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# LangChain Rate Limits (Python)

## Overview

A team deploys 10 Cloud Run workers. Each worker initializes its `ChatAnthropic`
with `InMemoryRateLimiter(requests_per_second=10)` — they read the docs, they
picked a safe-looking number, they shipped. Thirty seconds later the dashboard
lights up with 429s: the cluster is pushing 100 RPS to Anthropic's 50 RPM
tier-1 ceiling, not the 10 RPS they configured. The name is the fix —
`InMemoryRateLimiter` is **in-process**. Each worker has its own counter. Ten
workers × 10 RPS = 100 RPS to the provider. This is pain-catalog entry **P29**
and it lands on every team that scales past one pod.

Three more traps wait on the same code path:
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