The update-document tool is removing content

[protherj]

I'm having an issue when testing the MCP server on the test site with VS Code using GPT 4.1.

My API user only has access to the Content and Media (to keep the tool count down).

When I ask the Agent to set a property (like "Write a good SEO description for the About page in Umbraco"), it will do that. However, when I go to the page, I see the content Subtitle, Main Image, and Content Rows are now empty. Also, the Template is unassigned. The SEO description is set properly. I can roll back of course to get the old content back.

I see that the update-document tool is called, but it only passes in the new properties and not the old properties on the document as well.

When I add the text into my original prompt that you have in the tool instructions ("Always read the current document value first and only update the required values. Don't miss any properties from the original document that you are updating"), the Agent works great and it adds the content correctly and the other fields and template are preserved.

I will try Claude Desktop and Cursor and see if I get similar results. Have you experienced this? Is the Agent ignoring the Tool instructions somehow?

Thanks!

[Matthew-Wise]

Hi @protherj,
Not one I have seen. with this tool but we have seen with some other tools.
It is likely the agent is ignoring part of the instruction as you suspect, It usually indicates we need to update the description of the tool with CRITICAL: so it wont ignore the "suggestion"

Thanks for the report.

[protherj]

Happy to help. Thanks for looking into this!

-Jason