Composer 2.0 not following rules

Support Bug Reports
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1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

Composer 2.0 has a hard time following rules when it’s a .md file, noticed that with .mdc files it works correctly.

Steps to Reproduce

have any rules with .md files, it doesnt follow or recognizes it. when you change it to .mdc, it works as usual.

Expected Behavior

composer 2.0 to find .md files in rules as well

Operating System

Windows 10/11

Version Information

Version: 2.7.0-pre.148.patch.0 (user setup)
VSCode Version: 1.105.1
Commit: 5ff7eda14604490cfa9ed615b378b85ed859bae0
Date: 2026-03-27T05:53:19.866Z
Layout: editor
Build Type: Stable
Release Track: Nightly
Electron: 39.8.1
Chromium: 142.0.7444.265
Node.js: 22.22.1
V8: 14.2.231.22-electron.0
OS: Windows_NT x64 10.0.26200

For AI issues: which model did you use?

composer 2.0

Does this stop you from using Cursor

No - Cursor works, but with this issue

5

Hey, thanks for the report. This is a known issue. The .cursor/rules/ directory currently only recognizes files with the .mdc extension, even though the docs mention .md support.

Workaround: rename your rule files from .md to .mdc. The content format is the same. Frontmatter with --- separators at the top, then the rule markdown content.

Related reports:

The team is aware of the mismatch. For now, .mdc is the reliable option.