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Export Protocol and mergeCapabilities from client/server package roots (#2501)

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Felix Weinberger 2026-07-17 14:37:31 +01:00 • committed by GitHub
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---
'@modelcontextprotocol/core-internal': minor
'@modelcontextprotocol/client': minor
'@modelcontextprotocol/server': minor
'@modelcontextprotocol/codemod': patch
---
Export the `Protocol` base class and `mergeCapabilities` from the `@modelcontextprotocol/client` and `@modelcontextprotocol/server` package roots, restoring the v1 import for consumers that subclass `Protocol` (e.g. the MCP Apps SDK). The client and server packages each bundle their own compiled copy of the class, so import it from one package consistently within a process.
The codemod now rewrites `Protocol` and `mergeCapabilities` imports from `shared/protocol.js` to the client or server package root, like the module's other symbols, instead of dropping them with an action-required marker.