Creates a new tool in the specified category. Idempotent: if a tool with
the given name already exists in the category, it is returned instead.
Usage
createTool(categoryId, toolName)
Arguments
- categoryId
Character. The ID of the tool category.
- toolName
Character. The name of the tool to create.
Value
A list with the tool details (id, name, categoryId), or NULL on failure.
