Calling Prompt Templates Directly in Flows

What this skill is for

A prompt template (GenAiPromptTemplate) can be called directly from a Flow as a standard action — you do not need an Apex class that calls ConnectApi.EinsteinLLM.generateMessagesForPromptTemplate. The Flow action type is generatePromptResponse, it takes the template's declared inputs, and it returns the model's answer as a String named promptResponse.

This skill captures the exact, verified wiring (ground-truthed from a working Active RoutingFlow) plus the one place Apex is still genuinely useful: converting the template's text output into a Text collection so a flow can loop over it. Flow has no built-in "split string into collection" operation, so a ~15-line invocable fills that single gap.

Worked example ships in assets/

Real, deployed-and-Active files this skill was extracted from (copy and adapt them):

• assets/example-routingflow-prompt-template-action.flow-meta.xml — the complete working RoutingFlow: Get_VoiceCall → generatePromptResponse (calls Lead_to_Skill_Matching) → apex transformer → loop → routeWork. Every element referenced below is in this file verbatim.
• assets/PromptResponseToSkillIds.cls — the text→collection transformer invocable.
• assets/PromptResponseToSkillIdsTest.cls — its passing test (3 methods: happy path, stray-text tolerance, blank/null).