GET /api/agents

POST /api/agents

{
  "name": "Research Assistant",
  "model": "gpt-4o",
  "tools": ["browser", "file_system"],
  "system_prompt": "You are a research assistant..."
}

POST /api/agents/:id/messages

{
  "content": "Research the AI agent market in 2026"
}

GET /api/agents/:id/messages