Cursor agent refuses to include Slack thread link in PR description (ManagePullRequest tool)

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Where does the bug appear (feature/product)?

Background Agent (GitHub, Slack, Web, Linear)

Describe the Bug

Using a Cursor cloud agent, the agent is unable to update the PR description with a Slack Thread. Looks like the internal ManagePullRequest tool is blocking it specifically.

I see a recent issue that was closed with similar issue for linear: Cursor Agent is unable to include a Linear URL in a Github PR

Attaching a screenshot showing the output I am getting.

Steps to Reproduce

Ask Cursor to include a slack thread in a PR description

Screenshots / Screen Recordings

cursor-slack-thread-refusal.png
cursor-slack-thread-refusal.png1722×1594 368 KB

Operating System

MacOS

Version Information

Using cloud agent from Cursor.com, so latest

Does this stop you from using Cursor

No - Cursor works, but with this issue

7

Hi Dylan!

This is a confirmed bug. The cloud agent’s PR management validation is incorrectly treating any Slack archive URL in the PR body as system-managed metadata, blocking the update entirely. The same issue also affects Linear URLs in PR descriptions (e.g., from PR templates).

There’s no workaround at the moment since the validation runs server-side. Our team is aware of this and is working on a fix to properly distinguish between user-supplied URLs and the system-managed ones. Thanks for flagging it.