05 Custom Tool

Script: example/05_custom_tool.py.

This script implements a deterministic calculator by subclassing FlowToolCall. The model chooses when to call it; the tool itself is local Python code.

python example/05_custom_tool.py

Method/member	Role
name	OpenAI function tool name.
description	Model-visible tool description.
parameters	JSON Schema, generated from a Pydantic model.
__call__(session, arguments)	Runtime execution.
parallel_safe=True	Lets the async runtime group this pure tool separately.

The script avoids eval; it parses arithmetic with ast and a small operator whitelist.

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