---
title: "Running from CLI"
description: "Wire evaluators into an eval workflow and run them against datasets from the CLI"
---

Once you've written evaluators with `verify()` and `Verdict`, you need an eval workflow that ties them together. The eval workflow defines which evaluators to run, how to interpret their results, and whether each one is required or informational.

## Creating an Eval Workflow

`evalWorkflow()` connects your evaluators and tells the framework how to interpret their results. The eval workflow file lives at `tests/evals/workflow.ts` inside your workflow directory.

A minimal example with one evaluator:

```typescript tests/evals/workflow.ts
import { evalWorkflow } from '@outputai/evals';
import { evaluateSum } from './evaluators.js';

export default evalWorkflow( {
  name: 'simple_eval',
  evals: [
    {
      evaluator: evaluateSum,
      criticality: 'required',
      interpret: { type: 'boolean' }
    }
  ]
} );
```

A more realistic example mixing deterministic checks and LLM judges:

```typescript tests/evals/workflow.ts
import { evalWorkflow } from '@outputai/evals';
import {
  lengthOfOutput,
  evaluateTopic,
  evaluateQuality,
  evaluateContent,
  evaluateTone
} from './evaluators.js';

export default evalWorkflow( {
  name: 'blog_generator_eval',
  evals: [
    {
      evaluator: lengthOfOutput,
      criticality: 'required',
      interpret: { type: 'boolean' }
    },
    {
      evaluator: evaluateTopic,
      criticality: 'required',
      interpret: { type: 'verdict' }
    },
    {
      evaluator: evaluateQuality,
      criticality: 'required',
      interpret: { type: 'number', pass: 0.7, partial: 0.4 }
    },
    {
      evaluator: evaluateContent,
      criticality: 'informational',
      interpret: { type: 'boolean' }
    },
    {
      evaluator: evaluateTone,
      criticality: 'informational',
      interpret: { type: 'string', pass: [ 'professional', 'informative' ], partial: [ 'casual' ] }
    }
  ]
} );
```

Each entry in the `evals` array has three fields:

| Field | Type | Default | Description |
|-------|------|---------|-------------|
| `evaluator` | Function | — | An evaluator created with `verify()` |
| `criticality` | `'required' \| 'informational'` | `'required'` | Whether failure should fail the case |
| `interpret` | `InterpretConfig` | — | How to convert the raw result to a verdict |

### Criticality

- **`required`** (default): If this evaluator fails, the entire case fails. Use for checks that gate quality — topic relevance, minimum length, factual accuracy.
- **`informational`**: Failure is reported but doesn't affect the case verdict. Use for metrics you want to track without gating on — tone classification, style scores, auxiliary checks.

### Interpret Types

Your evaluators return raw values (booleans, numbers, strings, verdicts). The `interpret` config tells the framework how to convert those into pass/partial/fail:

| Type | Config | Pass | Partial | Fail |
|------|--------|------|---------|------|
| `boolean` | `{ type: 'boolean' }` | `value === true` | — | `value === false` |
| `verdict` | `{ type: 'verdict' }` | `value === 'pass'` | `value === 'partial'` | `value === 'fail'` |
| `number` | `{ type: 'number', pass: 0.7, partial: 0.4 }` | `value >= 0.7` | `value >= 0.4` | `value < 0.4` |
| `string` | `{ type: 'string', pass: ['a', 'b'], partial: ['c'] }` | `value in ['a', 'b']` | `value in ['c']` | otherwise |

The `partial` threshold is optional for both `number` and `string` types — omit it to have only pass and fail.

### Case Verdict Aggregation

Each dataset case runs all evaluators. The case-level verdict follows these rules:

1. If any **required** evaluator fails, the case **fails**
2. Else if any **required** evaluator is partial, the case is **partial**
3. Otherwise, the case **passes**

Informational evaluators never affect the case verdict.

## Running Evals from the CLI

The `output workflow test` command runs your eval workflow against [datasets](/evaluators/datasets).

### Common Commands

```bash
# Run evals using cached output (no workflow re-execution)
output workflow test blog_generator --cached

# Run evals with fresh workflow execution and save results
output workflow test blog_generator --save

# Run specific datasets only
output workflow test blog_generator --dataset happy_path,edge_case
```

### Flags

| Flag | Default | Description |
|------|---------|-------------|
| `--cached` | `false` | Use cached output from `last_output` in datasets, skip workflow execution |
| `--save` | `false` | Run workflow fresh and save output/eval results back to dataset files |
| `--dataset` | all | Comma-separated list of dataset names to run |
| `--format` | `text` | Output format (`text` or `json`) |

Use `--cached` during development when iterating on evaluators — it's fast because it skips the workflow entirely. Use `--save` when you want to capture fresh output and eval results.

## Putting It All Together

Here's the complete setup for a blog generator workflow:

**1. Write evaluators** — mix deterministic checks and LLM judges:

```typescript tests/evals/evaluators.ts
import { verify, Verdict, judgeVerdict, judgeScore } from '@outputai/evals';
import { z } from '@outputai/core';

const blogInput = z.object( { topic: z.string() } );
const blogOutput = z.object( { title: z.string(), blog_post: z.string() } );

// Deterministic: check minimum length
export const lengthOfOutput = verify(
  { name: 'length_of_output', input: blogInput, output: blogOutput },
  ( { output, context } ) =>
    Verdict.gte( output.blog_post.length, Number( context.ground_truth.min_length ?? 100 ) )
);

// LLM judge: is the blog on-topic?
export const evaluateTopic = verify(
  { name: 'evaluate_topic', input: blogInput, output: blogOutput },
  async ( { input, output, context } ) =>
    judgeVerdict( {
      prompt: 'judge_topic@v1',
      variables: {
        blog_title: output.title,
        blog_post: output.blog_post,
        required_topic: String( context.ground_truth.required_topic ?? input.topic )
      }
    } )
);

// LLM judge: rate quality 0-1
export const evaluateQuality = verify(
  { name: 'evaluate_quality', input: blogInput, output: blogOutput },
  async ( { input, output } ) =>
    judgeScore( {
      prompt: 'judge_quality@v1',
      variables: {
        blog_title: output.title,
        blog_post: output.blog_post,
        topic: input.topic
      }
    } )
);
```

**2. Wire into an eval workflow:**

```typescript tests/evals/workflow.ts
import { evalWorkflow } from '@outputai/evals';
import { lengthOfOutput, evaluateTopic, evaluateQuality } from './evaluators.js';

export default evalWorkflow( {
  name: 'blog_generator_eval',
  evals: [
    { evaluator: lengthOfOutput, criticality: 'required', interpret: { type: 'boolean' } },
    { evaluator: evaluateTopic, criticality: 'required', interpret: { type: 'verdict' } },
    { evaluator: evaluateQuality, criticality: 'required', interpret: { type: 'number', pass: 0.7, partial: 0.4 } }
  ]
} );
```

**3. Create [datasets](/evaluators/datasets):**

```yaml tests/datasets/stripe_blog.yml
name: stripe_blog
input:
  topic: "Stripe the payment processor"
ground_truth:
  evals:
    length_of_output:
      min_length: 100
    evaluate_topic:
      required_topic: "Stripe the payment processor"
last_output:
  output:
    title: "Stripe: The Modern Payment Processing Platform"
    blog_post: "Stripe has revolutionized online payment processing..."
  executionTimeMs: 5000
  date: '2026-02-16T00:00:00.000Z'
```

**4. Run:**

```bash
output workflow test blog_generator --cached
```

## What's Next

- [Workflow Evaluators](/evaluators/workflow-evaluators) — Writing evaluators with `verify()`, Verdict helpers, and judge functions
- [Verdict Helpers](/evaluators/verdicts) — Complete reference for deterministic assertions and manual verdicts
- [Datasets](/evaluators/datasets) — Defining test cases with inputs and ground truth
- [LLM-as-a-Judge Best Practices](/evaluators/best-practices) — Writing effective judge prompts and choosing grading scales
- [`@outputai/evals` API Reference](/packages/evals) — Complete package reference
- [CLI Commands](/packages/cli#evaluation-commands) — Full CLI reference for eval and dataset commands
