OpenAPI to AI Tool Schema

Turn OpenAPI 3.x operations into strict function tools for the Responses API or MCP-compatible tool definitions.

Target format

Generated tools

OpenAPI JSON or YAML

Generated tool definitions

[
  {
    "type": "function",
    "name": "get_project",
    "description": "Get a project by ID",
    "parameters": {
      "type": "object",
      "properties": {
        "project_id": {
          "type": "string",
          "description": "path parameter"
        },
        "include_tasks": {
          "type": "boolean",
          "description": "query parameter"
        }
      },
      "required": [
        "project_id"
      ],
      "additionalProperties": false
    },
    "strict": true
  },
  {
    "type": "function",
    "name": "update_project",
    "description": "Update project fields",
    "parameters": {
      "type": "object",
      "properties": {
        "project_id": {
          "type": "string",
          "description": "path parameter"
        },
        "body": {
          "type": "object",
          "properties": {
            "name": {
              "type": "string"
            },
            "status": {
              "type": "string",
              "enum": [
                "active",
                "archived"
              ]
            }
          },
          "additionalProperties": false,
          "description": "JSON request body"
        }
      },
      "required": [
        "project_id",
        "body"
      ],
      "additionalProperties": false
    },
    "strict": true
  }
]

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About OpenAPI to OpenAI Function & MCP Tool Converter

Convert OpenAPI JSON or YAML operations into strict OpenAI function tools or MCP tool definitions, including parameters and request body schemas.

How to use OpenAPI to AI Tools

1Paste an OpenAPI JSON or YAML document.
2Choose OpenAI function tools or MCP definitions.
3Review generated names, descriptions, parameters, and required fields.
4Copy or download the tool array.

Frequently Asked Questions

Which OpenAPI versions are supported?

The converter is designed for OpenAPI 3.x JSON or YAML documents with operations under paths.

What becomes a tool parameter?

Path, query, and header parameters become top-level properties. An application/json request body becomes a body property.

What is strict mode?

Strict function schemas declare required fields and disallow unspecified top-level parameters, helping models produce predictable tool arguments.

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