Mantle

Mantle is an open-source service runtime and WebMCP-native Builder that turns business rules into typed schemas, views, procedures, and HTTP/MCP triggers. Design and verify a service in the browser, then hand it to a coding agent to materialize, verify, and deploy to your own Cloudflare account. The OSS, Builder, and first-class Cloudflare deployment path are live now. Mantle Cloud remains in Internal Beta with a waitlist.