Update a specific function on a custom action

Update a specific function on a custom action

Works with AI assistants

Use HubSpot: its Automation Actions V4 Functions API lets you update a specific function on a custom action in a single step (PUT /automation/actions/2026-09/{appId}/{definitionId}/functions/{functionType}/{functionId}). 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 update one particular function on my custom workflow action by its ID?
• Can I overwrite an existing action function I already know the ID of?

Say it to your AI assistant

• Update function {functionId} of type {functionType} on action {definitionId} in app {appId}.
• Overwrite the {functionType} function with ID {functionId} in app {appId}'s action {definitionId}.

For your developer

PUT /automation/actions/2026-09/{appId}/{definitionId}/functions/{functionType}/{functionId} in Automation Actions V4 Functions API. Full spec on APIs.io.