should_create_session_with_custom_tool.yaml

models:
  - claude-sonnet-4.5
conversations:
  - messages:
      - role: system
        content: ${system}
      - role: user
        content: What is the secret number for key ALPHA?
      - role: assistant
        tool_calls:
          - id: toolcall_0
            type: function
            function:
              name: get_secret_number
              arguments: '{"key":"ALPHA"}'
      - role: tool
        tool_call_id: toolcall_0
        content: "54321"
      - role: assistant
        content: The secret number for key ALPHA is **54321**.