All rules

R003 ContradictoryModals

Applies to
Rules files (CLAUDE.md, AGENTS.md, .mdc, .cursorrules, Copilot instructions, GEMINI.md, .windsurfrules)
Severity
Error (−10 per finding, max −30)
Summary
Mirrored instructions: the same instruction is both required and forbidden.
Flags
A line starting with always / must and another starting with never / must not / do not, with the same remaining text.
Measured false-positive rate
Not measured: no findings in the 755-file corpus. Methodology

Before

- Always use tabs.
- Never use tabs.

After

- Use tabs.

Fix