Explore design directions through throwaway HTML mockups before committing to implementation. Each sketch produces 2-3 variants for comparison. Sketches live in `.planning/sketches/` and integrate with GSD commit patterns, state tracking, and handoff workflows. Loads spike findings to ground mockups in real data shapes and validated interaction patterns.

Two modes:

• Idea mode (default) — describe a design idea to sketch
• Frontier mode (no argument or "frontier") — analyzes existing sketch landscape and proposes consistency and frontier sketches

Does not require prior new-project setup — auto-creates .planning/sketches/ if needed.

<execution_context> @/.claude/gsd-core/workflows/sketch.md @/.claude/gsd-core/workflows/sketch-wrap-up.md @/.claude/gsd-core/references/ui-brand.md @/.claude/gsd-core/references/sketch-theme-system.md @/.claude/gsd-core/references/sketch-interactivity.md @/.claude/gsd-core/references/sketch-tooling.md @~/.claude/gsd-core/references/sketch-variant-patterns.md </execution_context>

<runtime_note> Copilot (VS Code): Use vscode_askquestions wherever this workflow calls AskUserQuestion. </runtime_note>

Design idea: $ARGUMENTS

Available flags:

• --quick — Skip mood/direction intake, jump straight to decomposition and building. Use when the design direction is already clear.
• --wrap-up — Package sketch design findings into a persistent project skill for future build conversations. Runs the sketch-wrap-up workflow.

Parse the first token of $ARGUMENTS: - If it is `--wrap-up`: strip the flag, execute the sketch-wrap-up workflow end-to-end. - Otherwise: execute the sketch workflow end-to-end.

Preserve all workflow gates (intake, decomposition, target stack research, variant evaluation, MANIFEST updates, commit patterns).