller\\n  3. Cancel _event_pump_task\\n  4. Call _app.exit(result=None) -- makes prompt_toolkit return\\n       |\\n       v\\nTerminalAgentTUI.run() finally block [tui.py:1579]\\n  1. _closing = True\\n  2. Cancel MCP init task (with timeout)\\n  3. Cancel UI tick task\\n  4. Cancel event pump task\\n  5. Close renderer\\n       |\\n       v\\napp.py run() finally block [app.py:417-422]\\n  1. Close logging session\\n  2. _graceful_shutdown(session(s))\\n     - SIGINT ignored during cleanup\\n     - Each session: shutdown() or close()\\n     - Flush Langfuse\\n       |\\n       v\\napp.py run() returns normally\\n       |\\n       v\\nmain.py main() finally block [main.py:208-210]\\n  1. noise_guard.begin_shutdown() -- SIGINT -> SIG_IGN\\n  2. term_guard.restore() -- restore tty attrs\\n       |\\n       v\\natexit handlers run:\\n  1. term_guard.restore(reason=\\\"atexit\\\")\\n  2. noise_guard.begin_shutdown()\\n       |\\n       v\\nProcess exits with code 0\\n```\", \"token_count\": 4219, \"priority\": 10, \"ephemeral\": false, \"metadata\": {\"tool_execution_meta\": {\"model_name\": \"glm-5.1\"}}, \"cache_hint\": false, \"created_turn\": 1, \"created_at\": 1779019636.9656267, \"tool_name\": \"Agent\", \"is_tool_error\": false, \"destroyed\": false, \"offloaded\": false, \"offload_path\": null, \"turn_number\": 1}\n"},"line_number":7,"absolute_offset":59009,"submatches":[{"match":{"text":"scrollback"},"start":14715,"end":14725},{"match":{"text":"scrollback"},"start":31865,"end":31875}]}}
{"type":"end","data":{"path":{"text":"/home/andy/.agent/sessions/-home-andy-works-agent-sdk-packages-comate_cli/e53450ca-bf86-4f44-8aac-6880b66422cb/e53450ca-bf86-4f44-8aac-6880b66422cb.jsonl"},"binary_offset":null,"stats":{"elapsed":{"secs":0,"nanos":154080,"human":"0.000154s"},"searches":1,"searches_with_match":1,"bytes_searched":114988,"bytes_printed":36046,"matched_lines":1,"matches":2}}}
{"data":{"elapsed_total":{"human":"0.002181s","nanos":2180849,"secs":0},"stats":{"bytes_printed":36046,"bytes_searched":114988,"elapsed":{"human":"0.000154s","nanos":154080,"secs":0},"matched_lines":1,"matches":2,"searches":1,"searches_with_match":1}},"type":"summary"}
