Claude · Schema

Tool

Definition of a tool that the model can use.

Artificial IntelligenceChatbotConversational AIGenerative AILarge Language ModelsMachine LearningNatural Language Processing

Properties

Name	Type	Description
name	string	The name of the tool. Must match the regex ^[a-zA-Z0-9_-]{1,64}$.
description	string	A detailed description of what the tool does, when it should be used, and what each parameter means.
input_schema	object	JSON Schema object defining the expected parameters for the tool.
type	string	The type of tool. Omit for custom tools. Use specific type strings for server tools like web_search_20260209, code_execution_20260120, text_editor_20250728, etc.

View JSON Schema on GitHub

JSON Schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "Tool",
  "type": "object",
  "description": "Definition of a tool that the model can use.",
  "properties": {
    "name": {
      "type": "string",
      "description": "The name of the tool. Must match the regex ^[a-zA-Z0-9_-]{1,64}$."
    },
    "description": {
      "type": "string",
      "description": "A detailed description of what the tool does, when it should be used, and what each parameter means."
    },
    "input_schema": {
      "type": "object",
      "description": "JSON Schema object defining the expected parameters for the tool."
    },
    "type": {
      "type": "string",
      "description": "The type of tool. Omit for custom tools. Use specific type strings for server tools like web_search_20260209, code_execution_20260120, text_editor_20250728, etc."
    }
  }
}