Search the Lexicon: curated project notes, in-place repo documentation, and archived Claude Code / Codex / ChatGPT session transcripts. Hybrid lexical (FTS5) plus semantic (local embeddings) search. Use before re-solving a nontrivial problem to find prior work, past decisions, and approaches that already failed.

Reading the results: score is ordinal and only orders one result set against another in the same query -- it says nothing about whether the Lexicon actually covers the topic. confidence does: it is absolute, runs 0.15-1.00, and is comparable across queries. At or above 0.80 the corpus genuinely covers the point; between 0.60 and 0.80 treat the result as partial or tangential and verify before relying on it. If most results sit below that, the honest answer is that the Lexicon does not cover this -- say so instead of stretching a weak hit. matched_by shows which leg found it: fts is an exact lexical match, vector a semantic one, and both together is the strongest signal.

Read an indexed document, or one chunk of it with surrounding context. Use after lexicon_search to expand a promising result: pass that result's path and chunk_ord.