Evaluate and carry out non-trivial software-system changes from first principles. Use when assessing RFCs, issues, designs, features, refactors, migrations, dependency changes, or proposed fields, events, APIs, modules, and services whose need, consumers, system fit, validation, or rollback require scrutiny.
Install
npx skills add bytedance/deer-flow --skill engineer-system-changenpx skills add bytedance/deer-flow --skill engineer-system-change -a claude-code -gnpx skills add bytedance/deer-flow --skill engineer-system-change -a codex -ggemini skills install https://github.com/bytedance/deer-flow.git --path .agent/skills/engineer-system-changegh skill install bytedance/deer-flow engineer-system-changegit clone --depth 1 https://github.com/bytedance/deer-flow /tmp/bytedance__deer-flow
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/bytedance__deer-flow/.agent/skills/engineer-system-change ~/.claude/skills/engineer-system-change # Claude Code
cp -R /tmp/bytedance__deer-flow/.agent/skills/engineer-system-change ~/.agents/skills/engineer-system-change # Codex, Cursor, Gemini CLI, Copilot, OpenCode