Shared State & Initialization Safety
Protect shared state from lazy initialization races, lost wakeups, leaked permits, breaker transition races, quota oversubscription, optimistic-lock conflicts, transaction drift, and cache stampedes. This bundle repairs synchronization contracts rather than hiding timing failures with wider locks or retries. Use it when concurrency bugs cause duplicate initialization, missed signals, capacity leaks, stale state, or inconsistent ownership under load.
Works with every agent that reads SKILL.md — Claude Code, Cursor, Codex CLI, Gemini CLI, GitHub Copilot, Windsurf, OpenClaw, and more.
One payment, lifetime access. 8 skills unlock instantly in your library.
What's included
8 skills
Repair duplicate lazy initialization, partial publication, async first-use herds, failure retry storms, reload races, and shutdown conflicts.
Repair lost wakeups in condition variables, worker queues, shutdown gates, wait/notify loops, and hand-built events.
Repair semaphore permit leaks and over-release bugs across exceptions, cancellation, timeouts, task submission, and shutdown.
Repair circuit-breaker state races across closed, open, and half-open transitions without changing resilience policy.
Repair quota races that let concurrent requests exceed seats, projects, storage, credits, jobs, or other SaaS limits.
Repair optimistic-concurrency drift in a repository using Cursor.
Repair transaction boundaries, rollback behavior, nested transaction drift, and unsafe external side effects without widening database locks.
Stop cache stampedes by repairing fill ownership, request coalescing, lock safety, refresh failures, TTL synchronization, and cold-cache overload.
See it in action
Repair Lazy Initialization Races
Example session with this skill installed
Our Python asyncio application lazily initializes a shared SDK client with `if client is None: client = await create_client()`. When traffic starts, many requests enter at once and we see several clients created. If create_client() fails once, a quick retry burst can create another herd. There is also a config reload that clears the client while initialization may still be running. Repair locally with a fake SDK, event barriers, and a fake clock. Do not call the real provider, change client scope, or add unbounded retries.
- Read your context and instructions
- Compiled the repair lazy initialization
Lazy initialization race found. Concurrent first use starts several client creations and reload can be overwritten by an older initializer. The repair introduces one initialization task per config generation, safe publication, stale-generation disposal, shared failure handling, and deterministic concurrency tests. Provider behavior remains unverified.
How to use
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