gstack/design-shotgun/SKILL.md.tmpl

---
name: design-shotgun
preamble-tier: 2
version: 1.0.0
description: |
  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)
triggers:
  - explore design variants
  - show me design options
  - visual design brainstorm
allowed-tools:
  - Bash
  - Read
  - Glob
  - Grep
  - Agent
  - AskUserQuestion
gbrain:
  schema: 1
  context_queries:
    - id: prior-approved-variants
      kind: filesystem
      glob: "{gstack_state_root}/projects/{repo_slug}/designs/*/approved.json"
      sort: mtime_desc
      limit: 5
      render_as: "## Prior approved design variants for this project"
    - id: design-md
      kind: filesystem
      glob: "DESIGN.md"
      tail: 1
      render_as: "## DESIGN.md (project design system)"
    - id: recent-design-docs
      kind: filesystem
      glob: "~/.gstack/projects/{repo_slug}/*-design-*.md"
      sort: mtime_desc
      limit: 3
      render_as: "## Recent design docs"
---

{{PREAMBLE}}

# /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.

---

{{SECTION_INDEX:design-shotgun}}

---

{{DESIGN_SETUP}}

{{SECTION:doctrine}}

## Step 0: Session Detection

Check for prior design exploration sessions for this project:

```bash
eval "$(~/.claude/skills/gstack/bin/gstack-slug 2>/dev/null)"
eval "$(~/.claude/skills/gstack/bin/gstack-paths)"; : "${GSTACK_STATE_ROOT:?gstack-paths failed; reinstall with ./setup or /gstack-upgrade}"
setopt +o nomatch 2>/dev/null || true
_PREV=$(find "$GSTACK_STATE_ROOT/projects/$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:**

```bash
cat DESIGN.md 2>/dev/null | head -80 || echo "NO_DESIGN_MD"
cat PRODUCT.md 2>/dev/null | head -120 || echo "NO_PRODUCT_MD"
```

A `PRODUCT.md` (impeccable's product-context file) answers the job-to-be-done and audience questions: confirm, do not re-ask. Never open `.claude/skills/impeccable/**`.

```bash
ls src/ app/ pages/ components/ 2>/dev/null | head -30
```

```bash
eval "$(~/.claude/skills/gstack/bin/gstack-paths)"; : "${GSTACK_STATE_ROOT:?gstack-paths failed; reinstall with ./setup or /gstack-upgrade}"
setopt +o nomatch 2>/dev/null || true
ls "$GSTACK_STATE_ROOT"/projects/$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):

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

If the user referenced a URL or said something like "I don't like how this looks,"
screenshot that page with Aside in Step 3c and use `$D evolve` instead of `$D variants`
to generate improvement variants from the existing design. If they didn't name the URL,
ask for it — never guess which page they mean. If the probe above printed `200`, offer
`http://localhost:3000` as the default in the AskUserQuestion below (still ask — never assume).

**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 both the persistent taste profile (cross-session) AND the per-session approved
designs to bias generation toward the user's demonstrated taste.

**Persistent taste profile (v1 schema at `~/.gstack/projects/$SLUG/taste-profile.json`):**

{{TASTE_PROFILE}}

**Per-session approved.json files (legacy, still supported):**

```bash
eval "$(~/.claude/skills/gstack/bin/gstack-slug 2>/dev/null)"
eval "$(~/.claude/skills/gstack/bin/gstack-paths)"; : "${GSTACK_STATE_ROOT:?gstack-paths failed; reinstall with ./setup or /gstack-upgrade}"
setopt +o nomatch 2>/dev/null || true
_TASTE=$(find "$GSTACK_STATE_ROOT/projects/$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. Merge these into the taste-profile.json-derived signal — if the
profile already says "user prefers Geist font" (from aggregated history), the
approved.json files add the specific recent approval context.

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

**Updating taste profile after a design-shotgun session:** When the user picks a
variant, call `{{BIN_DIR}}/gstack-taste-update approved <variant-path>`. When they
explicitly reject a variant, call `{{BIN_DIR}}/gstack-taste-update rejected <variant-path>`.
The CLI handles schema migration from approved.json, decay, and conflict flagging.

## Step 3: Generate Variants

Set up the output directory:

```bash
eval "$(~/.claude/skills/gstack/bin/gstack-slug 2>/dev/null)"
eval "$(~/.claude/skills/gstack/bin/gstack-paths)"; : "${GSTACK_STATE_ROOT:?gstack-paths failed; reinstall with ./setup or /gstack-upgrade}"
_DESIGN_DIR="$GSTACK_STATE_ROOT/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.

**Anti-convergence directive (hard requirement):** Each variant MUST use a different
font family, color palette, and layout approach. If two variants look like siblings
— same typographic feel, overlapping color temperature, comparable layout rhythm —
one of them failed. Regenerate the weaker one with a deliberately different direction.

Concrete test: if someone could swap the headline text between two variants without
noticing, they're too similar. Variants should feel like they came from three
different design teams, not the same team at three different coffee levels.

### 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
of the page the user named, in Aside (PNG — `$D evolve` reads PNG):

```bash
aside repl '
const pg = await openTab("<url>");
await pg.screenshot({ path: "current.png", type: "png", fullPage: true });
console.log("ASIDE_DIR=" + pwd);
await closeTab(pg);
console.log("GSTACK_STEP_OK");
'
```

Then `cp "<ASIDE_DIR>/current.png" "$_DESIGN_DIR/current.png"` and Read it so the user
sees what you're evolving from.

**Launch N Agent subagents in a single message** (parallel execution). Use the Agent
tool with `subagent_type: "general-purpose"` and `run_in_background: false` for each
variant (parallel foreground calls in one message still run concurrently; subagents
default to background since Claude Code v2.1.198, and the comparison board needs every
variant's result). 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:

```bash
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

{{DESIGN_SHOTGUN_LOOP}}

## 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. **Use the configured state root.** All design artifacts go to
   `$GSTACK_STATE_ROOT/projects/$SLUG/designs/`, even when that root is temporary.
   Do not substitute `.context/`, `docs/designs/`, or an arbitrary `/tmp/` path. 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.