Tool Server Protocol

GET /tools

{
  "tools": [
    {
      "name": "send_email",
      "description": "Send an email to the specified recipient.",
      "parameters": {
        "type": "object",
        "properties": {
          "to": { "type": "string", "description": "Recipient email address" },
          "subject": { "type": "string", "description": "Email subject line" },
          "body": { "type": "string", "description": "Email body text" }
        },
        "required": ["to", "subject", "body"]
      }
    }
  ]
}

POST /step

{
  "action": {
    "tool_name": "send_email",
    "parameters": {
      "to": "candidate@example.com",
      "subject": "Interview Scheduling",
      "body": "Hello, we'd like to schedule..."
    }
  }
}

{
  "observation": "Email sent successfully to candidate@example.com"
}

{
  "observation": "Error: invalid email address format",
  "is_error": true
}