Spec-Driven UI Generation

Generate front-end user interface specifications and code through an interactive, constraint-aware 9-phase workflow with structural anti-skip enforcement.

Context files are THE LAW: tech-stack.md, source-tree.md, dependencies.md, coding-standards.md, architecture-constraints.md, anti-patterns.md

If ambiguous or conflicts detected: HALT and use AskUserQuestion

Execution Model

This skill expands inline. After invocation, execute Phase State Initialization immediately. Do not wait passively, ask permission, or offer execution options.

Self-Check (if ANY box is true = VIOLATION):

• Stopping to ask about token budget
• Stopping to offer execution options
• Waiting passively for results
• Asking "should I execute this?"
• Skipping a phase because "it seems simple"
• Combining multiple phases into one
• Summarizing instead of loading a reference file
• Skipping verification because "I already wrote the file"

IF any box checked: EXECUTION MODEL VIOLATION. Go directly to Phase State Initialization now.

Anti-Skip Enforcement Contract

This skill enforces 4 independent anti-skip layers. ALL FOUR must fail for a step to be skipped:

1. Per-phase reference loading — Each phase loads its reference files FRESH via Read() (not consolidated from memory)
2. Binary CLI gates — devforgeai-validate phase-check/phase-complete/phase-record (compiled binary, cannot be forged by LLM)
3. Checkpoint-based state tracking — Phase state JSON tracks current_phase, phases_completed, steps_completed
4. Artifact verification — Phase state file verified via Glob(), outputs verified on disk via Grep()

Execute-Verify-Record Pattern: Every mandatory step in every phase file has three parts:

• EXECUTE: The exact action to perform (Read, Write, Glob, Grep, Bash, Task, AskUserQuestion)
• VERIFY: How to confirm the action happened (file exists, content matches, exit code, data key populated)
• RECORD: CLI command to record completion (devforgeai-validate phase-record)

Token Optimization Bias is PROHIBITED. Do not skip, compress, or shortcut any step. Every phase step exists because a previous failure proved it necessary. (Reference: RCA-001, RCA-002, STORY-457)

Phase State Initialization

Before any phase executes, initialize phase state tracking.

EXECUTE:

Bash(command="devforgeai-validate phase-init ${IDENTIFIER} --workflow=ui --project-root=. 2>&1")

Where ${IDENTIFIER} is ${STORY_ID} (e.g., STORY-042) for story mode, or UI-STANDALONE for standalone mode.

VERIFY: Exit code 0 or 2 (exit code 2 = identifier format not recognized, proceed with backward compatibility).

If exit code 127: CLI not installed. Continue without CLI gates but execute ALL phases and steps regardless.

Phase Orchestration

All 9 phases execute for every invocation. There is no mode-conditional phase skipping.

active_phases = ["00", "01", "02", "03", "04", "05", "06", "07", "08"]

FOR phase_num in active_phases:
  1. ENTRY GATE: Verify previous phase completed (check phase state or first phase)
  2. LOAD: Read(file_path="src/claude/skills/spec-driven-ui/phases/phase-{phase_num}-{name}.md")
     - If Read fails, try: Read(file_path=".claude/skills/spec-driven-ui/phases/phase-{phase_num}-{name}.md")
  3. EXECUTE: Follow ALL EVR triplets in the phase file — no skipping
  4. RECORD: devforgeai-validate phase-record ${IDENTIFIER} --phase={phase_num} --project-root=. 2>&1
  5. EXIT GATE: Verify phase artifacts exist before proceeding

CRITICAL: Execute EVERY step in EVERY phase. ALL steps within each phase are mandatory.

Phase Index

Command Integration

This skill is invoked by /create-ui with context markers:

/create-ui context markers:

**Mode:** ${MODE}
**Target:** ${STORY_ID or COMPONENT_DESCRIPTION}

Where MODE is "story" (with STORY-ID) or "standalone" (with component description text).

Subagent Coordination

ui-spec-formatter (Phase 06, Step 6.5)

• Validates generated specifications against framework constraints
• Formats results for user-facing display
• Returns structured JSON with SUCCESS/PARTIAL/FAILED status
• Respects framework guardrails (see references/ui-result-formatting-guide.md)

Integration Points

Invoked by:

• /create-ui command (user-initiated)
• devforgeai-orchestration (when story has UI requirements)
• spec-driven-dev (during implementation)

Invokes:

• ui-spec-formatter subagent (Phase 06 Step 6.5)

Provides output to:

• spec-driven-dev (UI specs for implementation)
• spec-driven-qa (UI specs for validation)

Reference Files Index

Each phase loads only its required references. No consolidated loading.

Quality Standards

Generated UI code must:

• Follow coding-standards.md conventions
• Use technologies from tech-stack.md only
• Place files per source-tree.md
• Enforce the 8-point spatial grid and semantic color tokens from design-system-rules.md
• Apply the AESTHETIC_VIBE selected in Phase 03 (within design system constraints)
• Meet WCAG 2.1 AA accessibility standards from accessibility-guidelines.md
• Structure components per Smart/Dumb patterns from component-anatomy.md
• Include accessibility (ARIA, semantic HTML, keyboard navigation)
• Match story acceptance criteria (story mode)
• Apply best practices from type-specific reference files

Success Criteria

Token Efficiency

Target: ~40,000 tokens per component (with EVR enforcement overhead)

Efficiency achieved through:

• Native tool usage (Read/Write/Edit not Bash)
• Progressive per-phase reference loading (not consolidated)
• Load only UI type-specific best practices (web OR gui OR tui — not all three)
• Context validation once at Phase 01
• Focused generation per component

Error Handling

Common errors and recovery:

1. Context files missing → Direct to /create-context
2. Technology conflict with tech-stack.md → AskUserQuestion for resolution
3. Template not found → Validate assets directory, offer alternatives
4. Validation failures → User resolves via Phase 07 AskUserQuestion flows

See references/error-handling.md for complete recovery procedures.

Change Log

Created: 2026-03-18 Migrated from: devforgeai-ui-generator Pattern: Spec-driven skill with Execute-Verify-Record anti-skip enforcement