Add Citation Faithfulness Check notebook (RAG cookbook) - #783
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A deterministic, zero-token check on top of Cohere Chat citations: verify each cited span appears verbatim in the source document it is attributed to, catching fabricated, franken-, and misattributed citations before they reach a user. Runs offline in CI on Cohere-shaped citations; includes a live co.chat (ClientV2) example gated behind COHERE_API_KEY. Added to the RAG cookbook index. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Cohere Chat grounds answers in
documentsand returns citations — spans of the reply linked to the source documents they came from. This notebook adds a small, deterministic faithfulness check on top of those citations: it verifies each cited span appears verbatim in the document it is attributed to, catching the three failure modes that read as authoritative and slip past an LLM judge:The core gate is pure string work: no model, no tokens, no API key, so the first section runs in CI. A second section wires the same gate over a live
co.chat(ClientV2) response and is gated behindCOHERE_API_KEY.The offline section executes end-to-end (verified with
nbclient):Added to the RAG cookbook index in
notebooks/README.md. The gate is inlined so the notebook has no extra dependency; its standalone, framework-agnostic version (plus an optional burden-of-proof LLM judge for the harder "does this span actually support the claim?" case) lives at https://github.com/Palo-Alto-AI-Research-Lab/verbatim-citation-gate .Note
Low Risk
Documentation-only notebook and README index update; no production code or runtime behavior changes.
Overview
Adds a new RAG cookbook notebook that shows how to deterministically validate Cohere Chat citations before they reach users: each cited span must appear verbatim in the document it points to.
The notebook inlines a small
normalize+gatehelper (no extra package) that classifies citations asfound,misattributed, ornot_found, covering fabricated text, frankenquotes, and wrong-document attribution. An offline section runs on sample Cohere-shaped citations without an API key (CI-friendly); an optional section applies the same gate to liveClientV2co.chatcitations whenCOHERE_API_KEYis set.notebooks/README.mdgains a RAG table entry for Check Citation Faithfulness with Colab link.Reviewed by Cursor Bugbot for commit ebb56a0. Bugbot is set up for automated code reviews on this repo. Configure here.