The original title is: "Latch: a Python library for idempotent LLM agent tool calls"

Short summary

A developer built 'latch', a pip-installable Python library that wraps LLM agent tool calls with idempotency keys to prevent duplicate side effects on retry. The library also includes circuit breaker, timeout, budget guardrail, and saga orchestration decorators that compose on the same function. The core insight is that agent retry problems are classic distributed-systems issues — idempotency keys have been standard in backend systems for decades but lacked an agent-specific package.

• •Latch provides @idempotent decorator requiring explicit idempotency_key to prevent duplicate side effects on agent retries
• •Library also ships circuit breaker, timeout, budget guardrail, and saga pattern decorators that compose together
• •Problem is classic distributed-systems idempotency applied to the new agent tool-calling context

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