cq

Query past Claude Code sessions using the cq CLI (SQL over session transcripts via DuckDB). You MUST use this skill whenever the user asks about their Claude session history, tool usage, errors, or past commands. This includes questions like "what tools have I used", "how many sessions today", "what was that command I ran", "show me errors", "which files have I been editing", "what skills get invoked", or any question about what happened in previous Claude Code sessions. Also use when doing meta-work (skill development, plugin analysis, workflow review) where querying past session data would be informative. If the user mentions sessions, transcripts, tool calls, or wants to recall something from a past conversation, this is the skill to use.

Build, run, test, and smoke-drive cq — the SQL-over-Claude-Code-transcripts CLI (Rust + DuckDB). Use when asked to build cq, run it, try a subcommand, verify a change works end-to-end, or run its tests.