Show HN: A minimal Pareto-optimal OpenRouter model router for pi, based on Jev

Jev-classified model routing for pi.

Writing tasks get STE and Humanizer rules. Code tasks run unit tests. Planning tasks get a structure check.

/router          show status
/router shadow   recommend only (default)
/router auto     switch models per task
/router off      stop routing
/router profile pareto_code | empirical_cost
/router budget <usd>
node --experimental-strip-types eval/index.ts

Results: writing 89% cheaper. Code 88% cheaper with empirical_cost. Planning 100% pass on claude-sonnet-5.

npm install

Set OPENROUTER_API_KEY, or reuse the key stored in ~/.pi/agent/auth.json. Copy config/models.openrouter.json into ~/.pi/agent/models.json.

Auto-load globally:

mkdir -p ~/.pi/agent/extensions
ln -sf ~/Documents/GitHub/pi-jev-router ~/.pi/agent/extensions/pi-jev-router

Then start pi normally (no -e required).

Workers dispatched via dispatch_task execute in isolated Git worktrees:

• Worker edits code on a separate task branch (task/<id> ).

• If verifierCommand passes (exit 0), changes merge cleanly into the repository.

• If verification fails or aborts, the worktree is cleaned up without leaving dirty changes.

• src/classifier.ts — Jev call. One request, five questions.

• src/selector.ts — policy. No model calls.

• src/board.ts — SQLite task state.

• src/dispatch.ts — worker spawn and handshake.

• extensions/router.ts — pi hooks and commands.

• eval/ — benchmark tasks, verifiers, runner.