feat: cli pluggable transport - #24
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msardara
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Aug 31, 2026
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Looks good to me ✅
I am unsure about how we should handle the cpb version (protocolVersion in the agent card). We essentially have 2 ways:
- the plugin is able to handle all versions, so we also need to pass the version as well
- we can have one plugin per version, so the transport could be
--transport echo-v1,--transport echo-v2etc.
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The CLI speaks JSON-RPC, REST and gRPC out of the box. Additional transport bindings can be added without recompiling by dropping an
a2a-transport-<name>binary on yourPATH. The CLI launches the plugin as a local proxy that speaks a standard A2A binding and forwards to the custom protocol, so--transport <name>works uniformly for built-ins and plugins:Authoring a plugin in Go is a few lines with the
devkit/clitransportpackage — you provide ana2aclient.Transport, it produces a CLI-compatible plugin. See the transport plugin guide and the runnable echo plugin example.re #20