"Right now, MCP ships with JSON-RPC over HTTP as its transport. That works well when dealing with natural-language payloads, but it creates a real headache for developers already running gRPC everywhere. Other options? Rewrite services to speak MCP's JSON transport, wire up transcoding proxies, or keep two separate implementations running side by side. None of those are great. Spotify's already felt this pain firsthand."
"Stefan Särne, senior staff engineer and tech lead for developer experience there, laid it out in Google's blog post: Because gRPC is our standard protocol in the backend, we have invested in experimental support for MCP over gRPC internally. And we already see the benefits: ease of use and familiarity for our developers, and reducing the work needed to build MCP servers by using the structure and statically typed APIs."
Google Cloud will contribute a gRPC transport package for the Model Context Protocol (MCP) to address integration challenges for organizations standardized on gRPC. MCP currently uses JSON-RPC over HTTP, which suits natural-language payloads but imposes JSON serialization overhead, inefficient long-polling for resource watches, and lacks type safety for gRPC-centric systems. Options such as rewriting services, adding transcoding proxies, or running dual implementations create operational friction. Early adopters like Spotify have built experimental MCP-over-gRPC support and reported easier developer experience and reduced server work by leveraging structured, statically typed APIs. MCP maintainers agreed to pluggable transports and Google will distribute the gRPC transport package.
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