Queuelo: A Lightweight Approval API for LLM Agents

Queuelo is a lightweight approval API designed for LLM agents running in production. It provides a simple HTTP-based layer where agents can pause before executing potentially irreversible actions, requiring human approval.

How It Works

The system operates through a straightforward HTTP flow. Your LLM agent makes a POST request to Queuelo's API with action details. You receive a notification, review the request, and either approve or reject it. The agent then gets the decision back via webhook.

Technical Implementation

The API requires no specific frameworks or SDKs—just HTTP. Here's the example curl command from the source:

curl -X POST https://queuelo.com/api/actions \
   -H "Authorization: Bearer YOUR_API_KEY" \
   -H "Content-Type: application/json" \
   -d '{"action_type": "send_email", "summary": "Follow up with 500 leads", "risk_level": "high"}'

The request payload includes three fields: action_type (e.g., "send_email"), summary (a brief description), and risk_level (e.g., "high").

Compatibility

Queuelo works with any agent framework that can make HTTP requests, including LangChain, CrewAI, AutoGen, or raw API calls. The creator specifically mentions it's designed for "any agent framework" and "if it can make an HTTP request it can use Queuelo."

Availability

A free tier is available. The creator is actively seeking feedback on what action types people are using in production environments.