Agent Playground

Test Custom Agents

Submit a markdown agent definition and test it against the Lumo API. Define your agent's personality, behavior, and rules then see how it responds.

Format Guide

Agent Markdown Format

Create your agent as a markdown file with the following structure:

markdown — agent.md

---
name: My Custom Agent
description: A focused AI assistant for...
model: auto
---

## System Prompt

You are a specialized AI assistant. Define the agent's personality, behavior, rules, and knowledge here.

- Be specific about tone and constraints
- Include examples of desired output
- Set boundaries for what the agent should refuse

The parser extracts name, description, and model from frontmatter or inline. The ## System Prompt section becomes the system instruction sent to the API.

Lumo API Agent Test | test custom agents against the live API · Tracker