Sherlog is a local-first CLI for searching local Codex, Claude Code, and Pi session logs. It is built for agents that know how to investigate: find the right session first, then read only the relevant range or page.
Install the CLI globally:
npm i -g @act0r/sherlog
shlog --helpInstall the agent skill separately:
npx skills add -g catoncat/sherlogInitialize the default Codex index:
shlog syncSearch and read progressively:
shlog find "health check"
shlog read-range <sessionRef> --seq <matchSeq>
shlog read-page <sessionRef> --offset 0 --limit 20If find prints next: or JSON includes nextAction, refresh the suggested coverage and retry before treating the results as complete. Codex active-session tail drift is softer: status may report freshness: "stale" with staleReason: "source_content_changed" and recommendedAction: "query" when an existing JSONL is still growing; query/read first, and sync only when the latest tail or a strict completeness claim matters.
The same distinction applies during sync: a Codex JSONL that only appends after its bounded read no longer aborts the whole run. Stable sources and the bounded prefix are committed, the successful sync summary marks coverage.staleReason: "source_content_changed", and the next sync fills the tail. Truncation, prefix rewrite/replacement, and source-set changes still fail strict sync.
If a new, unindexed Codex file already changed before its bounded read opened, Sherlog cannot prove that the old snapshot prefix was not rewritten. It conservatively defers that file and complete coverage, commits other stable sources, and returns coverage.reason: "active_source_deferred" with recommendedAction: "sync".
For project-scoped agent work, check and refresh only that coverage:
shlog status --cwd /Users/you/work/project --json
shlog sync --cwd /Users/you/work/project- Design Philosophy - Why FTS? Why not
ripgrepor embeddings? - Usage Guide - Full commands, selectors, sync, and storage details.
- Architecture - Retrieval model and how it works under the hood.
- Roadmap - What's coming next.
- Agent Rules - Project rules and contribution notes.