AgentRadio Lets Coding Agents Message Each Other Mid-Task, Lifting SWE-Atlas QnA From 32.3% to 62.1%

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AgentRadio (arXiv 2607.28430, July 30) adds an asynchronous message-passing layer to coding-agent harnesses with three primitives — threads, messages, and waiting for mentions — where the wait runs as a background task so an agent stays passively aware of teammates without interrupting foreground work. On SWE-Atlas QnA, a benchmark of long-horizon codebase questions over production repositories, a single Claude Code agent on Opus 4.6 resolves 32.3% of tasks; four agents coordinated by AgentRadio under a five-phase division-of-labor protocol reach 62.1%, which also beats Claude Code on the newer Opus 4.8 at 57.2%. The gain widens with task difficulty, consistent with mid-course correction rather than raw parallelism, and the code is released under Coral-Protocol.