Microsoft Copilot Agent Issue

Question

Hello,

We have had an agent through copilot studio for a few months now but the last few days whenever we ask it a question we get this response:

Error Message: The output returned from the connector was too large to be handled by the agent. Try reducing its size by utilizing available connector filters or by limiting the number of configured action outputs. Error Code: AsyncResponsePayloadTooLarge Conversation Id: 8ec4c394-6fc3-4372-b777-e7935bde2ea8 Time (UTC): 2025-12-15T22:38:43.384Z

How come this was working fine before but now its broken?

Answer 1

The error message you are encountering, "The output returned from the connector was too large to be handled by the agent," indicates that the payload being returned from one of your agent's connectors exceeds the size limit that the agent can process. This issue may have arisen due to changes in the data being returned by the connector or an increase in the amount of data being requested.

To resolve this issue, you can try the following:

1. Utilize Connector Filters: Apply filters to reduce the amount of data being returned by the connector.
2. Limit Action Outputs: Consider limiting the number of outputs configured in your actions to reduce the overall size of the response.

It's possible that the agent was previously able to handle the data size, but changes in the data or configuration have led to this new limitation being reached.

For more information regarding the payload limit, you can refer to the documentation on Copilot Studio web app limits.