Claude Desktop Error 'result exceeds maximum length of 1048576'

This can happen your tool responds with a message larger than 1048576 bytes, or about 1.04 MB. It's unclear why Claude has this seemlingly arbitrary limit, but it can be a problem if you are trying to get a large response from Claude.

Strategies

Reduce the size of whatever your tool responds with - typically with most string returning tools this won't be a problem, but if you are returning image data, you may need to reduce the size of the image. If you still want a way to retrieve the full image, perhaps consider returning the file path to the image instead of the image data itself.