Steer SDK

Active Reliability Layer for AI Agents.

Steer is an open-source Python library that intercepts agent failures (hallucinations, bad JSON, PII leaks) and allows you to inject fixes via a local dashboard without changing your code.

The Problem

When an agent fails in production (e.g., outputs bad JSON), logging the error isn't enough. You usually have to:

1. Dig through logs to find the prompt.
2. Edit your prompt template manually.
3. Redeploy the application.

The Solution

Steer wraps your agent function. When it detects a failure, it blocks the output and logs it to a local dashboard. You click "Teach" to provide a correction (e.g., "Use Strict JSON"), and Steer injects that rule into the agent's context for future runs.

Visual Workflow:

Installation

pip install steer-sdk

Quickstart

Generate the example scripts to see the workflow in action:

steer init
# Generates 01_structure_guard.py, 02_safety_guard.py, etc.

steer ui
# Starts the local dashboard at http://localhost:8000

Run a demo (Split-screen recommended):

1. Run python 01_structure_guard.py. It will fail (Blocked).
2. Go to http://localhost:8000. Click Teach. Select "Strict JSON".
3. Run python 01_structure_guard.py again. It will succeed.

Usage

Steer uses a decorator pattern to wrap your existing functions.

from steer import capture
from steer.verifiers import JsonVerifier

# 1. Define Verifiers
json_check = JsonVerifier(name="Strict JSON")

# 2. Decorate your Agent Function
@capture(verifiers=[json_check])
def my_agent(user_input, steer_rules=""):
    
    # 3. Pass 'steer_rules' to your system prompt.
    # Steer populates this argument automatically based on your teaching.
    system_prompt = f"You are a helpful assistant.\n{steer_rules}"
    
    # ... Your LLM call ...
    return llm.call(system_prompt, user_input)

Configuration

The Quickstart demos use a Mock LLM and require no API keys.

To use advanced LLM-based verifiers in production, set your environment variables:

export GEMINI_API_KEY=...
# OR
export OPENAI_API_KEY=...