How custom MCP actions work
This guide introduces Custom Actions, an advanced capability that allows your agent to go beyond answering questions and perform real-world tasks by connecting to external systems.
What are Custom Actions?
Custom Actions transform your agent from a passive Q&A tool into a proactive assistant capable of executing tasks. With a single URL to an MCP (Model Context Protocol) server, your agent can:
- Search the Internet.
- Book meetings.
- Check order or delivery status.
- Open support tickets.
- Trigger marketing campaigns.
- Access APIs.
This turns conversations into actions β saving time and enabling true end-to-end resolution.
Note:This is a premium feature.

Why are Custom Actions important?
Modern users expect more than answers β they expect solutions. By using Custom Actions, your agent can:
- Deliver instant outcomes like scheduling, approvals, or ticket creation.
- Provide additional value by connecting directly with your business systems.
- Reduce user effort by handling tasks inside the conversation.
This shifts your agent from an information layer to an execution layer, fully integrated into your workflows.
How Custom Actions work
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Add a Custom Action: You connect an MCP server to your agent in the Actions tab. This server defines the external tools that the agent can use. Learn how to add a custom action.
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Enable the Custom Action: After adding it, you must enable the action. Only one Custom Action can be active at a time, but you can store up to three custom actions. Learn how to enable a custom action.
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Agent detects available tools: The MCP server provides a set of tools (e.g., API calls, queries). Your agent automatically knows how to use them.
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Agent decides when to act: During a conversation, the agent determines if a user request requires one of these tools. For example, if a user asks βWhatβs my order status?β the agent may decide to invoke an ERP tool.
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Confirmation and execution: By default, the agent shows a summary before running a Custom Action. You can:
Require confirmation: The agent pauses and waits for you to click I understand.
Run automatically: The agent runs the action right away without asking.
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Action call and response: The MCP server executes the task and returns results. The agent integrates these results naturally into its reply.
What makes CustomGPT.ai different?
Other platforms provide a fixed catalog of integrations. CustomGPT.ai offers an open framework:
- You decide which MCP server to connect.
- You can integrate public or private systems.
- There are no limits on what your agent can do.
This flexibility makes Custom Actions future-proof and tailored to your exact workflows.
π Explore publicly available MCP servers: Awesome Remote MCP Servers
Custom Actions unlock new opportunities
Instead of acting like a passive Q&A machine, your agent can:
- Booking calls directly into your scheduling system.
- Opening support tickets in Jira, Zendesk, or ServiceNow.
- Checking delivery or order status in your ERP.
- Triggering marketing campaigns from your CRM.
- Fetch live data from external APIs or databases.
This allows your users to get things done instantly, without leaving the conversation.
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Updated about 7 hours ago