AI Tool Schema Builder
Build function-calling schemas for OpenAI, Claude, Gemini, MCP and the AI SDK.
Tool definition
All properties required, no extras
Generated schema
About the AI Tool Schema Builder
Describe a tool and its parameters in a form, then export the exact shape each platform expects: OpenAI function calling with strict mode, Anthropic input_schema, Gemini function declarations, MCP inputSchema, or a ready-to-paste Vercel AI SDK tool with a Zod schema.
Examples
Weather tool
name: get_weather, params: city, unitOutput
{ "type": "function", "function": { … } }Keyboard shortcuts
- Copy the main outputCtrl / ⌘ + Shift + C
- Download the resultCtrl / ⌘ + S
- Share this toolCtrl / ⌘ + Shift + S
- Reset the inputsAlt + R
- Open the tool search paletteCtrl / ⌘ + K
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Frequently asked questions
Version 1.0.0 · Updated 2026-08-14 · Runs entirely in your browser