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langchain-eval-harness

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# LangChain Eval Harness (Python)

## Overview

A team swapped `gpt-4o` for `claude-sonnet-4-6` to save money and a week later CS
noticed answer quality dropped on 15% of refund tickets — the regression was
invisible in code review and invisible in CI because no golden set existed.

Fix: a versioned golden set, a stacked eval pipeline (LangSmith +
ragas + deepeval + custom trajectory), and a PR-blocking regression gate
with paired Wilcoxon significance. The tooling exists; the patterns for
wiring it into a statistically honest loop are scattered across five doc sites.

Build a 100-example JSONL golden set, wire LangSmith `evaluate()` with a
custom correctness evaluator, add a ragas quartet (faithfulness, answer
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