Creates an implementation plan AND task breakdown from a feature spec by consuming design artifacts. Produces plan.md with implementation steps, inline task list with full REQ traceability, and a Requirement Mapping table. This is the single skill for planning + decomposition.
Install
npx skills add microsoft/github-copilot-modernization --skill creating-implementation-plannpx skills add microsoft/github-copilot-modernization --skill creating-implementation-plan -a claude-code -gnpx skills add microsoft/github-copilot-modernization --skill creating-implementation-plan -a codex -ggemini skills install https://github.com/microsoft/github-copilot-modernization.git --path plugins/github-copilot-modernization/skills/creating-implementation-plangh skill install microsoft/github-copilot-modernization creating-implementation-plangit clone --depth 1 https://github.com/microsoft/github-copilot-modernization /tmp/microsoft__github-copilot-modernization
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/microsoft__github-copilot-modernization/plugins/github-copilot-modernization/skills/creating-implementation-plan ~/.claude/skills/creating-implementation-plan # Claude Code
cp -R /tmp/microsoft__github-copilot-modernization/plugins/github-copilot-modernization/skills/creating-implementation-plan ~/.agents/skills/creating-implementation-plan # Codex, Cursor, Gemini CLI, Copilot, OpenCode