Which formats are supported?

OpenAI tools[].function, Anthropic input_schema, Gemini functionDeclarations, MCP inputSchema and OpenAI-compatible runtimes such as Ollama, in both directions.

Can I paste a whole tools array?

Yes. Single objects, arrays, functionDeclarations wrappers and MCP tools/list responses are all detected automatically.

Is the JSON Schema modified?

No. The parameter schema is carried across untouched — only the surrounding envelope keys change.

Is my schema uploaded anywhere?

No. Conversion happens entirely in your browser; nothing is sent to a server.

Does it work offline and on mobile?

Yes. Once the page has loaded it keeps working without a network connection, and the layout is responsive so it stays usable on phones and tablets.

AI Tool Schema Converter

Convert function-calling schemas between OpenAI, Anthropic, Gemini and MCP.

Works Offline

Privacy First

No Login

No API

Convert to

Tools

Input schema (any provider)

Converted schema

[
  {
    "name": "get_weather",
    "description": "Get the current weather for a city.",
    "input_schema": {
      "type": "object",
      "properties": {
        "city": {
          "type": "string",
          "description": "City name"
        },
        "unit": {
          "type": "string",
          "enum": [
            "c",
            "f"
          ]
        }
      },
      "required": [
        "city"
      ],
      "additionalProperties": false
    }
  }
]

About the AI Tool Schema Converter

Paste a tool definition in any provider format and get it back in another: OpenAI tools[].function, Anthropic input_schema, Gemini functionDeclarations, MCP inputSchema or Ollama. Handles single tools, arrays and full tools/list responses.

Examples

OpenAI to Anthropic

{ "function": { "name": "get_weather" } }

Output

{ "name": "get_weather", "input_schema": {...} }

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 2026-08-15 · Runs entirely in your browser