AI article
The A2A CLI and Rust: The Same Code, Three Ways to Serve It
Community description: A tour of the A2A CLI against Rust agents on A2A v1.0: the official Rust SDK, a plain stdin/stdout program wrapped by a2a server --exec, and an ADK coordinator on Gemini, each timed from the CLI and from a Rust client.
Dev.to | Nov 4, 2026 | xbill
Automated excerpt
The A2A CLI talks to all three with the same commands, and a2a server --exec turns a 30-line program with no A2A code into an agent that ADK can call. One a2a send from a shell takes a median 20.74 ms against the SDK agent, of which 7.62 ms is starting the CLI. From a Rust client the SDK agent adds 0.55 to 1.40 ms per call, the wrapped program 3.33 to 5.05 ms, and the ADK coordinator a median 1328 ms on gemini-3.5-flash and 2283 ms on gemini-3.8-flash.
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