Diagnose and fix frontend↔backend contract failures by tracing requests, server logs, validation, auth, and responses on both sides. Use for API 4xx/5xx, mismatched payloads, or "frontend and backend disagree". One layer → debug-error.
Install
npx skills add kensaurus/skills --skill debug-fe-be-integrationnpx skills add kensaurus/skills --skill debug-fe-be-integration -a claude-code -gnpx skills add kensaurus/skills --skill debug-fe-be-integration -a codex -ggemini skills install https://github.com/kensaurus/skills.git --path skills/debug-fe-be-integrationgh skill install kensaurus/skills debug-fe-be-integrationgit clone --depth 1 https://github.com/kensaurus/skills /tmp/kensaurus__skills
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/kensaurus__skills/skills/debug-fe-be-integration ~/.claude/skills/debug-fe-be-integration # Claude Code
cp -R /tmp/kensaurus__skills/skills/debug-fe-be-integration ~/.agents/skills/debug-fe-be-integration # Codex, Cursor, Gemini CLI, Copilot, OpenCode