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Pi evals
Behavioral evaluations for Pi using vitest-evals.
The Pi harness in src/pi-harness.ts is built on createHarness from vitest-evals/harness. It drives a real
createAgentSession in a temporary workspace and reports the final assistant message, transcript, and token usage.
Running
From the repository root, run with an explicit provider and model:
npm run eval -- --provider openai-codex --model gpt-5.4
When invoked from a Pi Bash tool, the current session supplies PI_PROVIDER and PI_MODEL, so this is sufficient:
npm run eval
The runner requires both values and never falls back to another model. Additional arguments are forwarded to Vitest, for example:
npm run eval -- -t "capital of France"
Authentication is resolved by Pi's normal ModelRuntime. Subscription-backed providers such as openai-codex use credentials from the user's Pi configuration. API-backed providers use their standard environment variables, such as OPENAI_API_KEY for openai.