What it does
The same harness ships for Python, TypeScript and Rust, with an offline heuristic mode for trying the workflow without a live decision service.
Agent tooling
Jev Harness
Five small gates help coding agents triage failures, stop doomed work, route models, verify steps and choose reasoning effort.
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How you can use it
A developer can use this tool to review test failures in your software. They feed an error log into the included command line program. The program asks an outside AI service called TypeSafe to read the error. TypeSafe then decides if the mistake needs a complex fix or a quick correction.
This live review requires an access key that connects the software to TypeSafe. If you do not provide this connection key, the tool still runs. It will use a built-in offline mode to guess the answer instead. Very long error logs are automatically cut down to fit the service limits.