Windows 10 Pro x64 Cursor 0.47.8 Problem : A) let Agent create a file that is not existing yet in .cursor/rules/ by explicit folder reference. It proceeds with the output and the confirmation that it successfully wrote the file but it did not. When asked it replies : “Yes, it appears there might …

Update 0.49.x makes the fix above not required any more. We can easily update .mdc files.

.mdc files in .cursor/rules/ not or rarely writeable by Cursor Agent

Biggs (Biggs) March 28, 2025, 12:58pm 2

Topic		Replies	Views
Cursor agent cannot write to .cursor/rules (even to *.mdc files) Bug Reports	6	353	May 7, 2025
Cursor agent cannot write to .cursor/rules files Bug Reports	10	1410	April 20, 2025
Agent can't access .cursor/rules folder to modify them Bug Reports	2	182	April 22, 2025
When asking cursor to update it's rules files, it thinks it does, but it does not! Bug Reports	5	262	April 2, 2025
Cursor rules are not updated within agent mode Bug Reports	3	179	April 23, 2025