claude/lib/design-gate.md

DESIGN GATE — Auto-detect design tasks, ensure the design toolchain is active

Inline snippet. Include in any agent STEP 0 that may touch UI/design.

WHEN TO RUN

Run this gate when the task description OR target files match design signals.

DETECTION

Check BOTH the task description AND the filesystem:

Task description signals (case-insensitive match on $ARGUMENTS):

• UI keywords: component, button, card, modal, dialog, tooltip, dropdown, sidebar, navbar, header, footer, layout, grid, form, input, table
• Style keywords: css, style, theme, color, font, spacing, margin, padding, border, shadow, animation, transition, hover, motion, animate, responsive, dark mode, light mode
• Design keywords: design, ui, ux, visual, polish, pixel, figma, mockup, wireframe, prototype
• Framework UI: tailwind, styled-component, emotion, chakra, radix, shadcn, headless

Filesystem signals (quick check, no deep scan):

• Target files have .tsx, .jsx, .css, .scss, .less, or .module.css extension
• tailwind.config or postcss.config present in project root
• tokens/, theme/, or design-system/ directory exists
• Storybook config (.storybook/) present
• Animation lib in package.json deps: motion, motion-v, framer-motion (legacy), gsap, @gsap/react, lottie-react, react-spring, popmotion, @formkit/auto-animate

DECISION

Source of truth for activation is the profile system — never an atomic per-tool toggle. The gate's whole job: confirm the design toolchain is active, and if not, point at ONE command — /profile design.

1. Tier — does the gate even apply?

• Trivial (≤2 files, single cosmetic value, one CSS tweak — same scope as /hotfix) → no design tools required. Skip the gate, proceed.
• Build UI / design system / review-audit → toolchain required, continue.
• In doubt (trivial tweak vs real UI change) → do NOT silently skip: ask the user, or default to the Build tier.

Tier does NOT change WHAT gets checked. Every non-trivial design tier draws from the one design profile — so the gate checks that profile's design-core tools (the # GATE-BLOCK: allowlist in design.profile: ui-ux-pro-max, frontend-design, emil-design-eng, design-motion-principles, impeccable, design-html, design-review, design-consultation, the 21st CLI and 21st-ui-build — the canary for the whole 21st skill pack). The profile also bundles browser/plan/shotgun tooling and graphify for convenience; those never trip the gate. Motion (design-motion-principles) and static-HTML (design-html) are already in the core set — checked regardless; their CLAUDE.md "+motion / +static" notes say which tool you'll lean on, not a separate activation step.

2. State — run the deterministic check

bash "$HOME/.claude/lib/design-tool-gate.sh"

It reads the design-core tools (# GATE-BLOCK: in design.profile) plus their types (profile.sh show design --plain) and checks each on its own channel — skill symlink, claude plugin list, claude mcp list, command -v. It never reads disabledMcpServers (unreliable for bi-modal servers like context7). The core set lives in design.profile, not in the script or here — single source.

Exit codes: 0 = ready · 11 = ready-but-unverified (proceed, but surface it) · 10 = incomplete (gate trips) · 2 = error.

3. Branch on the result

• 0 / READY → proceed silently. Toolchain is active.

• 10 / INCOMPLETE → STOP. The script reports up to three groups; relay them and the remedy to the user:

  🎨 DESIGN DETECTED — the design toolchain isn't fully active.
  activate with /profile design:        <skills / ui-ux-pro-max>
  required + manual step:                <e.g. 21st — needs the CLI>
  → run  /profile design  to activate it, then continue.
  

  • activate with /profile design → skills + the plugin; /profile design turns them on directly.
  • required + manual step → required tools the profile can't flip silently. the 21st CLI lands here: it TRIPS the gate (it's required for Build), it is NOT a silent "optional". /profile design symlinks the 21st skills, but the CLI they shell out to is a global npm install: tell the user to run npm i -g @21st-dev/cli then 21st login (no API key, no MCP).
  • Do NOT hand-activate individual tools. The profile is the unit of activation.

• 11 / READY BUT UNVERIFIED → claude was unreachable, so the design plugin (ui-ux-pro-max) could NOT be checked. Do NOT report a plain "ready": proceed only after telling the user that N tool(s) went unverified and having them confirm with claude plugin list. Fail-visible, not fail-silent.

4. Animation library — suggest-only (fires only on a real motion signal)

Orthogonal to the toolchain check above: §2-3 are about Claude's design TOOLS; this is about the PROJECT's runtime dep. Evaluate it only once the toolchain is resolved and you're actually proceeding with the build (READY, or after the user ran /profile design). Never on the INCOMPLETE stop path — that path has one action only (/profile design); don't stack an optional note on it.

Fires only when ALL THREE hold — drop any one → no suggestion, stay silent:

1. Motion signal — the task matched a motion keyword from §DETECTION: animation, transition, hover, motion, or animate. A static button / card / layout with no motion signal needs no anim lib → skip.
2. Stack eligible — detect_anim_eligibility returns eligible|….
3. No anim lib yet — is_anim_lib_installed finds none.

Only if condition 1 holds, run the helper for 2 and 3 — do NOT re-list packages here; the helper's is_anim_lib_installed is the single source of which libs count:

source "$HOME/.claude/lib/animation-lib-check.sh"
result=$(detect_anim_eligibility)            # '<status>|<package>|<reason>'
status=$(echo "$result" | cut -d'|' -f1)
pkg=$(echo "$result"    | cut -d'|' -f2)
reason=$(echo "$result" | cut -d'|' -f3)
if [ "$status" = "eligible" ] && ! is_anim_lib_installed >/dev/null; then
  cmd=$(recommend_anim_install_cmd "$pkg")   # pnpm/yarn/bun/npm per lockfile
  # → surface the one-line suggestion below. Do NOT run $cmd.
fi

Surface — always this single line (non-blocking, suggest-only):

🎬 Stack motion-eligible (<reason>), no anim lib — `<cmd>`? (optional; say the word, I'll add it)

Rules:

• Suggest-only, never auto-install. Run <cmd> ONLY on explicit user consent. BDR-005: mid-session + existing package.json = consent required — same contract as /onboard STEP 2.5, opposite of /init-project STEP 5e (auto-install on a just-validated fresh scaffold).
• Non-blocking. Never halts the build; NOT a second gate. The toolchain stop (§3, exit 10) is the only STOP. Surface the line, keep going.
• Stateless dedup, by construction. The suggestion is ALWAYS the single line above — no first-time-block / later-short split. That split would need session state the gate doesn't have, and a file marker would persist forever (per project, not per session). Determinism here comes from having nothing to remember, not from a behavioral "the agent recalls it" guard. Re-fire is one ignorable line, on a narrow population: condition 3 (is_anim_lib_installed, 10 libs incl gsap / react-spring / lottie) kills it the instant any anim lib lands, so only "eligible + pure-CSS + actively declined" ever sees it twice.
• Two "motion"s (agent-facing). The lib motion (npm dep, this step) ≠ the skill design-motion-principles (# GATE-BLOCK: core set, §2-3). The toolchain check handles the skill; this step handles the lib. Don't conflate them when talking to the user.

Other toolchains

The script defaults to the design profile. A task needing another profile's toolchain passes it: design-tool-gate.sh <profile>. Scope comes from that profile's # GATE-BLOCK: line (absent → every skill/plugin/mcp entry). The remedy is always /profile <that> — a profile, never a lone tool.

IMPORTANT

• Remedy is ALWAYS a profile (/profile design), never an atomic tool toggle — the profile system is the single source of truth for what's active.
• the 21st CLI is REQUIRED (it trips the gate) and /profile design cannot install it — the gate names the two commands; surface them to the user.
• The design-core set (what trips the gate) is declared in design.profile on the # GATE-BLOCK: line(s) — edit there to add/remove a blocking design tool, not in the script.
• The state check shells out to claude (plugin/mcp list): a few seconds. Trivial / non-design tasks skip it entirely (no signal, or trivial tier).
• design-tool-gate.sh's per-type state checks MIRROR profile.sh:skill_status() — change one, sync the other.
• Do NOT run this gate on pure backend/API/CLI tasks (no signals = no gate).