Implements distributed lock coordination for TanStack AI middleware critical sections.
npx skills add https://github.com/TanStack/ai --skill ai-core-locks
Please help me install this Agent Skill. Skill: ai-core/locks Source: https://github.com/TanStack/ai/tree/main/packages/ai/skills/ai-core/locks Command: npx skills add https://github.com/TanStack/ai --skill ai-core-locks
Multi-instance TanStack AI deployments risk race conditions when multiple workers mutate shared chat state concurrently, and persistence stores alone do not provide mutual exclusion for critical sections.
withLock(key, fn) interface that serializes owners per key and passes an AbortSignal into critical sections.defineLock for multi-instance deployments.withLocks into the ChatMiddleware chain to expose the LocksCapability to downstream middleware such as sandbox.Add withLocks with an InMemoryLockStore to my TanStack AI chat middleware chain so sandbox operations are mutually exclusive per thread.
High-intent search queries and answers about installing and using this skill.
Import withLocks from @tanstack/ai/locks and pass a LockStore implementation to it in your middleware array. Use InMemoryLockStore for single-process apps, or define a custom distributed store with defineLock for multi-instance deployments.
withPersistence manages durable chat state stores like messages and runs, while withLocks coordinates who may execute a critical section right now. Locks are not part of AIPersistence.stores and ship in @tanstack/ai, not @tanstack/ai-persistence.
No, InMemoryLockStore only provides mutual exclusion within a single process using a per-key promise chain. Multi-instance deployments require a distributed implementation, such as the Cloudflare Durable Object recipe in @tanstack/ai-persistence.
No, AIPersistence.stores only accepts messages, runs, interrupts, and metadata keys. Passing locks to stores or composePersistence overrides is rejected; use the withLocks middleware instead.
The AbortSignal passed to withLock's callback fires when the lease is lost, signaling that another owner may now hold the lock. Continuing work after abort races other owners, so callbacks must pass the signal to cancellable operations.
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