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505bc9baef
ag-ui-protocol 0.1.15 added a validator requiring TextMessageContentEvent.delta to have length >= 1. The test asserted that manually_emit_message with an empty string still emits the full TEXT_MESSAGE_START/CONTENT/END sequence — that behavior is no longer achievable at the protocol layer, and emitting empty content events was never semantically useful. Removing rather than guarding in code: the protocol should fail loudly on empty deltas, not silently drop them in CopilotKit. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>