I had zero idea which of my 8 projects was burning the most AI tokens. Now I do.
I've been vibe coding hard 8 projects, Claude Code Max 20x plan, shipping fast.
Then I got curious about WHERE my tokens were going. Parsed through 77 sessions of JSONL logs and the numbers were wild.
The Data
| Project | Token Value | Sessions |
|---------|------------|----------|
| sdrPrompter | $955 | 28 |
| reddit-marketer | $512 | 5 |
| codeledger | $152 | 11 |
| growify | $147 | 20 |
| ideas | $105 | 3 |
| + 3 others | ~$190 | 10 |
| Total | $2,061 | 77 |
Other fun findings:
- 233 background agents I never asked for consumed 23% of my agent spend
- I was running Opus for file searches that's like using a Ferrari to fetch groceries
- Potential savings if I'd used the right model for each task: $1,748
The Problem
Claude Code gives you /cost for the current session. Close the terminal and that's gone. No history. No per-project view. No per-agent view.
What I Built
CodeLedger — an open-source Claude Code plugin that tracks per-project, per-agent, and per-session token usage.
How it works:
- Hooks into
SessionEndevents to parse local JSONL session files - Background scanner catches sessions where hooks weren't active
- Stores everything in local SQLite (
~/.codeledger/codeledger.db) — your machine only, no cloud - Exposes MCP tools you can query conversationally "what did project X cost this week?"
Features:
- Per-project cost breakdown
- Per-agent token tracking (which agents are expensive)
- Overhead detection (separates YOUR agents from background system agents)
- Model optimization tips (tells you where Sonnet would've been fine instead of Opus)
/codeledgerslash command for quick summaries
Tech stack: TypeScript, better-sqlite3, @modelcontextprotocol/sdk, tsup, vitest
Install:
npm install -g codeledger
Links
What's Next
- Local web dashboard (localhost) for visual analytics
- Category classification (what kind of work costs the most)
- Team dashboard for engineering managers
This is v0.2.6. Still early. Would love feedback what would you want to see tracked? What's confusing? What sucks?
