diff --git a/.github/workflows/desktop-release.yml b/.github/workflows/desktop-release.yml
index 1676d716..74dfc038 100644
--- a/.github/workflows/desktop-release.yml
+++ b/.github/workflows/desktop-release.yml
@@ -40,6 +40,11 @@ jobs:
         with:
           fetch-depth: 0
 
+      - name: Configure native capture display
+        run: |
+          swift scripts/native-ui/hosted-display.swift --configure-hosted
+          swift scripts/native-ui/hosted-display.swift --check
+
       - uses: pnpm/action-setup@0977fd99725f1db4007ccb2928dbb4e90d06cc86 # v6.0.10
 
       - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
diff --git a/docs/design/DOCUMENTATION-MEDIA-CONTRACT.md b/docs/design/DOCUMENTATION-MEDIA-CONTRACT.md
index da618f0b..205690aa 100644
--- a/docs/design/DOCUMENTATION-MEDIA-CONTRACT.md
+++ b/docs/design/DOCUMENTATION-MEDIA-CONTRACT.md
@@ -41,3 +41,5 @@ Permitted post-build changes are regular, non-executable README/documentation Ma
 The optional `focusedBoardAssets` capture list permits only `board-5000.png`, at 1360×900 native content pixels. It has the same build, app digest, timestamp, byte-hash and committed-file requirements as the maintained captures. A published focused image requires its original capture entry.
 
 Run `node --import tsx ../scripts/native-ui/board-performance.mjs <candidate.app> <new-evidence-directory>` from `server/`. After that feature run passes, supply its `report.json` as the final argument to `pnpm docs:capture-media <candidate.app> <new-capture-directory> capture <board-report.json>`. The capture command verifies the same candidate identity and original screenshot hash before incorporating the focused image. This supplements the fourteen maintained assets and ten task-mode views; it does not replace them.
+
+The signed workflow configures its disposable macOS runner to an available, unscaled 1920×1080 display mode before building. The setting lasts only for that runner login session. `swift scripts/native-ui/hosted-display.swift --check` is read-only and verifies the display prerequisite locally; `--configure-hosted` is restricted to GitHub Actions. Native acceptance records the actual display work area and fails before the matrix if it cannot contain the retained capture sizes.
diff --git a/scripts/native-ui/contract.mjs b/scripts/native-ui/contract.mjs
index 3c4f6917..bf5ddb8d 100644
--- a/scripts/native-ui/contract.mjs
+++ b/scripts/native-ui/contract.mjs
@@ -36,8 +36,8 @@ export const settingsSections = [
   'Maintenance',
 ];
 export const contentSizes = {
-  // Hosted macOS runners expose only 760px of usable content height. Keep the
-  // expanded width while using a height the native window manager can honor.
+  // Retain the original matched capture sizes. The hosted workflow configures
+  // a 1920x1080 display before packaging; default runner displays can be smaller.
   normal: { width: 1700, height: 760 },
   minimum: { width: 1180, height: 760 },
 };
diff --git a/scripts/native-ui/hosted-display.swift b/scripts/native-ui/hosted-display.swift
new file mode 100644
index 00000000..7a25da2d
--- /dev/null
+++ b/scripts/native-ui/hosted-display.swift
@@ -0,0 +1,47 @@
+import CoreGraphics
+import Foundation
+
+func fail(_ message: String) -> Never {
+    FileHandle.standardError.write(Data((message + "\n").utf8))
+    exit(1)
+}
+
+let argument = CommandLine.arguments.dropFirst().first ?? "--check"
+guard ["--check", "--configure-hosted"].contains(argument) else {
+    fail("Usage: swift scripts/native-ui/hosted-display.swift [--check|--configure-hosted]")
+}
+let display = CGMainDisplayID()
+if argument == "--configure-hosted" {
+    guard ProcessInfo.processInfo.environment["GITHUB_ACTIONS"] == "true" else {
+        fail("Display configuration is restricted to the disposable GitHub Actions runner")
+    }
+    let modes = CGDisplayCopyAllDisplayModes(display, nil) as? [CGDisplayMode] ?? []
+    guard let mode = modes.first(where: {
+        $0.width == 1920 && $0.height == 1080 && $0.pixelWidth == 1920 && $0.pixelHeight == 1080
+    }) else {
+        fail("Runner has no unscaled 1920x1080 mode. Available: " + modes.map {
+            "\($0.width)x\($0.height) (\($0.pixelWidth)x\($0.pixelHeight) pixels)"
+        }.joined(separator: ", "))
+    }
+    var configuration: CGDisplayConfigRef?
+    guard CGBeginDisplayConfiguration(&configuration) == .success, let configuration else {
+        fail("Cannot begin runner display configuration")
+    }
+    guard CGConfigureDisplayWithDisplayMode(configuration, display, mode, nil) == .success else {
+        CGCancelDisplayConfiguration(configuration)
+        fail("Cannot select runner display mode")
+    }
+    guard CGCompleteDisplayConfiguration(configuration, .forSession) == .success else {
+        fail("Cannot apply runner display mode for this login session")
+    }
+}
+guard let actual = CGDisplayCopyDisplayMode(display) else { fail("No active display mode") }
+let evidence: [String: Any] = [
+    "width": actual.width, "height": actual.height,
+    "pixelWidth": actual.pixelWidth, "pixelHeight": actual.pixelHeight,
+    "configured": argument == "--configure-hosted"
+]
+print(String(data: try JSONSerialization.data(withJSONObject: evidence, options: [.sortedKeys]), encoding: .utf8)!)
+guard actual.width >= 1920 && actual.height >= 1080 else {
+    fail("Native capture requires at least 1920x1080 logical display points")
+}
diff --git a/scripts/native-ui/run.mjs b/scripts/native-ui/run.mjs
index b44c7185..44788beb 100644
--- a/scripts/native-ui/run.mjs
+++ b/scripts/native-ui/run.mjs
@@ -685,6 +685,15 @@ async function checkSeededRendererFailures() {
 }
 try {
   await launch();
+  report.display = await app.evaluate(({ screen }) => {
+    const { bounds, workArea, scaleFactor } = screen.getPrimaryDisplay();
+    return { bounds, workArea, scaleFactor };
+  });
+  await persist();
+  assert(
+    report.display.workArea.width >= 1780 && report.display.workArea.height >= 960,
+    'Native capture needs a work area of at least 1780x960; configure the runner display first'
+  );
   report.titlebarAction = await verifyConfiguredTitlebarAction(app, page);
   report.menuCommands = await verifyNativeMenuCommands(app, page);
   report.settingsWindow = await verifyNativeSettingsWindow(app, page);