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evo-agent (Node SDK)

Lightweight reporting SDK for evo experiments. Zero dependencies, ESM-only, Node 18+.

Mirrors the evo-agent Python SDK surface: Run for per-task logging + scoring, Gate for safety checks with exit codes.

Install

npm install @evo-hq/evo-agent

Usage

Benchmark (Run)

import { Run } from '@evo-hq/evo-agent';

const run = new Run();
for (const task of tasks) {
  run.log(task.id, 'starting task');
  const result = await evaluate(task);
  run.log(task.id, { output: result.output });
  run.report(task.id, {
    score: result.score,
    summary: `reward=${result.score.toFixed(2)}`,
    failureReason: result.passed ? undefined : 'task_failed',
  });
}
await run.finish();

On finish():

• Prints the score JSON to stdout (the contract evo reads).
• Per-task trace files are written to $EVO_TRACES_DIR as each report() is called.

Gate

import { Gate } from '@evo-hq/evo-agent';

const gate = new Gate();
for (const task of criticalTasks) {
  const result = await evaluate(task);
  gate.check(task.id, { score: result.score, detail: `reward=${result.score.toFixed(2)}` });
}
gate.finish();  // exits 0 if all passed, 1 otherwise

Environment

• EVO_TRACES_DIR directory where task_<id>.json files are written (set by evo run)
• EVO_EXPERIMENT_ID experiment label embedded in each trace

Both are set automatically when the evo CLI spawns your benchmark. Missing vars are tolerated -- traces are just skipped.