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CLAUDE.md Generator
Few-Shot Example Set Builder
MCP Config Wizard
System Prompt Generator
Prompt Optimizer
RAG Chunking & Retrieval Planner
ReAct Prompt Converter
Skill File Generator
Structured Output Schema Builder
Subagent & Slash Command Generator
Tool / Function Schema Generator
Workflow to Agent Blueprint
Free tool
Tool / Function Schema Generator
Turn a plain-language tool description into a valid schema — with the "when NOT to use this" clause that's usually missing, error-shape guidance, and trigger test cases.
Get started-
Always includes an explicit "when NOT to use this" clause in the description — the most common omission, and the main cause of a model calling a tool when it shouldn't.
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The generated JSON is checked for real, client-side, the moment it's generated — never a self-reported "this is valid" from the model.
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One click sends the schema to the Token Counter for its exact token count and per-call cost, since tool definitions are billed on every single request.
Frequently asked questions
This tool is powered by Claude (Anthropic).
Anthropic tool use, OpenAI function calling, and the Model Context Protocol (MCP) tool format — pick the one your integration actually uses; the generated schema, field names, and nesting match that format exactly.
A model decides whether to call a tool almost entirely from its description. A description that only says what the tool does — never what it's NOT for — is the single most common cause of a tool getting called on requests it was never meant to handle, or ignored on ones it should have handled.
No. Answer the questions, get your schema, and download or copy it. An email address is required to generate the file and enforce a fair-use daily limit; no account is created.