| Key features | - 39 scientific models across mathematics, physics, chemistry, engineering, life sciences, economics and geospatial analysis
- 3,438 capabilities with worked examples and formulas
- Desktop app for Windows and Linux
- Command-line interface for scripts and terminal
- In-browser calculator on every model page
- Python packages via pip
- SpaceBuild for space system design with 146 products
- MachineBuild for engineering and mechanical design with 1,042 products
- Capability orb visualization of all 3,438 capabilities
- No internet or account required
| - Configure plugins, skills, MCP servers, and hooks in a single harness.yaml file
- Observatory: monitor every session, tool call, and minute of activity
- Memory: persistent knowledge graph for AI orientation
- Comparator: run prompts across Claude Code, Cursor, and Copilot side by side
- Import existing configs from multiple AI coding tools automatically
- Share complete setup via single file with teammates
- Harness Parity: verify all connected AI tools end up with identical configuration
- Cross-harness compatibility table showing actual tool capabilities
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| What makes it different | - Runs completely offline with no data sent anywhere
- Shows all working and formulas for every calculation
- No sign-up required or accounts needed
- Available as desktop app, CLI, browser, and Python package
- Models improve themselves through local research
| - Import-first approach: reads existing configs from all your tools and converges them before you write YAML
- No marketing gloss: capability table generated at build time from actual adapter code, not hand-maintained
- Portable across tools: single harness.yaml travels with you to every machine and tool
- Open source and free: no cost beyond existing Claude subscription
- Based on open specification: Harness Protocol is vendor-neutral and JSON Schema validated
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Harness Kit