Rewardkit

Help the user write task verifiers with Reward Kit. Reward Kit is a lightweight Python package that turns a directory of criteria files into a reward score. Each criterion is a Python function call or a TOML judge file; folders become separate rewards.

Setup in a Harbor task

Put criteria alongside test.sh in the task's tests/ directory:

tests/
├── test.sh
├── checks.py         # programmatic criteria
└── judge.toml        # optional LLM/agent judge

tests/test.sh:

#!/bin/bash
uvx --python '>=3.12,<3.14' --from 'harbor-rewardkit==0.2.*' rewardkit /tests

This runs all criteria in /tests/ against the workspace at /app and writes /logs/verifier/reward.json. Defaults match Harbor's conventions — no extra config needed.

If judge criteria need API keys, pass them through task.toml:

[verifier.env]
ANTHROPIC_API_KEY = "${ANTHROPIC_API_KEY}"

Ask whether Reward Kit should run in the agent's shared environment or in a separate verifier environment. Prefer a separate verifier environment when judge prompts, grading dependencies, API keys, or clean-room checks should not be available to the agent: