Zapier MCP suddenly disconnected — can’t reconnect or re-authenticate

Oct '25 • General

Has anyone else run into problems where the Zapier MCP server connection just stops working and refuses to reconnect?

Everything was running perfectly in my workflow until the authentication token expired. Normally I’d just reconnect, but this time it completely broke. When I try to reconnect or rebuild the MCP:

The connection test fails immediately — sometimes with a CEL parse error if I rotate or re-enter the API key.
Other times I get a 401 authorization error, even after deleting and recreating both the MCP server in Agent Builder and the integration in Zapier.
The connection used to work fine — same workspace, same setup.

At this point I’m wondering whether:

Zapier changed something on the MCP side,
the OpenAI Agent Builder client/runtime changed how it handles Zapier MCP auth. I did notice that Zapier now has two clients, OpenAI Agent Builder and OpenAI API. Im using the OpenAI Agent Builder client which I assume is correct.
there’s some hidden credential cache I need to clear.

Has anyone else seen this or found a reliable way to get the Zapier MCP to reconnect after a token expires?

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