Before implementing new code (endpoints, components, services, models), search the codebase for existing patterns to reuse. Prevent code duplication by finding and suggesting similar implementations. Auto-trigger when user asks to create, implement, add, or build new functionality.
Install
npx skills add marcusgoll/Spec-Flow --skill anti-duplicationnpx skills add marcusgoll/Spec-Flow --skill anti-duplication -a claude-code -gnpx skills add marcusgoll/Spec-Flow --skill anti-duplication -a codex -ggemini skills install https://github.com/marcusgoll/Spec-Flow.git --path .claude/skills/anti-duplicationgh skill install marcusgoll/Spec-Flow anti-duplicationgit clone --depth 1 https://github.com/marcusgoll/Spec-Flow /tmp/marcusgoll__Spec-Flow
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/marcusgoll__Spec-Flow/.claude/skills/anti-duplication ~/.claude/skills/anti-duplication # Claude Code
cp -R /tmp/marcusgoll__Spec-Flow/.claude/skills/anti-duplication ~/.agents/skills/anti-duplication # Codex, Cursor, Gemini CLI, Copilot, OpenCode