@agent-inspect/harness

Fixture runner for tracing real projects locally (bootstrap → invoke → shutdown).

Support level: Supported — see SUPPORT-LEVELS.md.

When to use

• You have a real app (NestJS, Express, etc.) and want deterministic fixture runs
• CI or local recipes with stdin JSON fixtures

When not to use

• Simple scripts (use observe or inspectRun)
• Hosted test runners

Install

npm install agent-inspect @agent-inspect/harness

Example

import { createFixtureRunner, defineTarget } from "@agent-inspect/harness";

const runner = createFixtureRunner({
  name: "my-app",
  bootstrap: async () => app,
  shutdown: async (app) => app.close(),
});

runner.register(
  defineTarget({
    name: "chat",
    resolve: (app) => app.get(ChatService),
    invoke: async (target, input) => target.run(input),
  }),
);

await runner.runTarget("chat", { fixturePath: "fixtures/hello.json" });

Privacy

• Traces written locally via agent-inspect
• No default upload to AgentInspect

API

CLI

npx agent-inspect harness run · list-targets

Docs

• NestJS harness starter
• NESTJS.md

Troubleshooting

• bootstrap_failed: Check app module imports and env vars (use fixtures, not prod secrets)
• fixture_read_failed: Validate JSON fixture path

Version

Part of the fixed AgentInspect release line. See the npm badge / package manifest for the current version.

License

MIT