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connect-rust is a Tower-based Rust implementation of the ConnectRPC protocol. Generates service traits, typed clients, and monomorphic dispatchers. Compatible with Connect, gRPC, and gRPC-Web; passes the full ConnectRPC conformance suite (3600 server tests, 6872 client tests across protocols). The plugin emits service stubs only. Message types come from the buffa plugin (declared as a dep here). Generated stubs reference message types via absolute paths; the plugin accepts `extern_path=.=<path>` to configure the root. Left `opts: []` with a comment asking how BSR injects the dep crate path - same mechanism as tonic/prost presumably, but want to confirm the exact value. Note: the protoc-gen-connect-rust binary is a [[bin]] target in the connectrpc-codegen crate, so the Dockerfile installs connectrpc-codegen by name and copies the binary out. Depends on buf.build/community/anthropics-buffa:v0.2.0 (separate PR). Crates: https://crates.io/crates/connectrpc-codegen Repo: https://github.com/anthropics/connect-rust
This was referenced Mar 17, 2026
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Adds the
protoc-gen-connect-rustplugin for ConnectRPC Rust service bindings.About connect-rust
connect-rust is a Tower-based Rust implementation of the ConnectRPC protocol:
request.nameis a&strborrow into the decoded bufferCrates on crates.io:
connectrpc,connectrpc-codegen,connectrpc-build.Plugin layering
The plugin emits service stubs only - server traits, typed clients, monomorphic dispatchers. Message types come from
buf.build/community/anthropics-buffa(declared indeps:). Generated stubs reference message types via absolute Rust paths (crate::<buffa_sdk>::pkg::Type).Dockerfile note: the
protoc-gen-connect-rustbinary is a[[bin]]target inside theconnectrpc-codegencrate, socargo install connectrpc-codegenis what produces it.Open question: extern_path injection
The plugin needs to know where the buffa SDK crate lives to emit the right paths. It accepts either
extern_path=.=<rust_path>(same format as tonic/prost) or the shorthandbuffa_module=<rust_path>.I left
opts: []with a comment in the yaml because I assume BSR injectsextern_path=.=::<buffa_sdk_crate_name>at invocation time based on thedeps:config - same as it does for tonic referencing prost types. Would appreciate confirmation of the exact value BSR injects so I can verify the plugin handles it correctly.Dependencies
Depends on the buffa plugin landing first: #2333
Process note
CONTRIBUTING.md asks for an issue first - happy to open one if you would prefer to discuss before reviewing. Filed as draft.