HARD GATE — Do NOT restart work blindly. Run this diagnostic first when orchestration goes quiet without an explicit terminal state.

Explicit handler for silent stalls in long-running agent workflows (/loop, dispatch-agents, execute-plan, build-epic resume mode).

Signal	Likely cause
No stdout for >5 min on a monitored loop tick	Sleep/watcher misconfigured or prompt never re-armed
Subagent dispatched but no completion message	Agent hung, blocked on approval, or scope too large
dispatch-agents cycle 3 reached with gaps	Circuit exhausted — needs human escalation
Verify command running >15 min	Missing timeout or waiting on external service
handoff.next_skill unchanged across turns	Prior skill never wrote handoff

1. Read state — specs/state.yaml: handoff.next_skill, active_flow, metrics.story_start, open decisions.
2. Check locks — bash scripts/check-stale-locks.sh if present; read specs/agent-locks.yaml.
3. Inspect terminals — list background shells; note PIDs, last output timestamp, exit codes.
4. Classify stall type:
   • waiting_approval — tool blocked on user consent
   • blocked_dependency — prior task incomplete or red gate
   • agent_exhausted — max iterations/cycles reached
   • misconfigured_loop — duplicate sentinel, wrong regex, or sleeper not re-armed
   • external_io — network, CI, or deploy wait without timeout
   • unknown — escalate with evidence bundle
5. Recommend recovery — one action only (resume, kill PID, re-dispatch with smaller brief, escalate to user).
6. Write report — specs/verifications/STALL-<timestamp>.md with classification, evidence, and recommended next skill.

Caller	When to invoke
/loop (Cursor)	After two consecutive ticks with no observable progress
dispatch-agents	When a wave exceeds expected duration with zero returns
execute-plan	When a step checkpoint is overdue
User	“Why did this stop?” / “Nothing is happening”

→ verify: test -f specs/state.yaml && echo "OK: diagnose-stall can read session state" || echo "WARN: no state.yaml — diagnostic limited"

Gate: READY → next: survey-context (if state unclear) or resume prior skill from state.yaml Writes: specs/verifications/STALL-*.md