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Hooks execute custom JavaScript code at specific cycles of your bot’s operation. For example: You can use Hooks to intercept and modify messages, perform logging, integrate with external systems, and more.

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Hooks vs. Actions / Execute Code

Hooks let you use custom code with your bot, just like Actions and Execute Code Cards. The key difference is when the code runs:
  • Actions and Execute Code Cards run at some point in your Workflow.
  • Hooks run during specific stages of the bot’s operation cycle

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Overview

When you add a new Hook, it defines a function that executes every time your bot reaches a certain cycle of its operation. All Hooks take an event parameter, which contains information about the event that triggered the Hook.
Some Hook types take additional parameters—check out the Hook guides on this page for more information.

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Add a Hook

  1. Navigate to the Hooks section in the Studio’s left navigation bar.
  2. Select Create Hook, then choose a type for the Hook.
  3. Choose a name for the Hook. Done!

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Hook types

Here’s a breakdown of each type of Hook:

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Before Incoming

This Hook type executes its code before your bot processes an incoming event. Parameters:
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IncomingEvent
Information about the last incoming event in your bot’s execution.

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After Incoming

This Hook type executes its code after the incoming message has been processed, but before the bot has responded. Parameters:
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IncomingEvent
Information about the last incoming event in your bot’s execution.

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Before Outgoing

This Hook type executes its code before the bot’s reply is sent to the user. Parameters:
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IncomingEvent
Information about the last incoming event in your bot’s execution.
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IO.OutgoingEvent
The message sent by the bot

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Before LLMz Execution

This Hook type executes its code before the LLMz engine begins its execution. Parameters:
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IncomingEvent
Information about the last incoming event in your bot’s execution.
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LLMZ.CreateContext
The current context provided to the LLMz

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After LLMz Execution

This Hook type executes its code after the LLMz engine finishes its execution. Parameters:
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IncomingEvent
Information about the last incoming event in your bot’s execution.
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LLMZ.ExecutionResult
The result of the execution

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After LLMz iteration

Depending on how demanding the task is, the LLMz may loop through multiple iterations before finishing its execution. This Hook type executes its code after each iteration. Parameters:
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IncomingEvent
Information about the last incoming event in your bot’s execution.
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LLMZ.IterationResult
The result of the iteration

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After Conversation End

This Hook type executes after the conversation has explicitly ended (transitioned to an End Node) Parameters:
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IncomingEvent
Information about the last incoming event in your bot’s execution.

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After Turn End

This Hook type executes after a full turn has completed—meaning the bot has received user input, processed it, and responded. You can use a Hook of this type to track AI spend and token cost for your bot. Parameters:
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IncomingEvent
Information about the last incoming event in your bot’s execution.
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IO.TurnMetadata
The turn’s metadata

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Troubleshooting

If your Hook isn’t behaving as expected, you can check your bot’s logs to diagnose any problems.
Last modified on June 12, 2026