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@idosal idosal commented Dec 22, 2025

External libraries that want to adhere to the spec (through the official bridge SDK) have to use brittle JS tricks like event.data.method === McpUiSandboxProxyReadyNotificationSchema.shape.method._def.values[0]. Exporting the method names as constants makes it much easier to extend the spec without fragmentation.

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npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/ext-apps@192

commit: ff79336

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Pull request overview

This PR exports method name constants to provide a type-safe, stable API for checking MCP UI protocol message methods, replacing the need for brittle Zod schema introspection patterns.

  • Adds 14 method name constants (e.g., MCP_UI_OPEN_LINK_METHOD, MCP_UI_INITIALIZE_METHOD) for all MCP UI protocol messages
  • Exports all constants through the main types module for public API access

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File Description
src/spec.types.ts Defines 14 method name string constants with comprehensive JSDoc documentation explaining their purpose and usage
src/types.ts Re-exports all method name constants from spec.types.ts to make them available in the public API

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Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.


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Nice

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3 participants