async-state-safety

Development

This skill should be used when the user asks to change "worker lifecycle", "cancellation", "retrigger behavior", "state machine", "delivery receipts", "timeouts", or "race conditions". Enforces explicit async/state invariants and targeted race-safe verification.

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Source SKILL.md: https://github.com/spacedriveapp/spacebot/blob/HEAD/.agents/skills/async-state-safety/SKILL.md

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Async State Safety

Goal

Prevent race regressions in async and stateful paths.

Required Invariants

Define valid terminal states before coding.
Define allowed state transitions before coding.
Keep terminal transitions idempotent.
Ensure duplicate events cannot double-apply terminal effects.
Ensure retries do not corrupt state.

Race Checklist

Cancellation racing completion
Timeout racing completion
Retry racing ack/receipt update
Concurrent updates to the same worker/channel record
Missing-handle and stale-handle behavior

Implementation Checklist

Add or update transition guards.
Keep error handling explicit and structured.
Preserve status/event emission on all terminal branches.
Document why each race path converges safely.

Verification Checklist

Run targeted tests for each touched race path.
Add at least one negative-path test for terminal convergence.
Add at least one idempotency test where applicable.
Run broad gate checks after targeted checks pass.

Handoff Requirements

Terminal states and transition matrix
Race windows analyzed
Targeted commands and outcomes
Residual risks and follow-up tests