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fix: Reject messages to tasks in terminal states #760

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fix: Reject messages to tasks in terminal states #760

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7 changes: 7 additions & 0 deletions server-common/src/main/java/io/a2a/server/requesthandlers/DefaultRequestHandler.java
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Original file line number Diff line number Diff line change
Expand Up @@ -1034,6 +1034,13 @@ private MessageSendSetup initMessageSend(MessageSendParams params, ServerCallCon
task.id(), task.contextId(), messageContextId));
}

// Per spec CORE-SEND-002: Reject messages to tasks in terminal states
if (task.status().state().isFinal()) {
throw new UnsupportedOperationError(null, String.format(
"Cannot send message to task %s: task is in terminal state %s and cannot accept further messages",
task.id(), task.status().state()), null);
}

LOGGER.debug("Found task updating with message {}", params.message());
task = taskManager.updateWithMessage(params.message(), task);

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