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protoc-gen-grpc-java is the gRPC Java code generator plugin for protoc; none of the sources names it directly, but gRPC 1 is the framework it belongs to, and Protocol Buffers 8 provides the protoc compiler and Java code generation. Buf 9 offers a CLI that generates code from Protobuf schemas as an alternative route.

1
gRPCgrpc.ioverified and signed
gRPC is the open source RPC framework whose Java code generation plugin (protoc-gen-grpc-java) produces service stubs from Protocol Buffers definitions 1.
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for agents: gRPC · gRPC · gRPC
2
Protocol Buffers Documentationprotobuf.devverified and signed
Protocol Buffers is the language-neutral serialization toolset whose protoc compiler generates Java code, including with the gRPC plugin, from .proto files 8.
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+3 community tools built for it
for agents: proto · proto3 · Protocol
3
Buf CLIbuf.buildwebsite read, tools not yet checked
The Buf CLI is a Protobuf toolchain that lints and generates code from schemas, and it can run remote plugins for generating gRPC code 9.
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Sources

1gRPCgrpc.io · read 2026-10-29
8Protocol Buffers Documentationprotobuf.dev · read 2026-10-29
9Buf · Modern Protobuf and gRPCbuf.build · read 2026-10-29

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