lc-testkit 0.21.0

Testing harness for langchainrust — record real LLM exchanges and replay them offline
Documentation

lc-testkit — a record/replay harness for the framework.

Lets the framework self-test without an API key:

  • [RecordingProvider]: wraps any BaseChatModel, makes one real call, then appends the request/response pair to a JSONL file.
  • [ReplayProvider]: replays from the recording file in FIFO order, zero network.

Data format and usage are described in docs/internal/v0.16.0/HARNESS_DESIGN.md Part A.