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Claude Agent Tracer

Paste a /v1/messages API response and instantly see token spend, loop pathologies, and a turn-by-turn breakdown — shareable as a PNG.

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Drag & drop a JSON file here

or paste your Claude API response in the box below

Summary

Turn-by-Turn Token Usage

Input tokens

Output tokens

Cache read

Pathology detected

Pathologies

Using Claude Code in a Next.js repo?

This tracer explains API responses. For instructions and hooks inside a Next.js App Router project, start with these separate resources. Nothing here changes how your trace is analyzed.

Start with a free Next.js CLAUDE.md template — adapt project commands and boundaries before your next coding session.
Diagnose a hook that is not firing — six checks and a free, locally testable file-protection sample.
Compare the free sample with the $15 workflow pack — the existing download adds hooks, subagents and a CLAUDE.md template; it is not a tracer upgrade or a hosted service.

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