diff --git a/.github/copilot-instructions.md b/.github/copilot-instructions.md
index 41e07e4..2c72dc7 100644
--- a/.github/copilot-instructions.md
+++ b/.github/copilot-instructions.md
@@ -4,7 +4,7 @@ You are an expert GitHub Agentic Workflow generator. You help users create produ
 
 ## Your Knowledge
 
-Use the committed pattern library as the source of truth: `patterns/manifest.json` plus `patterns/archetypes/*.json` generated on 2026-09-28 from 563 source repos, 345 active workflows, and 929 total workflows scanned. The current wizard manifest lists 31 user-facing archetypes; the `custom` archetype exists as a supporting pattern file and is intentionally not exposed as a HOW-step archetype.
+Use the committed pattern library as the source of truth: `patterns/manifest.json` plus `patterns/archetypes/*.json` generated on 2026-09-28 from 563 source repos, 345 active workflows, and 929 total workflows scanned. The current wizard manifest lists 32 user-facing archetypes; the `custom` archetype exists as a supporting pattern file and is intentionally not exposed as a HOW-step archetype.
 
 ### Key Data Points
 
@@ -24,7 +24,7 @@ Use the committed pattern library as the source of truth: `patterns/manifest.jso
 - `custom` is hidden from the wizard archetype cards but retained for matching and profile data. Best observed custom profiles are schedule + create-pull-request + noop at 95.2% (n=21), schedule + create-issue + noop + threat-detection at 83.9%, and schedule + create-issue + noop at 80.0%.
 
 **Curated archetypes without empirical runs yet (`count: 0`):**
-- accessibility-expert, agent-cost-tracker, backlog-drip, batched-ci-doctor, ci-failure-triage, code-health-auditor, community-digest, contribution-guidelines-checker, issue-hierarchy-manager, link-checker, linter-applier, linter-miner, linter-refiner, linter-workflows, nitpick-reviewer, performance-nut, pr-fix-assistant, pr-iteration-loop, repo-qa-assistant, security-scanner, user-simulator.
+- accessibility-expert, agent-cost-tracker, backlog-drip, batched-ci-doctor, ci-failure-triage, code-health-auditor, community-digest, contribution-guidelines-checker, issue-hierarchy-manager, link-checker, linter-applier, linter-miner, linter-refiner, linter-workflows, nitpick-reviewer, performance-nut, pr-fix-assistant, pr-iteration-loop, repo-qa-assistant, responsive-docs-tester, security-scanner, user-simulator.
 - Keep these archetypes available. They are newer curated patterns and should not be removed simply because they have no measured success rate.
 
 **Trigger combo risk:**
diff --git a/patterns/archetypes/responsive-docs-tester.json b/patterns/archetypes/responsive-docs-tester.json
new file mode 100644
index 0000000..0322b8e
--- /dev/null
+++ b/patterns/archetypes/responsive-docs-tester.json
@@ -0,0 +1,37 @@
+{
+  "id": "responsive-docs-tester",
+  "label": "Responsive Docs Tester",
+  "description": "Build and serve a local web app or docs site, then test it with Playwright across mobile, tablet, and desktop viewports on a recurring schedule",
+  "success_rate": null,
+  "count": 0,
+  "recommended_triggers": [
+    {
+      "type": "schedule",
+      "config": {}
+    }
+  ],
+  "recommended_safe_outputs": [
+    "issues"
+  ],
+  "recommended_tools": [
+    "create-issue"
+  ],
+  "timeout_minutes": 30,
+  "prompt_style": "phase-based",
+  "size_range_bytes": [
+    4000,
+    8000
+  ],
+  "top_repos": [],
+  "tips": [
+    "Build and start the app or docs site locally in a pre-step, then poll localhost until the server responds before Playwright navigates to it",
+    "Test a small, named set of representative viewports (e.g. one mobile, one tablet, one desktop size) rather than an open-ended device list",
+    "Use playwright-cli commands in bash (browser_resize, browser_navigate, browser_snapshot) instead of installing Playwright as an npm dependency",
+    "Check navigation usability, content overflow, image sizing, and basic accessibility (headings, alt text, contrast) at each viewport, not just that the page loads",
+    "Capture screenshots only on failure and publish them with the upload-asset safe output so evidence is attached without bloating the report",
+    "Always stop the local preview server in a cleanup step even if earlier steps fail",
+    "Call noop when every viewport passes instead of leaving no output",
+    "Set expires and close-older-issues (or skip-if-match) on create-issue so scheduled runs don't accumulate duplicate reports"
+  ],
+  "anti_patterns": []
+}
diff --git a/patterns/manifest.json b/patterns/manifest.json
index 2f299f8..fdf814d 100644
--- a/patterns/manifest.json
+++ b/patterns/manifest.json
@@ -36,7 +36,8 @@
     "repo-qa-assistant",
     "nitpick-reviewer",
     "pr-fix-assistant",
-    "backlog-drip"
+    "backlog-drip",
+    "responsive-docs-tester"
   ],
   "workflow_generation": "workflow-generation.json",
   "anti_patterns": [
diff --git a/patterns/workflow-generation.json b/patterns/workflow-generation.json
index a9faea6..3bebc9d 100644
--- a/patterns/workflow-generation.json
+++ b/patterns/workflow-generation.json
@@ -503,6 +503,43 @@
         "- **DO NOT** duplicate existing review comments."
       ]
     },
+    "responsive-docs-tester": {
+      "icon": "device-desktop",
+      "capabilities": {
+        "bash": true,
+        "browser": true,
+        "network": true
+      },
+      "permissions": [
+        "contents",
+        "issues",
+        "pull-requests"
+      ],
+      "instructions": [
+        "https://raw.githubusercontent.com/github/gh-aw/main/docs/src/content/docs/reference/playwright.md",
+        "syntax-tools-imports.md"
+      ],
+      "body": [
+        "# {{label}}",
+        "",
+        "You are a **responsive site tester** for this repository's web app or documentation site.",
+        "",
+        "## Process",
+        "",
+        "1. Build the site and start it locally in the background, polling `localhost` until it responds",
+        "2. Resize to a small, named set of mobile, tablet, and desktop viewports using `playwright-cli`",
+        "3. At each viewport, check that the page loads, navigation is usable, content does not overflow, images are sized correctly, and basic accessibility (headings, alt text, contrast) holds",
+        "4. Capture a screenshot only when a check fails, and publish it with `upload-asset`",
+        "5. Stop the local preview server before finishing, even if earlier steps failed",
+        "6. Report findings in a single issue grouped by severity, or call `noop` when every viewport passes",
+        "",
+        "## Constraints",
+        "",
+        "- **DO NOT** install Playwright as an npm dependency \u2014 use the `playwright-cli` bash commands only.",
+        "- **DO NOT** leave the preview server running after the workflow finishes.",
+        "- **DO NOT** report a finding already covered by an existing open issue from this workflow."
+      ]
+    },
     "performance-nut": {
       "icon": "graph",
       "capabilities": {