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Copilot Studio
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Why a Tool can not accept a Global Variable

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Posted on by DC-05021006-0
Hi, guys,

I am traying to put as an INPUT to a Tool a GLOBAL variable of a Question node from a Topic. The Tool is not able to find it. I use "Run a prompt" where I try to access via Formula. But I always get "not existing Object" Error.
The Tool is published. Both are in the same environment.
Unfortunately I couldn't find any solution in the documentation.

Thanks for any ideas! :)
Categories:
Calling actions from Copilot Studio
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  • Suggested answer
    Nivedipa-MSFT Profile Picture
    Nivedipa-MSFT Microsoft Employee on at
    Hello DC-05021006-0,

    This error usually means the variable’s scope or reference is incorrect. In Copilot Studio:

    • Question node variables are local to the Topic unless explicitly set as global.
    • To use a variable as Tool input, ensure you:
      1. Mark the variable as global (use “Set a variable” action and set it as global).
      2. Reference the global variable in your formula as $global.variableName (not just variableName).
      3. Double-check spelling and case sensitivity.

    If you still get “not existing Object,” the variable may not be set or is out of scope at the time the Tool runs. Try outputting the variable’s value in a message before the Tool call to confirm it exists.

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