Open Source AI Harness Profiler – discover where tf your tokens are going

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A transparent proxy for the Anthropic and OpenAI APIs that records token usage and shows it in a dashboard. Point your client at it, keep working as normal, and see per-request tokens, reconstructed sessions, tool-level attribution, and estimated cost.

Built on Cloudflare Workers, D1, Hono, and React.

A hosted instance runs at tryrekon.com.

Features

Zero added latency — responses stream straight through; recording happens off the critical path.

Keys never stored — auth headers are forwarded, never held, so usage is always spent on the caller's own key or subscription.

Session trees — the chat APIs are stateless, so the proxy rebuilds each conversation from client signals, forks and all.

Tool-level attribution — see which tools actually burn the tokens.

How it works

Create a system in the dashboard and it gets its own proxy URL. Point your client at it with one environment variable:

export ANTHROPIC_BASE_URL=https:///s/

OpenAI clients add /openai/v1:

export OPENAI_BASE_URL=https:///s//openai/v1

Requests are forwarded untouched (auth headers included) and usage is recorded on the way back. The system id doubles as the ingest key — unknown ids are rejected, so a deployment is never an open relay. Treat the URL as a secret.

Quick start

git clone https://github.com/TryRekon/Rekon.git cd Rekon npm install

cp .dev.vars.example .dev.vars # set SESSION_SECRET + one OAuth provider (Google or GitHub) npm run typegen npm run db:migrate:local npm run dev # http://localhost:5173

Sign in, copy your system's URL from the onboarding screen, and point a client at it. Recording starts with the first request.

To deploy your own: create a D1 database (wrangler d1 create token-profiler-db) and paste its id into wrangler.jsonc as database_id, then change the routes custom-domain pattern to a zone you control (or remove it for a free workers.dev URL). Set your secrets with wrangler secret put (SESSION_SECRET, an OAuth provider pair, and POSTHOG_KEY if you want analytics), run npm run db:migrate:remote, then npm run deploy. Note that deploy does not run migrations.

Costs are estimates from list prices in shared/pricing.ts; unknown models show no cost.

Docs

The architecture — session reconstruction, token attribution, the endpoint list, and a file-by-file layout — is in AGENTS.md.

License

Apache 2.0. This repository is, and will remain, fully open source; the commercial model is a hosted deployment, not a paywall over this code.

Contributions are accepted under the DCO — sign off your commits with git commit -s.

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