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langchain-middleware-patterns

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# LangChain Middleware Patterns (Python)

## Overview

Tenant A sends a prompt: *"Summarize this support ticket from **alice@acme.com**
about her overdue invoice."* The chain's caching middleware ran before the PII
redaction middleware, so the raw prompt — email and all — became part of the
cache key. Thirty seconds later Tenant B sends a semantically identical prompt
(different tenant, different customer, same shape). Cache hits. Tenant B's user
gets back a summary that names `alice@acme.com` and her overdue invoice. That is
pain-catalog entry **P24** in production, and it is a real class of incident —
post-mortems read like "we added caching to cut cost, leaked a customer's PII to
a different tenant within an hour."

The sibling failure modes:
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