feat: live session monitoring with circuit breakers (v1.0.0)#17
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Add `agent-strace watch` — tails the active session's events.ndjson and fires alerts when configurable thresholds are exceeded. Watchers: - RetryWatcher: same command fails N times (default: 5) - CostWatcher: estimated cost exceeds threshold (default: $10) - DurationWatcher: session exceeds time limit (default: 30m) - LoopWatcher: same event sequence repeats N times (default: 3x) - ScopeWatcher: file write denied by .agent-scope.json policy Alert actions: - terminal: print warning to stderr (default) - file: append to .agent-traces/alerts.log - webhook: POST JSON via stdlib urllib.request - kill: SIGTERM to agent process Config via .agent-watch.json or CLI flags. Each violation fires exactly once (deduped by key). Zero new dependencies. 19 new tests covering retry detection, cost threshold, duration limit, loop detection, alert actions, and config loading. Co-authored-by: Ona <no-reply@ona.com>
watch.py: - Remove unused Callable import - Remove dead meta load block (PID not stored in meta) - _dispatch_alert: always write to terminal regardless of action; also write to file when action is 'file' or 'kill' - Cost dedup key: use single 'cost' key so violation fires exactly once, not once per dollar crossed above the threshold - Idle timeout comment: clarify it triggers on the next event after the idle window, not mid-sleep tests/test_watch.py: - Add test: cost violation fires exactly once across multiple events - Add test: _dispatch_alert always calls _alert_terminal regardless of configured action Co-authored-by: Ona <no-reply@ona.com>
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Closes #8
What
Adds
agent-strace watch— real-time session monitoring that tails the active session'sevents.ndjsonand fires alerts when configurable thresholds are exceeded.Usage
Watchers
.agent-scope.jsonpolicyAlert actions
terminal— print warning to stderr (default)file— append to.agent-traces/alerts.logwebhook— POST JSON to a URL (Slack, PagerDuty, etc.) via stdliburllib.requestkill— send SIGTERM to the agent processConfig file (
.agent-watch.json){ "watchers": { "retry": { "max": 3, "alert": "terminal" }, "cost": { "max_dollars": 5.0 }, "duration": { "max_minutes": 15 }, "loop": { "sequence_length": 3, "max_repeats": 3 } }, "webhook": { "url": "https://hooks.slack.com/services/..." } }Implementation
src/agent_trace/watch.py— watcher state machines, alert dispatcher, file tailercost.pytoken estimation (_event_tokens,_dollars)audit.pypolicy loadingZero new dependencies. 19 new tests covering retry detection, cost threshold, duration limit, loop detection, alert actions (terminal + file), and config loading.