Anthropic Tool Input Builder
Build Claude tool definitions with `input_schema` from sample JSON input
Outputs a Claude tool definition entry with `name`, `description`, and `input_schema`.
Sample JSON
Generated Output
The schema is generated entirely in your browser from the sample you paste here. No provider APIs or server-side processing are involved.
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Frequently Asked Questions
It outputs a Claude tool definition object with `name`, `description`, and `input_schema`, ready to paste into the `tools` array of your Anthropic request.
Anthropic tool inputs are usually named parameters, so the schema should have an object root with properties rather than a raw string or array at the top level.
Yes. This page only generates the JSON definition. You still send that JSON from your own application when you call Anthropic, but the building step itself is entirely local.
Yes. This tool is focused specifically on Anthropic's `input_schema` wrapper. The broader builder also supports plain JSON Schema, OpenAI Structured Outputs, and MCP definitions.