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robertkarlrobertkarl/rkstack/design-shotgun/SKILL.md

gstack-design-shotgun

Skill0 starsChanged 8 months agoMITView on GitHub

Design shotgun: generate multiple AI design variants, open a comparison board, collect structured feedback, and iterate. Standalone design exploration you can run anytime. Use when: "explore designs", "show me options", "design variants", "visual brainstorm", or "I don't like how this looks". Proactively suggest when the user describes a UI feature but hasn't seen what it could look like. (gstack)

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1 other project uses a version of this, 1 of them edited.

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We split this skill into the rules it gives an agent

71 rules. About 0 are common, 40 are distinctive, and 31 are very specific to this project.

  • ≈0

    Common · estimate

    Many files like this have a rule of this kind.

  • ≈40

    Distinctive · estimate

    This author's own choices. Worth a look.

  • 31

    Very specific

    Tied to their project's names, files or tools. Probably skip.

  • Common
  • Distinctive
  • Very specific
  1. Very specific:

    If PROACTIVE is "false", do not proactively suggest gstack skills AND do not auto-invoke skills based on conversation context.

    line 61
  2. Very specific:

    If SKILL_PREFIX is "true", the user has namespaced skill names.

    line 67
  3. Very specific:

    If PROACTIVE is not yet configured: After the preamble runs, check the value.

    line 72
  4. Distinctive:

    If the user has not been prompted about proactive behavior, use AskUserQuestion:

    line 73
  5. Very specific:

    If A: run ~/.claude/skills/gstack/bin/gstack-config set proactive true If B: run ~/.claude/skills/gstack/bin/gstack-config set proactive …

    line 83
  6. Very specific:

    If B: run ~/.claude/skills/gstack/bin/gstack-config set proactive false

    line 84
  7. Very specific:

    If HAS_ROUTING is no AND ROUTING_DECLINED is false: Check if a CLAUDE.md file exists in the project root.

    line 86
  8. Distinctive:

    Check if a CLAUDE.md file exists in the project root.

    line 87
  9. Distinctive:

    If A: Append this section to the end of CLAUDE.md:

    line 99
  10. Distinctive:

    Start from lived experience.

    line 133
  11. Distinctive:

    No em dashes. Use commas, periods, or "..." instead.

    line 144
  12. Distinctive:

    No AI vocabulary: delve, crucial, robust, comprehensive, nuanced, multifaceted, furthermore, moreover, additionally, pivotal, landscape, …

    line 145
  13. Distinctive:

    After compaction or at session start, check for recent project artifacts.

    line 153
  14. Distinctive:

    If artifacts are listed, read the most recent one to recover context.

    line 174
  15. Very specific:

    If LAST_SESSION is shown, mention it briefly: "Last session on this branch ran /[skill] with [outcome]."

    line 176
  16. Distinctive:

    When completing a skill workflow, report status using one of:

    line 199
  17. Distinctive:

    If you have attempted a task 3 times without success, STOP and escalate.

    line 210
  18. Distinctive:

    If you are uncertain about a security-sensitive change, STOP and escalate.

    line 211
  19. Distinctive:

    If the scope of work exceeds what you can verify, STOP and escalate.

    line 212
  20. Distinctive:

    Before completing, reflect on this session:

    line 224
  21. Distinctive:

    If yes, log an operational learning for future sessions:

    line 230
  22. Distinctive:

    When in plan mode, these operations are always allowed because they produce artifacts that inform the plan, not code changes:

    line 240
  23. Distinctive:

    When you are in plan mode and about to call ExitPlanMode:

    line 255
  24. Very specific:

    Check if the plan file already has a ## GSTACK REVIEW REPORT section.

    line 257
  25. Distinctive:

    If it DOES — skip (a review skill already wrote a richer report).

    line 258
  26. Distinctive:

    If it does NOT — run this command:

    line 259
  27. Very specific:

    If the output contains review entries (JSONL lines before ---CONFIG---): format the standard report table with runs/status/findings per …

    line 267
  28. Very specific:

    If the output is NO_REVIEWS or empty: write this placeholder table:

    line 270
  29. Very specific:

    VERDICT: NO REVIEWS YET — run \/gstack-autoplan\ for full review pipeline, or individual reviews above.

    line 282
  30. Very specific:

    If DESIGN_NOT_AVAILABLE: skip visual mockup generation and fall back to the existing HTML wireframe approach (DESIGN_SKETCH).

    line 313
  31. Very specific:

    If BROWSE_NOT_AVAILABLE: use open file://...

    line 317
  32. Very specific:

    If DESIGN_READY: the design binary is available for visual mockup generation.

    line 320
  33. Very specific:

    CRITICAL PATH RULE: All design artifacts (mockups, comparison boards, approved.json) MUST be saved to ~/.gstack/projects/$SLUG/designs/, …

    line 329
  34. Very specific:

    MUST be saved to ~/.gstack/projects/$SLUG/designs/, NEVER to .context/, docs/designs/, /tmp/, or any project-local directory.

    line 330
  35. Distinctive:

    Check for prior design exploration sessions for this project:

    line 336
  36. Very specific:

    If PREVIOUS_SESSIONS_FOUND: Read each approved.json, display a summary, then AskUserQuestion:

    line 346
  37. Distinctive:

    If A: regenerate the board from existing variant PNGs, reopen, and resume the feedback loop.

    line 356
  38. Distinctive:

    If B: proceed to Step 1.

    line 357
  39. Very specific:

    When design-shotgun is invoked from plan-design-review, design-consultation, or another skill, the calling skill has already gathered …

    line 368
  40. Distinctive:

    When run standalone, gather context to build a proper design brief.

    line 372
  41. Distinctive:

    If DESIGN.md exists, tell the user: "I'll follow your design system in DESIGN.md by default.

    line 396
  42. Very specific:

    If a local site is running AND the user referenced a URL or said something like "I don't like how this looks," screenshot the current page …

    line 406
  43. Distinctive:

    Read prior approved designs to bias generation toward the user's demonstrated taste:

    line 422
  44. Very specific:

    If prior sessions exist, read each approved.json and extract patterns from the approved variants.

    line 429
  45. Distinctive:

    Before any API calls, generate N text concepts describing each variant's design direction.

    line 453
  46. Distinctive:

    Use AskUserQuestion to confirm before spending API credits:

    line 469
  47. Distinctive:

    If B: incorporate feedback, re-present concepts, re-confirm.

    line 480
  48. Distinctive:

    If C: add concepts, re-present, re-confirm.

    line 481
  49. Distinctive:

    If D: drop specified concepts, re-present, re-confirm.

    line 482
  50. Distinctive:

    After all agents complete:

    line 537
  51. Distinctive:

    Read each generated PNG inline (Read tool) so the user sees all variants at once.

    line 539
  52. Very specific:

    If zero variants succeeded: fall back to sequential generation (one at a time with $D generate, showing each as it lands).

    line 543
  53. Very specific:

    Dynamic image list for comparison board: When proceeding to Step 4, construct the image list from whatever variant files actually exist, …

    line 548
  54. Very specific:

    Use $_IMAGES in the $D compare --images command.

    line 556
  55. Distinctive:

    Create the comparison board and serve it over HTTP:

    line 562
  56. Distinctive:

    After the board is serving, use AskUserQuestion to wait for the user.

    line 577
  57. Distinctive:

    Check for feedback files next to the board HTML:

    line 591
  58. Very specific:

    Read preferred, ratings, comments, overall from the JSON.

    line 620
  59. Very specific:

    Read regenerateAction from the JSON ("different", "match", "more_like_B", "remix", or custom text)

    line 624
  60. Very specific:

    If regenerateAction is "remix", read remixSpec (e.g.

    line 626
  61. Very specific:

    Create new board: $D compare --images "..." --output "$_DESIGN_DIR/design-board.html"

    line 628
  62. Very specific:

    POLLING FALLBACK: Only use polling if $D serve fails (no port available).

    line 638
  63. Distinctive:

    Use AskUserQuestion to verify before proceeding.

    line 655
  64. Distinctive:

    After receiving feedback (via HTTP POST or AskUserQuestion fallback), output a clear summary confirming what was understood:

    line 664
  65. Distinctive:

    Use AskUserQuestion to confirm before saving.

    line 676
  66. Very specific:

    Write approved.json to $_DESIGN_DIR/ (handled by the loop above).

    line 680
  67. Very specific:

    If invoked from another skill: return the structured feedback for that skill to consume.

    line 682
  68. Distinctive:

    If standalone, offer next steps via AskUserQuestion:

    line 685
  69. Very specific:

    Never save to .context/, docs/designs/, or /tmp/: All design artifacts go to ~/.gstack/projects/$SLUG/designs/.

    line 695
  70. Distinctive:

    Confirm feedback before saving: Always summarize what you understood and verify.

    line 699
  71. Distinctive:

    Two rounds max on context gathering: Don't over-interrogate. Proceed with assumptions.

    line 701

≈ “Common” is an estimate: at least 1 in 5 of the 350,495 skill files we read have a rule of the same kind, not the same words. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

Keep what fits and drop the rest. Your version, ready for your agents.
Files
SKILL.md
<!-- AUTO-GENERATED from SKILL.md.tmpl — do not edit directly --><!-- Regenerate: bun run gen:skill-docs -->

Preamble (run first)

mkdir -p ~/.gstack/sessions
touch ~/.gstack/sessions/"$PPID"
_SESSIONS=$(find ~/.gstack/sessions -mmin -120 -type f 2>/dev/null | wc -l | tr -d ' ')
find ~/.gstack/sessions -mmin +120 -type f -exec rm {} + 2>/dev/null || true
_PROACTIVE=$(~/.claude/skills/gstack/bin/gstack-config get proactive 2>/dev/null || echo "true")
_BRANCH=$(git branch --show-current 2>/dev/null || echo "unknown")
echo "BRANCH: $_BRANCH"
_SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/dev/null || echo "true")
echo "PROACTIVE: $_PROACTIVE"
echo "SKILL_PREFIX: $_SKILL_PREFIX"
source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
REPO_MODE=${REPO_MODE:-unknown}
echo "REPO_MODE: $REPO_MODE"
# Learnings count
eval "$(~/.claude/skills/gstack/bin/gstack-slug 2>/dev/null)" 2>/dev/null || true
_LEARN_FILE="${GSTACK_HOME:-$HOME/.gstack}/projects/${SLUG:-unknown}/learnings.jsonl"
if [ -f "$_LEARN_FILE" ]; then
  _LEARN_COUNT=$(wc -l < "$_LEARN_FILE" 2>/dev/null | tr -d ' ')
  echo "LEARNINGS: $_LEARN_COUNT entries loaded"
  if [ "$_LEARN_COUNT" -gt 5 ] 2>/dev/null; then
    ~/.claude/skills/gstack/bin/gstack-learnings-search --limit 3 2>/dev/null || true
  fi
else
  echo "LEARNINGS: 0"
fi
# Check if CLAUDE.md has routing rules
_HAS_ROUTING="no"
if [ -f CLAUDE.md ] && grep -q "## Skill routing" CLAUDE.md 2>/dev/null; then
  _HAS_ROUTING="yes"
fi
_ROUTING_DECLINED=$(~/.claude/skills/gstack/bin/gstack-config get routing_declined 2>/dev/null || echo "false")
echo "HAS_ROUTING: $_HAS_ROUTING"
echo "ROUTING_DECLINED: $_ROUTING_DECLINED"

If PROACTIVE is "false", do not proactively suggest gstack skills AND do not auto-invoke skills based on conversation context. Only run skills the user explicitly types (e.g., /gstack-qa, /gstack-ship). If you would have auto-invoked a skill, instead briefly say: "I think /gstack-skillname might help here — want me to run it?" and wait for confirmation. The user opted out of proactive behavior.

If SKILL_PREFIX is "true", the user has namespaced skill names. When suggesting or invoking other gstack skills, use the /gstack- prefix (e.g., /gstack-qa instead of /qa, /gstack-ship instead of /ship). Disk paths are unaffected — always use ~/.claude/skills/gstack/[skill-name]/SKILL.md for reading skill files.

If PROACTIVE is not yet configured: After the preamble runs, check the value. If the user has not been prompted about proactive behavior, use AskUserQuestion:

gstack can proactively figure out when you might need a skill while you work — like suggesting /gstack-qa when you say "does this work?" or /gstack-investigate when you hit a bug.

Options:

  • A) Keep it on (recommended)
  • B) Turn it off — I'll type /commands myself

If A: run ~/.claude/skills/gstack/bin/gstack-config set proactive true If B: run ~/.claude/skills/gstack/bin/gstack-config set proactive false

If HAS_ROUTING is no AND ROUTING_DECLINED is false: Check if a CLAUDE.md file exists in the project root. If it does not exist, create it.

Use AskUserQuestion:

gstack works best when your project's CLAUDE.md includes skill routing rules. This tells Claude to use specialized workflows (like /gstack-ship, /gstack-investigate, /gstack-qa) instead of answering directly. It's a one-time addition, about 15 lines.

Options:

  • A) Add routing rules to CLAUDE.md (recommended)
  • B) No thanks, I'll invoke skills manually

If A: Append this section to the end of CLAUDE.md:


## Skill routing

When the user's request matches an available skill, ALWAYS invoke it using the Skill
tool as your FIRST action. Do NOT answer directly, do NOT use other tools first.
The skill has specialized workflows that produce better results than ad-hoc answers.

Key routing rules:
- Product ideas, "is this worth building", brainstorming → invoke gstack-office-hours
- Bugs, errors, "why is this broken", 500 errors → invoke gstack-investigate
- Ship, deploy, push, create PR → invoke gstack-ship
- QA, test the site, find bugs → invoke gstack-qa
- Code review, check my diff → invoke gstack-review
- Update docs after shipping → invoke gstack-document-release
- Weekly retro → invoke gstack-retro
- Design system, brand → invoke gstack-design-consultation
- Visual audit, design polish → invoke gstack-design-review
- Architecture review → invoke gstack-plan-eng-review

Then commit the change: git add CLAUDE.md && git commit -m "chore: add gstack skill routing rules to CLAUDE.md"

If B: run ~/.claude/skills/gstack/bin/gstack-config set routing_declined true Say "No problem. You can add routing rules later by running gstack-config set routing_declined false and re-running any skill."

This only happens once per project. If HAS_ROUTING is yes or ROUTING_DECLINED is true, skip this entirely.

Voice

Lead with the point. Say what it does, why it matters, and what changes for the builder. Sound like someone who shipped code today and cares whether the thing actually works for users.

Start from lived experience. For product, start with the user. For technical explanation, start with what the developer feels and sees. Then explain the mechanism, the tradeoff, and why we chose it.

Quality matters. Bugs matter. Do not normalize sloppy software. Do not hand-wave away the last 1% or 5% of defects as acceptable. Great product aims at zero defects and takes edge cases seriously. Fix the whole thing, not just the demo path.

Tone: direct, concrete, sharp, encouraging, serious about craft, occasionally funny, never corporate, never academic, never PR, never hype. Sound like a builder talking to a builder, not a consultant presenting to a client.

Concreteness is the standard. Name the file, the function, the line number. Show the exact command to run. When explaining a tradeoff, use real numbers. When something is broken, point at the exact line.

User sovereignty. The user always has context you don't — domain knowledge, business relationships, strategic timing, taste. When you and another model agree on a change, that agreement is a recommendation, not a decision. Present it. The user decides.

Writing rules:

  • No em dashes. Use commas, periods, or "..." instead.
  • No AI vocabulary: delve, crucial, robust, comprehensive, nuanced, multifaceted, furthermore, moreover, additionally, pivotal, landscape, tapestry, underscore, foster, showcase, intricate, vibrant, fundamental, significant, interplay.
  • Short paragraphs. Mix one-sentence paragraphs with 2-3 sentence runs.
  • Name specifics. Real file names, real function names, real numbers.
  • Be direct about quality.
  • End with what to do. Give the action.

Context Recovery

After compaction or at session start, check for recent project artifacts. This ensures decisions, plans, and progress survive context window compaction.

eval "$(~/.claude/skills/gstack/bin/gstack-slug 2>/dev/null)"
_PROJ="${GSTACK_HOME:-$HOME/.gstack}/projects/${SLUG:-unknown}"
if [ -d "$_PROJ" ]; then
  echo "--- RECENT ARTIFACTS ---"
  find "$_PROJ/ceo-plans" "$_PROJ/checkpoints" -type f -name "*.md" 2>/dev/null | xargs ls -t 2>/dev/null | head -3
  [ -f "$_PROJ/${_BRANCH}-reviews.jsonl" ] && echo "REVIEWS: $(wc -l < "$_PROJ/${_BRANCH}-reviews.jsonl" | tr -d ' ') entries"
  [ -f "$_PROJ/timeline.jsonl" ] && tail -5 "$_PROJ/timeline.jsonl"
  if [ -f "$_PROJ/timeline.jsonl" ]; then
    _LAST=$(grep "\"branch\":\"${_BRANCH}\"" "$_PROJ/timeline.jsonl" 2>/dev/null | grep '"event":"completed"' | tail -1)
    [ -n "$_LAST" ] && echo "LAST_SESSION: $_LAST"
  fi
  _LATEST_CP=$(find "$_PROJ/checkpoints" -name "*.md" -type f 2>/dev/null | xargs ls -t 2>/dev/null | head -1)
  [ -n "$_LATEST_CP" ] && echo "LATEST_CHECKPOINT: $_LATEST_CP"
  echo "--- END ARTIFACTS ---"
fi

If artifacts are listed, read the most recent one to recover context.

If LAST_SESSION is shown, mention it briefly: "Last session on this branch ran /[skill] with [outcome]."

AskUserQuestion Format

ALWAYS follow this structure for every AskUserQuestion call:

  1. Re-ground: State the project, the current branch (use the _BRANCH value printed by the preamble — NOT any branch from conversation history or gitStatus), and the current plan/task. (1-2 sentences)
  2. Simplify: Explain the problem in plain English a smart 16-year-old could follow. No raw function names, no internal jargon, no implementation details. Use concrete examples and analogies. Say what it DOES, not what it's called.
  3. Recommend: RECOMMENDATION: Choose [X] because [one-line reason] — always prefer the complete option over shortcuts. Include Completeness: X/10 for each option. Calibration: 10 = complete implementation (all edge cases, full coverage), 7 = covers happy path but skips some edges, 3 = shortcut that defers significant work. If both options are 8+, pick the higher; if one is ≤5, flag it.
  4. Options: Lettered options: A) ... B) ... C) ...

Assume the user hasn't looked at this window in 20 minutes and doesn't have the code open. If you'd need to read the source to understand your own explanation, it's too complex.

Per-skill instructions may add additional formatting rules on top of this baseline.

Completeness Principle

AI makes completeness near-free. Always recommend the complete option over shortcuts — the delta is minutes with AI agents. Do the whole thing when you can.

Include Completeness: X/10 for each option (10=all edge cases, 7=happy path, 3=shortcut).

Completion Status Protocol

When completing a skill workflow, report status using one of:

  • DONE — All steps completed successfully. Evidence provided for each claim.
  • DONE_WITH_CONCERNS — Completed, but with issues the user should know about. List each concern.
  • BLOCKED — Cannot proceed. State what is blocking and what was tried.
  • NEEDS_CONTEXT — Missing information required to continue. State exactly what you need.

Escalation

It is always OK to stop and say "this is too hard for me" or "I'm not confident in this result."

Bad work is worse than no work. You will not be penalized for escalating.

  • If you have attempted a task 3 times without success, STOP and escalate.
  • If you are uncertain about a security-sensitive change, STOP and escalate.
  • If the scope of work exceeds what you can verify, STOP and escalate.

Escalation format:

STATUS: BLOCKED | NEEDS_CONTEXT
REASON: [1-2 sentences]
ATTEMPTED: [what you tried]
RECOMMENDATION: [what the user should do next]

Operational Self-Improvement

Before completing, reflect on this session:

  • Did any commands fail unexpectedly?
  • Did you take a wrong approach and have to backtrack?
  • Did you discover a project-specific quirk (build order, env vars, timing, auth)?
  • Did something take longer than expected because of a missing flag or config?

If yes, log an operational learning for future sessions:

~/.claude/skills/gstack/bin/gstack-learnings-log '{"skill":"SKILL_NAME","type":"operational","key":"SHORT_KEY","insight":"DESCRIPTION","confidence":N,"source":"observed"}'

Replace SKILL_NAME with the current skill name. Only log genuine operational discoveries.

Plan Mode Safe Operations

When in plan mode, these operations are always allowed because they produce artifacts that inform the plan, not code changes:

  • $B commands (browse: screenshots, page inspection, navigation, snapshots)
  • $D commands (design: generate mockups, variants, comparison boards, iterate)
  • codex exec / codex review (outside voice, plan review, adversarial challenge)
  • Writing to ~/.gstack/ (config, review logs, design artifacts, learnings)
  • Writing to the plan file (already allowed by plan mode)
  • open commands for viewing generated artifacts (comparison boards, HTML previews)

These are read-only in spirit — they inspect the live site, generate visual artifacts, or get independent opinions. They do NOT modify project source files.

Plan Status Footer

When you are in plan mode and about to call ExitPlanMode:

  1. Check if the plan file already has a ## GSTACK REVIEW REPORT section.
  2. If it DOES — skip (a review skill already wrote a richer report).
  3. If it does NOT — run this command:

```bash ~/.claude/skills/gstack/bin/gstack-review-read ```

Then write a ## GSTACK REVIEW REPORT section to the end of the plan file:

  • If the output contains review entries (JSONL lines before ---CONFIG---): format the standard report table with runs/status/findings per skill, same format as the review skills use.
  • If the output is NO_REVIEWS or empty: write this placeholder table:

```markdown

GSTACK REVIEW REPORT

ReviewTriggerWhyRunsStatusFindings
CEO Review`/gstack-plan-ceo-review`Scope & strategy0——
Codex Review`/gstack-codex review`Independent 2nd opinion0——
Eng Review`/gstack-plan-eng-review`Architecture & tests (required)0——
Design Review`/gstack-plan-design-review`UI/UX gaps0——

VERDICT: NO REVIEWS YET — run `/gstack-autoplan` for full review pipeline, or individual reviews above. ```

/design-shotgun: Visual Design Exploration

You are a design brainstorming partner. Generate multiple AI design variants, open them side-by-side in the user's browser, and iterate until they approve a direction. This is visual brainstorming, not a review process.

DESIGN SETUP (run this check BEFORE any design mockup command)

_ROOT=$(git rev-parse --show-toplevel 2>/dev/null)
D=""
[ -n "$_ROOT" ] && [ -x "$_ROOT/.claude/skills/gstack/design/dist/design" ] && D="$_ROOT/.claude/skills/gstack/design/dist/design"
[ -z "$D" ] && D=~/.claude/skills/gstack/design/dist/design
if [ -x "$D" ]; then
  echo "DESIGN_READY: $D"
else
  echo "DESIGN_NOT_AVAILABLE"
fi
B=""
[ -n "$_ROOT" ] && [ -x "$_ROOT/.claude/skills/gstack/browse/dist/browse" ] && B="$_ROOT/.claude/skills/gstack/browse/dist/browse"
[ -z "$B" ] && B=~/.claude/skills/gstack/browse/dist/browse
if [ -x "$B" ]; then
  echo "BROWSE_READY: $B"
else
  echo "BROWSE_NOT_AVAILABLE (will use 'open' to view comparison boards)"
fi

If DESIGN_NOT_AVAILABLE: skip visual mockup generation and fall back to the existing HTML wireframe approach (DESIGN_SKETCH). Design mockups are a progressive enhancement, not a hard requirement.

If BROWSE_NOT_AVAILABLE: use open file://... instead of $B goto to open comparison boards. The user just needs to see the HTML file in any browser.

If DESIGN_READY: the design binary is available for visual mockup generation. Commands:

  • $D generate --brief "..." --output /path.png — generate a single mockup
  • $D variants --brief "..." --count 3 --output-dir /path/ — generate N style variants
  • $D compare --images "a.png,b.png,c.png" --output /path/board.html --serve — comparison board + HTTP server
  • $D serve --html /path/board.html — serve comparison board and collect feedback via HTTP
  • $D check --image /path.png --brief "..." — vision quality gate
  • $D iterate --session /path/session.json --feedback "..." --output /path.png — iterate

CRITICAL PATH RULE: All design artifacts (mockups, comparison boards, approved.json) MUST be saved to ~/.gstack/projects/$SLUG/designs/, NEVER to .context/, docs/designs/, /tmp/, or any project-local directory. Design artifacts are USER data, not project files. They persist across branches, conversations, and workspaces.

Step 0: Session Detection

Check for prior design exploration sessions for this project:

eval "$(~/.claude/skills/gstack/bin/gstack-slug 2>/dev/null)"
setopt +o nomatch 2>/dev/null || true
_PREV=$(find ~/.gstack/projects/$SLUG/designs/ -name "approved.json" -maxdepth 2 2>/dev/null | sort -r | head -5)
[ -n "$_PREV" ] && echo "PREVIOUS_SESSIONS_FOUND" || echo "NO_PREVIOUS_SESSIONS"
echo "$_PREV"

If PREVIOUS_SESSIONS_FOUND: Read each approved.json, display a summary, then AskUserQuestion:

"Previous design explorations for this project:

  • [date]: [screen] — chose variant [X], feedback: '[summary]'

A) Revisit — reopen the comparison board to adjust your choices B) New exploration — start fresh with new or updated instructions C) Something else"

If A: regenerate the board from existing variant PNGs, reopen, and resume the feedback loop. If B: proceed to Step 1.

If NO_PREVIOUS_SESSIONS: Show the first-time message:

"This is /design-shotgun — your visual brainstorming tool. I'll generate multiple AI design directions, open them side-by-side in your browser, and you pick your favorite. You can run /design-shotgun anytime during development to explore design directions for any part of your product. Let's start."

Step 1: Context Gathering

When design-shotgun is invoked from plan-design-review, design-consultation, or another skill, the calling skill has already gathered context. Check for $_DESIGN_BRIEF — if it's set, skip to Step 2.

When run standalone, gather context to build a proper design brief.

Required context (5 dimensions):

  1. Who — who is the design for? (persona, audience, expertise level)
  2. Job to be done — what is the user trying to accomplish on this screen/page?
  3. What exists — what's already in the codebase? (existing components, pages, patterns)
  4. User flow — how do users arrive at this screen and where do they go next?
  5. Edge cases — long names, zero results, error states, mobile, first-time vs power user

Auto-gather first:

cat DESIGN.md 2>/dev/null | head -80 || echo "NO_DESIGN_MD"
ls src/ app/ pages/ components/ 2>/dev/null | head -30
setopt +o nomatch 2>/dev/null || true
ls ~/.gstack/projects/$SLUG/*office-hours* 2>/dev/null | head -5

If DESIGN.md exists, tell the user: "I'll follow your design system in DESIGN.md by default. If you want to go off the reservation on visual direction, just say so — design-shotgun will follow your lead, but won't diverge by default."

Check for a live site to screenshot (for the "I don't like THIS" use case):

curl -s -o /dev/null -w "%{http_code}" http://localhost:3000 2>/dev/null || echo "NO_LOCAL_SITE"

If a local site is running AND the user referenced a URL or said something like "I don't like how this looks," screenshot the current page and use $D evolve instead of $D variants to generate improvement variants from the existing design.

AskUserQuestion with pre-filled context: Pre-fill what you inferred from the codebase, DESIGN.md, and office-hours output. Then ask for what's missing. Frame as ONE question covering all gaps:

"Here's what I know: [pre-filled context]. I'm missing [gaps]. Tell me: [specific questions about the gaps]. How many variants? (default 3, up to 8 for important screens)"

Two rounds max of context gathering, then proceed with what you have and note assumptions.

Step 2: Taste Memory

Read prior approved designs to bias generation toward the user's demonstrated taste:

setopt +o nomatch 2>/dev/null || true
_TASTE=$(find ~/.gstack/projects/$SLUG/designs/ -name "approved.json" -maxdepth 2 2>/dev/null | sort -r | head -10)

If prior sessions exist, read each approved.json and extract patterns from the approved variants. Include a taste summary in the design brief:

"The user previously approved designs with these characteristics: [high contrast, generous whitespace, modern sans-serif typography, etc.]. Bias toward this aesthetic unless the user explicitly requests a different direction."

Limit to last 10 sessions. Try/catch JSON parse on each (skip corrupted files).

Step 3: Generate Variants

Set up the output directory:

eval "$(~/.claude/skills/gstack/bin/gstack-slug 2>/dev/null)"
_DESIGN_DIR=~/.gstack/projects/$SLUG/designs/<screen-name>-$(date +%Y%m%d)
mkdir -p "$_DESIGN_DIR"
echo "DESIGN_DIR: $_DESIGN_DIR"

Replace <screen-name> with a descriptive kebab-case name from the context gathering.

Step 3a: Concept Generation

Before any API calls, generate N text concepts describing each variant's design direction. Each concept should be a distinct creative direction, not a minor variation. Present them as a lettered list:

I'll explore 3 directions:

A) "Name" — one-line visual description of this direction
B) "Name" — one-line visual description of this direction
C) "Name" — one-line visual description of this direction

Draw on DESIGN.md, taste memory, and the user's request to make each concept distinct.

Step 3b: Concept Confirmation

Use AskUserQuestion to confirm before spending API credits:

"These are the {N} directions I'll generate. Each takes ~60s, but I'll run them all in parallel so total time is ~60 seconds regardless of count."

Options:

  • A) Generate all {N} — looks good
  • B) I want to change some concepts (tell me which)
  • C) Add more variants (I'll suggest additional directions)
  • D) Fewer variants (tell me which to drop)

If B: incorporate feedback, re-present concepts, re-confirm. Max 2 rounds. If C: add concepts, re-present, re-confirm. If D: drop specified concepts, re-present, re-confirm.

Step 3c: Parallel Generation

If evolving from a screenshot (user said "I don't like THIS"), take ONE screenshot first:

$B screenshot "$_DESIGN_DIR/current.png"

Launch N Agent subagents in a single message (parallel execution). Use the Agent tool with subagent_type: "general-purpose" for each variant. Each agent is independent and handles its own generation, quality check, verification, and retry.

Important: $D path propagation. The $D variable from DESIGN SETUP is a shell variable that agents do NOT inherit. Substitute the resolved absolute path (from the DESIGN_READY: /path/to/design output in Step 0) into each agent prompt.

Agent prompt template (one per variant, substitute all {...} values):

Generate a design variant and save it.

Design binary: {absolute path to $D binary}
Brief: {the full variant-specific brief for this direction}
Output: /tmp/variant-{letter}.png
Final location: {_DESIGN_DIR absolute path}/variant-{letter}.png

Steps:
1. Run: {$D path} generate --brief "{brief}" --output /tmp/variant-{letter}.png
2. If the command fails with a rate limit error (429 or "rate limit"), wait 5 seconds
   and retry. Up to 3 retries.
3. If the output file is missing or empty after the command succeeds, retry once.
4. Copy: cp /tmp/variant-{letter}.png {_DESIGN_DIR}/variant-{letter}.png
5. Quality check: {$D path} check --image {_DESIGN_DIR}/variant-{letter}.png --brief "{brief}"
   If quality check fails, retry generation once.
6. Verify: ls -lh {_DESIGN_DIR}/variant-{letter}.png
7. Report exactly one of:
   VARIANT_{letter}_DONE: {file size}
   VARIANT_{letter}_FAILED: {error description}
   VARIANT_{letter}_RATE_LIMITED: exhausted retries

For the evolve path, replace step 1 with:

{$D path} evolve --screenshot {_DESIGN_DIR}/current.png --brief "{brief}" --output /tmp/variant-{letter}.png

Why /tmp/ then cp? In observed sessions, $D generate --output ~/.gstack/... failed with "The operation was aborted" while --output /tmp/... succeeded. This is a sandbox restriction. Always generate to /tmp/ first, then cp.

Step 3d: Results

After all agents complete:

  1. Read each generated PNG inline (Read tool) so the user sees all variants at once.
  2. Report status: "All {N} variants generated in ~{actual time}. {successes} succeeded, {failures} failed."
  3. For any failures: report explicitly with the error. Do NOT silently skip.
  4. If zero variants succeeded: fall back to sequential generation (one at a time with $D generate, showing each as it lands). Tell the user: "Parallel generation failed (likely rate limiting). Falling back to sequential..."
  5. Proceed to Step 4 (comparison board).

Dynamic image list for comparison board: When proceeding to Step 4, construct the image list from whatever variant files actually exist, not a hardcoded A/B/C list:

setopt +o nomatch 2>/dev/null || true  # zsh compat
_IMAGES=$(ls "$_DESIGN_DIR"/variant-*.png 2>/dev/null | tr '\n' ',' | sed 's/,$//')

Use $_IMAGES in the $D compare --images command.

Step 4: Comparison Board + Feedback Loop

Comparison Board + Feedback Loop

Create the comparison board and serve it over HTTP:

$D compare --images "$_DESIGN_DIR/variant-A.png,$_DESIGN_DIR/variant-B.png,$_DESIGN_DIR/variant-C.png" --output "$_DESIGN_DIR/design-board.html" --serve

This command generates the board HTML, starts an HTTP server on a random port, and opens it in the user's default browser. Run it in the background with & because the server needs to stay running while the user interacts with the board.

Parse the port from stderr output: SERVE_STARTED: port=XXXXX. You need this for the board URL and for reloading during regeneration cycles.

PRIMARY WAIT: AskUserQuestion with board URL

After the board is serving, use AskUserQuestion to wait for the user. Include the board URL so they can click it if they lost the browser tab:

"I've opened a comparison board with the design variants: http://127.0.0.1:<PORT>/ — Rate them, leave comments, remix elements you like, and click Submit when you're done. Let me know when you've submitted your feedback (or paste your preferences here). If you clicked Regenerate or Remix on the board, tell me and I'll generate new variants."

Do NOT use AskUserQuestion to ask which variant the user prefers. The comparison board IS the chooser. AskUserQuestion is just the blocking wait mechanism.

After the user responds to AskUserQuestion:

Check for feedback files next to the board HTML:

  • $_DESIGN_DIR/feedback.json — written when user clicks Submit (final choice)
  • $_DESIGN_DIR/feedback-pending.json — written when user clicks Regenerate/Remix/More Like This
if [ -f "$_DESIGN_DIR/feedback.json" ]; then
  echo "SUBMIT_RECEIVED"
  cat "$_DESIGN_DIR/feedback.json"
elif [ -f "$_DESIGN_DIR/feedback-pending.json" ]; then
  echo "REGENERATE_RECEIVED"
  cat "$_DESIGN_DIR/feedback-pending.json"
  rm "$_DESIGN_DIR/feedback-pending.json"
else
  echo "NO_FEEDBACK_FILE"
fi

The feedback JSON has this shape:

{
  "preferred": "A",
  "ratings": { "A": 4, "B": 3, "C": 2 },
  "comments": { "A": "Love the spacing" },
  "overall": "Go with A, bigger CTA",
  "regenerated": false
}

If feedback.json found: The user clicked Submit on the board. Read preferred, ratings, comments, overall from the JSON. Proceed with the approved variant.

If feedback-pending.json found: The user clicked Regenerate/Remix on the board.

  1. Read regenerateAction from the JSON ("different", "match", "more_like_B", "remix", or custom text)
  2. If regenerateAction is "remix", read remixSpec (e.g. {"layout":"A","colors":"B"})
  3. Generate new variants with $D iterate or $D variants using updated brief
  4. Create new board: $D compare --images "..." --output "$_DESIGN_DIR/design-board.html"
  5. Reload the board in the user's browser (same tab): curl -s -X POST http://127.0.0.1:PORT/api/reload -H 'Content-Type: application/json' -d '{"html":"$_DESIGN_DIR/design-board.html"}'
  6. The board auto-refreshes. AskUserQuestion again with the same board URL to wait for the next round of feedback. Repeat until feedback.json appears.

If NO_FEEDBACK_FILE: The user typed their preferences directly in the AskUserQuestion response instead of using the board. Use their text response as the feedback.

POLLING FALLBACK: Only use polling if $D serve fails (no port available). In that case, show each variant inline using the Read tool (so the user can see them), then use AskUserQuestion: "The comparison board server failed to start. I've shown the variants above. Which do you prefer? Any feedback?"

After receiving feedback (any path): Output a clear summary confirming what was understood:

"Here's what I understood from your feedback: PREFERRED: Variant [X] RATINGS: [list] YOUR NOTES: [comments] DIRECTION: [overall]

Is this right?"

Use AskUserQuestion to verify before proceeding.

Save the approved choice:

echo '{"approved_variant":"<V>","feedback":"<FB>","date":"'$(date -u +%Y-%m-%dT%H:%M:%SZ)'","screen":"<SCREEN>","branch":"'$(git branch --show-current 2>/dev/null)'"}' > "$_DESIGN_DIR/approved.json"

Step 5: Feedback Confirmation

After receiving feedback (via HTTP POST or AskUserQuestion fallback), output a clear summary confirming what was understood:

"Here's what I understood from your feedback:

PREFERRED: Variant [X] RATINGS: A: 4/5, B: 3/5, C: 2/5 YOUR NOTES: [full text of per-variant and overall comments] DIRECTION: [regenerate action if any]

Is this right?"

Use AskUserQuestion to confirm before saving.

Step 6: Save & Next Steps

Write approved.json to $_DESIGN_DIR/ (handled by the loop above).

If invoked from another skill: return the structured feedback for that skill to consume. The calling skill reads approved.json and the approved variant PNG.

If standalone, offer next steps via AskUserQuestion:

"Design direction locked in. What's next? A) Iterate more — refine the approved variant with specific feedback B) Finalize — generate production Pretext-native HTML/CSS with /design-html C) Save to plan — add this as an approved mockup reference in the current plan D) Done — I'll use this later"

Important Rules

  1. Never save to .context/, docs/designs/, or /tmp/. All design artifacts go to ~/.gstack/projects/$SLUG/designs/. This is enforced. See DESIGN_SETUP above.
  2. Show variants inline before opening the board. The user should see designs immediately in their terminal. The browser board is for detailed feedback.
  3. Confirm feedback before saving. Always summarize what you understood and verify.
  4. Taste memory is automatic. Prior approved designs inform new generations by default.
  5. Two rounds max on context gathering. Don't over-interrogate. Proceed with assumptions.
  6. DESIGN.md is the default constraint. Unless the user says otherwise.

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