Add validation to raise error when ChatMessageTrigger and entrypoint are both present#3448
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…are both present - Add ChatMessageTrigger to WorkflowTriggerType enum (CHAT_MESSAGE) - Add validation in serialize() to raise WorkflowValidationError when both ChatMessageTrigger and entrypoint nodes are present (mutually exclusive) - Add ChatMessageTrigger handling in _serialize_workflow_trigger() - Add tests for the validation Co-Authored-By: vincent@vellum.ai <0426vincent@gmail.com>
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vincent0426
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Dec 29, 2025
dvargas92495
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Adds validation to raise an error when serializing a workflow that has both a ChatMessageTrigger and an entrypoint node, since they are mutually exclusive.
Summary
CHAT_MESSAGEtoWorkflowTriggerTypeenumserialize()that raisesWorkflowValidationErrorwhen both ChatMessageTrigger and entrypoint nodes are present_serialize_workflow_trigger()to recognize it as a valid trigger typeReview & Testing Checklist for Human
has_chat_message_trigger and needs_entrypoint_node) correctly captures the mutual exclusivity requirement -needs_entrypoint_nodeis true when there's a ManualTrigger, no triggers at all, or non-trigger entrypoint nodes existNotes
The second test (
test_chat_message_trigger_without_entrypoint_does_not_raise_mutual_exclusivity_error) catches aValueErrorand passes - this is due to a pre-existing limitation whereChatMessageTrigger.messageattribute has a complex union type that can't be serialized byprimitive_type_to_vellum_variable_type. The test still validates that the mutual exclusivity error is not raised for valid ChatMessageTrigger-only workflows.