Create a custom workflow action
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Create a custom workflow action
with HubSpot
Works with AI assistants
Use HubSpot: its Hubspot Definitions API lets you create a custom workflow action in a single step (POST /automation/actions/2026-09/{appId}). 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 add my own action to HubSpot workflows from my app?
- What inputs does a new custom workflow action need, like its execution URL?
Say it to your AI assistant
- Create a custom workflow action for app {appId} that calls {actionUrl}.
- Define a new action on app {appId} with input fields {inputFields} for object types {objectTypes}.
For your developer
POST /automation/actions/2026-09/{appId} in Hubspot Definitions API. Full spec on APIs.io.