Parameter Types, Tool Descriptions, and Additional Customization
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FastMCP Annotations
Annotations are just metadata and don't affect the tool's behavior on the server. However, they can be used by humans and LLMs to understand the tool's intended use and constraints. Here are some commonly used annotations:
title(string) — A human-readable title for the tool.readOnlyHint(boolean, default false) — If true, the tool does not modify its environment.destructiveHint
Practical MCP with FastMCP & LangChain
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