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When a Zapier MCP tool call fails, your MCP client may not display the error details. You can find the full failure details on your MCP server.

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Symptom

A tool call fails in your MCP client, but no error details are shown.

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Causes

Some MCP clients do not pass MCP error details through to the user interface. The error is still recorded on the server side, where you can check the request, the values used, and the failure reason.

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How to fix it

1

Open your server

Go to the Zapier MCP dashboard and select the server your MCP client is connected to. If several MCP clients are connected to the server, the history lists calls from all of them.
2

Go to the History tab

Select the clock icon History tab.
3

Inspect the failed call

Select the failed tool call to check the error details, including the values used and the output.

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Last modified on October 20, 2026