$ class WordCountTool(FlowToolCall): ...

name=word_count
description=Count words and unique lowercase tokens in a short text.
parameters={
  "type": "object",
  "properties": {
    "text": {
      "type": "string",
      "description": "Text to count."
    }
  },
  "required": [
    "text"
  ],
  "additionalProperties": false
}
The tool executes in Python and returns a plain dict.