Paste a failed agent trace. The dragon walks every step, stops at the loop or the error, and tells you what it cost in tokens.
Runs in your browserNo LLMNothing uploaded
Paste it, or drop a .json / .jsonl file on the box
Examples
Reads OpenTelemetry spans (OpenInference or gen_ai.*: Arize Phoenix, Langfuse v3+, smolagents), LangChain / LangGraph dumps, OpenAI messages[] with tool_calls, and generic JSONL. Everything runs on this page; your trace is never uploaded.
Verdict
The trail
StepInside a loopErrorClick a stone to open that step