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+> **Type:** Change Proposal Implementation
+> **Version:** V5.6.0
+> **Status:** In Progress
+> **Date:** 2026-02-01
+> **Origin:** [Proposal](https://gitea.hotserv.cloud/personal-projects/leo-claude-mktplace/wiki/Change-V5.6.0%3A-Domain-Advisory-Pattern-Proposal)
+> **Sprint:** Sprint 9
+
+# Implementation Details
+
+Sprint 9 delivers the full domain advisory pattern for viz-platform, including the projman skill that serves as the reusable backbone for all future domain integrations.
+
+## Scope
+
+### Files to Create (5)
+
+| File | Risk | Description |
+|------|------|-------------|
+| `plugins/projman/skills/domain-consultation.md` | Medium | Core integration skill - detection rules, consultation protocol, gate logic |
+| `plugins/viz-platform/agents/design-reviewer.md` | Low | Review agent using MCP tools for design system compliance |
+| `plugins/viz-platform/commands/design-review.md` | Low | Standalone command: `/design-review <path>` |
+| `plugins/viz-platform/commands/design-gate.md` | Low | Binary pass/fail: `/design-gate <path>` |
+| `plugins/viz-platform/skills/design-system-audit.md` | Low | Audit rules, severity levels, violation patterns |
+
+### Files to Modify (7)
+
+| File | Risk | Description |
+|------|------|-------------|
+| `plugins/projman/agents/planner.md` | Medium | Add skill load + domain consultation step |
+| `plugins/projman/agents/orchestrator.md` | Medium | Add skill load + domain gate check step |
+| `plugins/projman/skills/label-taxonomy/labels-reference.md` | Low | Add Domain/Viz and Domain/Data labels |
+| `plugins/viz-platform/.claude-plugin/plugin.json` | Low | Verify commands auto-discovery |
+| `.claude-plugin/marketplace.json` | Low | Bump to 5.6.0 |
+| `CHANGELOG.md` | Low | Add v5.6.0 entry |
+| `README.md` | Low | Update version, add domain advisory section |
+
+## Implementation Specifications
+
+### 1. domain-consultation.md (projman skill)
+
+**Sections:**
+- Purpose: Enable projman to consult domain-specific plugins
+- When to Use: Planning phase for domain detection, execution phase for gates
+- Domain Detection Rules:
+  - viz-platform: `plugins/viz-platform/**`, `*.dash.py`, keywords: dashboard, chart, theme
+  - data-platform: `plugins/data-platform/**`, `*.sql`, keywords: dataframe, query, pipeline
+- Planning Protocol: Detect domains, present considerations, adjust labels
+- Execution Gate Protocol: Run domain gates before issue completion
+- Review Protocol: Include domain compliance in review summary
+- Extensibility: How to add new domains
+
+### 2. design-reviewer.md (viz-platform agent)
+
+**MCP Tools Used:**
+- `validate_component` - Check component prop validity
+- `get_component_props` - Get expected props for component
+- `theme_validate` - Validate theme configuration
+- `accessibility_validate_colors` - Check color contrast
+- `accessibility_validate_theme` - Full accessibility audit
+
+**Output Format:**
+```
+Design System Audit Report
+==========================
+Path: <scanned path>
+Files Scanned: N
+Violations Found: N
+
+FAIL: [component.py:42] Invalid prop 'colour' - did you mean 'color'?
+WARN: [theme.py:15] Color contrast ratio 3.8:1 below AA standard (4.5:1)
+INFO: [layout.py:8] Consider using responsive breakpoints for mobile
+```
+
+### 3. design-system-audit.md (viz-platform skill)
+
+**What to Check:**
+- Component prop validity (typos, invalid values)
+- Theme token usage (hardcoded colors vs theme tokens)
+- Accessibility (color contrast, ARIA labels)
+- Responsive design (breakpoint usage)
+
+**Severity Classification:**
+- FAIL: Breaking issues (invalid props, missing required)
+- WARN: Quality issues (accessibility, best practices)
+- INFO: Suggestions (optimizations, patterns)
+
+### 4. design-review.md and design-gate.md (commands)
+
+**design-review:** Detailed audit mode, shows all findings with context
+**design-gate:** Returns 0 (pass) or 1 (fail), used by orchestrator
+
+### 5. Label Taxonomy Extension
+
+| Label | Color | Description |
+|-------|-------|-------------|
+| `Domain/Viz` | #7c4dff | Work involves visualization/dashboard domain |
+| `Domain/Data` | #00bfa5 | Work involves data engineering domain |
+
+## Dependencies
+
+```
+#1 domain-consultation.md
+    |
+    +-- #6 planner.md (depends on #1)
+    +-- #7 orchestrator.md (depends on #1)
+           |
+           +-- #5 design-gate.md (must exist before orchestrator uses it)
+                  |
+                  +-- #3 design-reviewer.md (agent called by gate)
+                         |
+                         +-- #2 design-system-audit.md (skill loaded by agent)
+
+#4 design-review.md (independent - standalone command)
+#8 labels + version + docs (can run last)
+```
+
+## Issues
+
+Issues will be created and linked here after planning approval.
+
+## Validation Checklist
+
+- [ ] Run `./scripts/validate-marketplace.sh`
+- [ ] Run `./scripts/verify-hooks.sh`
+- [ ] Run `/validate-contracts`
+- [ ] Run `/labels-sync` (after Domain labels added)
+- [ ] Verify design-reviewer agent auto-discovered
+- [ ] Verify commands discoverable
+- [ ] Test `/design-review` against real viz-platform code