Agent Neutral Main File

The main instruction file must not contain agent-specific directives. Agent-specific syntax belongs in dedicated agent files, not the shared root.

Antipatterns

• Writing "Claude Code requires this format" in the main instruction file. The check detects agent names followed by directive words like "specific", "only", or "require".
• Adding "Copilot only supports single-file mode" to the shared root. Even factual statements trigger the check when they combine an agent name with a directive keyword.
• Using "Cursor-specific extensions" as a heading in the main file. Agent-specific content belongs in a dedicated agent file, not the shared root.

Pass / Fail

Pass

# Project Instructions

Use `ruff` for formatting.
Run `uv run pytest` before committing.
Keep modules under 500 lines.

Fail

# Project Instructions

Claude Code specific: always use the Read tool first.
Copilot only supports inline completions here.

Limitations

Detects agent-specific directives that name particular tools (Claude Code, Copilot, Cursor). Does not evaluate whether the content is functionally agent-neutral.