AI Tool Schema Builder

Export as:
Schema Properties

No properties yet

Raw JSON Schema

Enter a tool name and add properties to generate schema...

Export Formats

JSON Schema

Standard JSON Schema (draft-07) format for validation and documentation.

OpenAI Function

OpenAI function calling format with name, description, and parameters.

Anthropic Tool

Anthropic Claude tool use format with input_schema for tool definitions.

MCP Tool

Model Context Protocol tool definition format with inputSchema.

Tip: Already have example JSON? Use the JSON Schema Generator to auto-generate schemas from JSON examples.

What This Tool Does

AI Tool Schema Builder is built for deterministic developer and agent workflows.

Visual schema builder for AI tool definitions with export to OpenAI, Anthropic, MCP, and JSON Schema formats.

Use How to Use for execution steps and FAQ for constraints, policies, and edge cases.

Last updated:

This tool is provided as-is for convenience. Output should be verified before use in any production or critical context.

Agent Invocation

Best Path For Builders

Browser workflow

Runs instantly in the browser with private local processing and copy/export-ready output.

Browser Workflow

This tool is optimized for instant in-browser execution with local data handling. Run it here and copy/export the output directly.

/ai-tool-schema-builder/

For automation planning, fetch the canonical contract at /api/tool/ai-tool-schema-builder.json.

How to Use AI Tool Schema Builder

  1. 1

    Define tool name and description

    Enter a tool name (e.g., 'search_database') and description (what it does). This is how the AI understands the tool's purpose.

  2. 2

    Build parameters with form fields

    Click '+ Add Property' to add input parameters. For each: set name, type (string, number, boolean, array, object, enum), mark required, add description. Use up/down arrows to reorder.

  3. 3

    Configure nested structures

    For object or array types, click '+ Add nested property' to define sub-fields (up to 3 levels deep). Set enum values as comma-separated list.

  4. 4

    Add validation rules

    Set min/max constraints, regex patterns, enum values, and conditional logic (e.g., if X then require Y).

  5. 5

    Generate and export

    Export the completed schema as JSON Schema, OpenAPI format, or TypeScript types. Use in LLM tools, Zod, or API validators.

Frequently Asked Questions

What is AI Tool Schema Builder?
AI Tool Schema Builder is a visual editor for creating AI tool definitions. It exports to OpenAI function calling, Anthropic tool use, MCP tool format, and standard JSON Schema.
How do I use AI Tool Schema Builder?
Add parameters using the visual form — set names, types, descriptions, and required flags. The tool generates the complete schema in your chosen format, ready to paste into your AI application code.
Is AI Tool Schema Builder free?
Yes. This tool is free to use with immediate access—no account required.
Does AI Tool Schema Builder store or send my data?
No. All processing happens entirely in your browser. Your schema definitions stay on your device — nothing is sent to any server.
What output formats does AI Tool Schema Builder support?
It exports to OpenAI function calling format, Anthropic tool use format, Model Context Protocol (MCP) tool definitions, and standard JSON Schema. Each format is ready to use with the respective API.