{
  "tools": [
    {
      "type": "function",
      "function": {
        "name": "lookup_domain_fact",
        "description": "Look up a fact in the Agent's verified domain knowledge base. Use this before answering domain-specific factual questions.",
        "parameters": {
          "type": "object",
          "properties": {
            "query": {"type": "string", "description": "A concise lookup query."}
          },
          "required": ["query"],
          "additionalProperties": false
        }
      }
    }
  ]
}