I built *CCQL*, a CLI tool that lets you run SQL queries directly against your Claude Code data (history, transcripts, prompts, sessions, etc.).

If you use Claude Code regularly, you quickly accumulate a large amount of interaction data. CCQL makes that data queryable with SQL so you can analyze how you actually use the agent.

*Examples*

```bash # What tools does Claude use most? ccql "SELECT tool_name, COUNT() AS uses FROM transcripts GROUP BY tool_name ORDER BY uses DESC LIMIT 10"

# Find prompts mentioning a topic ccql "SELECT display, timestamp FROM history WHERE display LIKE '%authentication%'"

# Cross-session analysis ccql "SELECT _session_id, COUNT() FROM transcripts GROUP BY _session_id" ```

*Built-in commands*

```bash ccql prompts --session ses_123 ccql duplicates --threshold 0.8 ccql search "error" ```

*Interesting technical bit* Claude Code stores its data in a structured local format. CCQL loads that data into an embedded SQL engine (GlueSQL) with a clean, read-first model, so you can safely explore usage patterns without mutating anything.

*Features*

* SQL queries across history, transcripts, prompts, sessions, and todos * Fuzzy duplicate detection (find repeated or near-duplicate prompts) * Full-text search with regex * Safe writes with automatic backups * Output formats: table, JSON, JSONL

*Install*

```bash # macOS brew install douglance/tap/ccql

# npm (any platform) npx @douglance/ccql "SELECT * FROM history LIMIT 10"

# Cargo cargo install ccql ```

Built in Rust using GlueSQL. MIT licensed.

GitHub: [https://github.com/douglance/ccql](https://github.com/douglance/ccql)

I’ve been using this to understand my own Claude usage patterns—what prompts I repeat, which tools get called most, and how conversations evolve across sessions. Curious what queries others would find useful.

Show HN: CCQL – SQL Queries for Claude Code