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Pabbly MCP - OpenAI agent builder [500 errors from OpenAI Agent Builder when invoking Pabbly MCP custom API/webhook tools]

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Hello Pabbly!
I’ve been testing the new OpenAI Agent Builder with Pabbly MCP. The connection works well and I can see the MCP tools I created in Pabbly. Managing Google Sheets works fine, but when I run a custom API call or use MCP to send data to another webhook, I consistently get a 500 error.
What’s odd is the request does go through—the destination webhook receives the data—yet the OpenAI agent still returns a 500.
Here’s a screen recording: https://gyazo.com/03a0f19ee8d83bec304de0ccf83d78e2
Am i doing something wrong?
Thank you!
 
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