Add or replace a function by type on an action
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Add or replace a function by type on an action
with HubSpot
Works with AI assistants
Use HubSpot: its Automation Actions V4 Functions API lets you add or replace a function by type on an action in a single step (PUT /automation/actions/2026-09/{appId}/{definitionId}/functions/{functionType}). HubSpot also has an MCP server, so an AI assistant like Claude or ChatGPT can do it for you. capabilities.work can help you get signed up and connected.
- How do I attach a new serverless function of a given type to my custom workflow action?
- Does adding a function by type overwrite the one already registered for that type?
Say it to your AI assistant
- Insert a {functionType} function into action definition {definitionId} of app {appId}.
- Replace whatever {functionType} function workflow action {definitionId} in app {appId} currently uses.
For your developer
PUT /automation/actions/2026-09/{appId}/{definitionId}/functions/{functionType} in Automation Actions V4 Functions API. Full spec on APIs.io.