simboba 0.1.3

A lightweight tool for generating annotated eval datasets and running LLM-as-judge evaluations

simboba

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Lightweight eval tracking with LLM-as-judge. Run evals as Python scripts, track results as git-friendly JSON files, view in a web UI. Designed for 1-click setup with your favourite AI coding tool.

Installation

pip install simboba

Quick Start

boba init          # Create boba-evals/ folder with templates
boba magic         # Prompt for your AI tool to set up and run your first eval
boba run           # Run your evals (handles Docker automatically)
boba baseline      # Save run as baseline for regression detection
boba serve         # View results at http://localhost:8787

Commands

Command	Description
boba init	Create boba-evals/ folder with starter templates
boba magic	Print detailed prompt for AI coding assistant
boba run [script]	Run eval script (default: test_chat.py). Handles Docker automatically
boba baseline	Save a run as baseline for regression detection
boba serve	Start web UI to view results
boba datasets	List all datasets
boba generate "description"	Generate a dataset from a description
boba reset	Clear run history (keeps datasets and baselines)

Writing Evals

Evals are Python scripts. Edit boba-evals/test_chat.py:

from simboba import Boba
from setup import get_context, cleanup

boba = Boba()

def agent(message: str) -> str:
    """Call your agent and return its response."""
    ctx = get_context()
    response = requests.post(
        "http://localhost:8000/api/chat",
        json={"user_id": ctx["user_id"], "message": message},
    )
    return response.json()["response"]

if __name__ == "__main__":
    try:
        # Option 1: Single eval
        boba.eval(
            input="Hello",
            output=agent("Hello"),
            expected="Should greet the user",
        )

        # Option 2: Run against a dataset
        # boba.run(agent, dataset="my-dataset")

        print("Done! Run 'boba serve' to view results.")
    finally:
        cleanup()

Regression Detection

Track regressions across code changes:

# Run evals and compare to baseline
boba run
# Output shows regressions: "REGRESSIONS: 2 cases now failing"

# Save current results as new baseline
boba baseline
# Commit to git for tracking
git add boba-evals/baselines/
git commit -m "Update eval baseline"

Creating Datasets

Via CLI

boba generate "A customer support chatbot for an e-commerce site"

Via Web UI

1. boba serve
2. Click "New Dataset" -> "Generate with AI"
3. Enter a description of your agent and we'll create test cases for you.

Via API

from simboba import Boba
boba = Boba()
boba.run(agent, dataset="my-dataset")  # Uses dataset created above

Test Fixtures (setup.py)

Edit boba-evals/setup.py to create test data your agent needs:

def get_context():
    """Create test fixtures, return context dict."""
    user = create_test_user(email="[e-mail]")
    return {
        "user_id": user.id,
        "api_token": user.generate_token(),
    }

def cleanup():
    """Clean up test data after evals."""
    delete_test_users()

Environment Variables

Boba loads .env automatically. Set your LLM API key for judging (Claude Haiku 4.5 is the default):

ANTHROPIC_API_KEY=sk-ant-...   # Required for default model (Claude)
OPENAI_API_KEY=sk-...          # For OpenAI models
GEMINI_API_KEY=...             # For Gemini models

Note: Without an API key, boba falls back to a simple keyword-matching judge which is less accurate.

Project Structure

your-project/
├── boba-evals/
│   ├── datasets/           # Dataset JSON files (git tracked)
│   ├── baselines/          # Baseline results (git tracked)
│   ├── runs/               # Run history (gitignored)
│   ├── files/              # Uploaded attachments
│   ├── setup.py            # Test fixtures
│   ├── test_chat.py        # Your eval script
│   ├── settings.json       # Configuration
│   └── .boba.yaml          # Runtime config (docker vs local)
└── ...

Future Updates

• File Uploads - Allow uploads via UI to help create datasets
• Eval methods - Built-in evaluation strategies beyond LLM-as-judge
• Cloud storage - Sync datasets and runs to the cloud for team collaboration

Development

To work on the web UI:

cd frontend
npm install
npm run dev      # Dev server with hot reload (proxies to localhost:8787)
npm run build    # Build to simboba/static/

Run boba serve in another terminal to start the backend.

License

MIT