OpenAPI Tool Builder FAQs

Question 1

How does it process OpenAPI specifications?

Accepted Answer

It leverages battle-tested `kin-openapi` parsing with full `$ref` resolution. It then filters operations based on tags (e.g., `mcp`) or OpenAPI extensions (`x-mcp-*`) to generate MCP tool schemas and serve them to clients.

Question 2

What is the OpenAPI Tool Builder?

Accepted Answer

The OpenAPI Tool Builder automatically converts your OpenAPI-documented API endpoints into Model Context Protocol (MCP) tools, making them discoverable and usable by AI agents like Claude Desktop.

Question 3

Can I control which API operations become tools and how they are named?

Accepted Answer

Yes, you have fine-grained control. You can use tag-based filtering (like the `mcp` tag) and OpenAPI extensions such as `x-mcp-tool-name`, `x-mcp-description`, and `x-mcp-hidden` to customize tool generation.

Question 4

Is the setup complex, requiring code generation?

Accepted Answer

No, for simple cases, it offers zero-configuration. You just point the server to your OpenAPI spec, tag the endpoints you want to expose, and it works without any code generation or boilerplate.

Question 5

What authentication methods does it support for API calls?

Accepted Answer

It supports flexible authentication, including Bearer tokens and API keys (sent in headers or query parameters). Credentials are securely managed via environment variables.

OpenAPI Tool Builder

Key Features

Use Cases

OpenAPI Tool Builder

Key Features

Use Cases