prompt-tracker

A Claude Code plugin that logs every prompt and the code diff it produces. Built for analyzing Claude Code's response accuracy.

What it does

Every time you send a prompt to Claude Code that results in code changes, this plugin records:

• Your exact prompt text
• The git diff of all code changes (committed + uncommitted + new files)
• Timestamps (prompt submitted, Claude stopped)
• Files changed list and count
• Git HEAD before and after

Prompts that don't produce code changes are skipped.

Install

# Add as a marketplace source
/plugin marketplace add your-github-username/prompt-tracker-plugin

# Install the plugin
/plugin install prompt-tracker

Or test locally:

claude --plugin-dir /path/to/prompt-tracker-plugin

Usage

The plugin works automatically in the background. Just use Claude Code normally in any git repo.

View logs

Use the slash command:

/prompt-tracker:view-log              # today's entries
/prompt-tracker:view-log 2026-04-21   # specific date
/prompt-tracker:view-log --all        # all entries
/prompt-tracker:view-log --stats      # summary statistics
/prompt-tracker:view-log --json       # raw JSONL for scripting

Log format

Logs are stored as JSONL at ~/.prompt-tracker/logs/YYYY-MM-DD.jsonl (or in the plugin data directory if installed via marketplace).

Each line is a JSON object:

{
  "session_id": "abc123",
  "prompt": "add error handling to the upload function",
  "prompt_timestamp": "2026-04-21T14:30:00Z",
  "stop_timestamp": "2026-04-21T14:31:15Z",
  "cwd": "/home/user/my-project",
  "head_before": "a1b2c3d4",
  "head_after": "e5f6g7h8",
  "diff": "--- a/upload.js\n+++ b/upload.js\n...",
  "files_changed": ["upload.js"],
  "file_count": 1,
  "new_files": []
}

Requirements

• jq (for JSON processing)
• git (diffs are git-based)
• Only works inside git repositories

How it works

Two hooks:

1. UserPromptSubmit — fires when you send a prompt. Snapshots the git state (HEAD rev, baseline diff, untracked files).
2. Stop — fires when Claude finishes. Computes the diff between the snapshot and current state, subtracts any pre-existing changes, and logs the entry.

License

MIT