Claude Code usage tracking by LangWatch

In plain words

LangWatch is a developer tool that tracks Claude Code session costs and usage details. Users run a single command to monitor spending, including cache reads and writes as separate token categories, bash commands, and MCP calls. The tool displays theoretical versus billed costs for Max plan users and provides a full terminal replay feature for debugging. It also works with Codex and is open source.

written from the facts on this page · September 2026

From the sources

Track Claude Code usage: cost, cache, session replay. Run `npx langwatch claude` once. Every session gets cost with cache reads/writes as separate token classes, every bash and MCP call as a span, theoretical vs billed for your Max plan, and a full terminal replay in the UI. Works for Codex too.

Full trace history for Claude Code, Codex, OpenCode, Copilot, Cursor, and Pi. Tokens by class including cache reads, and theoretical spend on bundled plans.

Or Codex , OpenCode , Copilot , Cursor and Pi . Capture full trace history to improve your flow, and track how much you're spending in tokens. Input I did the gcloud auth login hopefully you can continue? Output The scan came back empty: **no project in your account has the Google Ads API enabled at all**, which actually pins the diagnosis. Modern Ads API accounts declare their Cloud project explicitly in th… Input ok merged! but /reuse-worktree cuz already found a bug Output Worktree reset to latest main on a fresh branch. The bug reproduces: the retry queue drops the last event when the worker restarts. Writing the failing test first, fix goes on the same PR… Output Both errors share one…from langwatch.ai

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