harness-token-trace is a Python package that decomposes token usage and associated costs on a per-API-call basis. It is designed specifically for developers working with Claude Code, Claude desktop agents, and the Cursor AI code editor. The tool provides detailed observability into LLM token consumption and spend to help track and optimize costs.
harness-token-trace sits in PulseGate's LLM eval & observability category. It focuses on understanding and breaking down exact token costs and usage per API call when using Claude-based coding agents. It is built as an open-source project for developers. harness-token-trace is open source under the MIT License. It runs on the command line and API.
harness-token-trace first shipped in 2026. Key capabilities include Token Cost Decomposition, Per-Call Breakdown, and Claude Integration.
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