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Custom Tool Builder

Sometimes the built-in tools aren’t enough. You might need to call a proprietary internal API, process complex data, or chain multiple actions together. The Custom Tool Builder (also known as the AI Extender Tool) allows you to build a tool using a mini-workflow.

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The Concept

Instead of writing code, you define a tool using nodes.

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How to Build a Custom Tool

  1. Add the Node: Search for “Custom Tool Builder” (or AI Extender).
  2. Define Inputs: In the properties panel, define what the AI should send.
    • Example: order_id (String), reason (String).
    • The AI will intelligently extract these from the user’s message.
  3. Build the Chain:
    • Connect the Chain output handle to your first logic node (e.g., HTTP Request).
    • Perform your logic (e.g., Look up order status).
  4. Return the Result:
    • Connect the final node of your processing chain back to the Result input handle of the Custom Tool Builder.

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Accessing Inputs

Inside your chain, you can access the inputs the AI sent using variables:
  • {{ custom_tool_node_id.parameters.order_id }}
  • {{ custom_tool_node_id.parameters.reason }}

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Example: refund_processor

Imagine building a tool to process refunds.
  1. Tool Name: refund_order
  2. Description: “Process a refund for a customer order”
  3. Inputs: orderId, reason
  4. Logic Chain:
    • HTTP Request: POST to /api/refund with orderId.
    • Email Send: Email the user “Your refund is processed”.
  5. Result: Return {{ http_request.body.status }} to the AI.
The AI simply calls refund_order, and your workflow handles the complexity!