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Question

Box MCP Write Tools Appear in Schema but Return “Tool Not Found” at Runtime

  • August 28, 2026
  • 0 replies
  • 2 views

Hi everyone,

I’m testing the Box MCP Server with ChatGPT and have run into an issue specifically with write/update operations.

Read operations work normally. I can search folders, list folder contents, read file metadata, and retrieve file contents without any problem.

However, when I try to update an existing file, the MCP tool schema shows that tools such as upload_file_version and get_upload_url are available, but when ChatGPT actually invokes them, the runtime returns:

Tool upload_file_version not found

and

Tool get_upload_url not found

The affected file is a normal Markdown (.md) file in Box, and the authenticated user appears to have upload/edit permissions on the folder.

So the situation seems to be:

  • Box MCP connection/authentication works

  • Read tools work

  • The write/upload tools appear in the exposed tool list/schema

  • But those tools are not available at runtime

Has anyone encountered this behavior with the Box MCP Server?

Is there an additional Box MCP configuration, permission, feature flag, or server-side setting required to enable file-version uploads or overwrite/update operations?

I’d also be interested to know whether this is a known issue where a tool is advertised in the MCP schema but is not actually registered on the runtime side.

Thanks!