Locks (coordination — not persistence)

Dependency note: This skill builds on ai-core and ai-core/middleware. withLocks is a ChatMiddleware that provides a capability. Locks are not part of AIPersistence.stores and are not composed with composePersistence — they ship in @tanstack/ai, independent of @tanstack/ai-persistence.

Why separate?

State stores answer "what is durable chat data?"
Locks answer "who may run this critical section right now?"

withPersistence does not automatically lock a whole turn. Take a per-thread (or other) lock yourself when multi-writer races matter.

Wire locks