When a tool call itself restarts the gateway (docker restart, systemctl
restart, and similar), the process is terminated mid-call — before the
tool result is persisted and before the orderly drain rewind can run. The
transcript tail is left as an assistant(tool_calls) with no matching tool
answer. On resume the model re-issues the unanswered call, taking the
gateway down again — an infinite loop (#49201).
Source fix: _build_gateway_agent_history now strips a trailing
assistant(tool_calls) block that has no tool answers
(_strip_dangling_tool_call_tail), so there is nothing for the model to
re-execute. This complements _strip_interrupted_tool_tails, which only
handles the case where a tool result row exists with an interrupt marker.
Cognitive backstop: the resume-pending system note now states that any
restart command in the history already ran and must not be re-executed or
verified, and the empty-message auto-resume startup turn reports recovery
and asks for instructions instead of the nonsensical "address the user's
NEW message" (there is no new message on that turn).
Reimplements the intent of #49243 by @JoaoMarcos44 at the replay layer.
Fixes#49201
Remove unused imports (F401) and duplicate/shadowed import
redefinitions (F811) across the codebase using ruff's safe
autofixes. No behavioral changes -- imports only.
- ~1400 safe autofixes applied across 644 files (net -1072 lines)
- __init__.py re-exports preserved (excluded from F401 removal so
public re-export surfaces stay intact)
- Re-exports that are imported or monkeypatched by tests but look
unused in their defining module are kept with explicit # noqa:
F401 (gateway/run.py load_dotenv; run_agent re-exports from
agent.message_sanitization, agent.context_compressor,
agent.retry_utils, agent.prompt_builder, agent.process_bootstrap,
agent.codex_responses_adapter)
- Unsafe F841 (unused-variable) fixes deliberately skipped -- those
can change behavior when the RHS has side effects
- ruff lints remain disabled in pyproject.toml (only PLW1514 is
selected); this is a one-time cleanup, not a config change
Verification:
- python -m compileall: clean
- pytest --collect-only: all 27161 tests collect (zero import errors)
- core entry points import clean (run_agent, model_tools, cli,
toolsets, hermes_state, batch_runner, gateway)
- static scan: every name any test imports directly from an edited
module still resolves
When the gateway restarts mid-agent-work, the session transcript ends
on a tool result the agent never processed. Previously, the user had
to type 'continue' or use /retry (which replays from scratch, losing
all prior work).
Now, when the next user message arrives and the loaded history ends
with role='tool', a system note is prepended:
[System note: Your previous turn was interrupted before you could
process the last tool result(s). Please finish processing those
results and summarize what was accomplished, then address the
user's new message below.]
This is injected in _run_agent()'s run_sync closure, right before
calling agent.run_conversation(). The agent sees the full history
(including the pending tool results) and the system note, so it can
summarize what was accomplished and then handle the user's new input.
Design decisions:
- No new session flags or schema changes — purely detects trailing
tool messages in the loaded history
- Works for any restart scenario (clean, crash, SIGTERM, drain timeout)
as long as the session wasn't suspended (suspended = fresh start)
- The user's actual message is preserved after the note
- If the session WAS suspended (unclean shutdown), the old history is
abandoned and the user starts fresh — no false auto-continue
Also updates the shutdown notification message from 'Use /retry after
restart to continue' to 'Send any message after restart to resume
where it left off' — which is now accurate.
Test plan:
- 6 new auto-continue tests (trailing tool detection, no false
positives for assistant/user/empty history, multi-tool, message
preservation)
- All 13 restart drain tests pass (updated /retry assertion)
