OpenAPI tools without giving up your API.

Overview

Mulder turns selected OpenAPI 3.1 operations into WebMCP tools. It generates descriptors and request construction; in server-backed mode your application continues to own identity, policy, approval, execution, and result filtering.

What Mulder does

• Generates deterministic tool names and input schemas.
• Rejects enabled operations it cannot preserve safely.
• Publishes same-origin discovery and call routes in the complete companion.
• Separates direct reads from approval-managed writes.

What stays in your app

• Authentication and authorization.
• Write approval and idempotency.
• API credentials and cookies.
• Business logic and response filtering.

Where it fits

Browser agent
  -> Mulder tool route
  -> validated input
  -> your policy and API