diff --git a/.github/workflows/bundle-desktop-macos.yml b/.github/workflows/bundle-desktop-macos.yml
new file mode 100644
index 000000000..0e7111047
--- /dev/null
+++ b/.github/workflows/bundle-desktop-macos.yml
@@ -0,0 +1,77 @@
+# Reusable workflow to bundle the Sprout desktop app for macOS (arm64).
+# Called from release.yml — not triggered directly.
+on:
+  workflow_call:
+    inputs:
+      signing:
+        description: 'Whether to perform signing and notarization'
+        required: false
+        default: false
+        type: boolean
+      ref:
+        description: 'Git ref to checkout'
+        required: false
+        type: string
+        default: ''
+    secrets:
+      OSX_CODESIGN_ROLE:
+        required: false
+      CODESIGN_S3_BUCKET:
+        required: false
+
+name: Reusable workflow to bundle desktop app for macOS
+
+jobs:
+  bundle-desktop-macos:
+    runs-on: macos-latest
+    name: Bundle Desktop App (macOS arm64)
+    timeout-minutes: 45
+    permissions:
+      id-token: write
+      contents: read
+    steps:
+      - name: Checkout
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+        with:
+          ref: ${{ inputs.ref != '' && inputs.ref || '' }}
+
+      - name: Activate Hermit
+        uses: cashapp/activate-hermit@e49f5cb4dd64ff0b0b659d1d8df499595451155a # v1
+
+      - name: Cache Rust artifacts
+        uses: Swatinem/rust-cache@e18b497796c12c097a38f9edb9d0641fb99eee32 # v2
+        with:
+          workspaces: desktop/src-tauri
+
+      - name: Install desktop dependencies
+        run: just desktop-install-ci
+
+      - name: Build Tauri app
+        run: cd desktop && pnpm tauri build
+
+      - name: Codesign and Notarize
+        if: ${{ inputs.signing }}
+        id: codesign
+        uses: block/apple-codesign-action@v1.1.0
+        with:
+          osx-codesign-role: ${{ secrets.OSX_CODESIGN_ROLE }}
+          codesign-s3-bucket: ${{ secrets.CODESIGN_S3_BUCKET }}
+          unsigned-artifact-path: desktop/src-tauri/target/release/bundle/macos/Sprout.app
+          artifact-name: sprout-${{ github.sha }}-${{ github.run_id }}-arm64
+
+      - name: Package signed app
+        if: ${{ inputs.signing }}
+        env:
+          SIGNED_PATH: ${{ steps.codesign.outputs.signed-artifact-path }}
+        run: cp "$SIGNED_PATH" Sprout-darwin-arm64.zip
+
+      - name: Package unsigned app
+        if: ${{ !inputs.signing }}
+        run: ditto -c -k --keepParent desktop/src-tauri/target/release/bundle/macos/Sprout.app Sprout-darwin-arm64.zip
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
+        with:
+          name: Sprout-darwin-arm64
+          path: Sprout-darwin-arm64.zip
+          retention-days: 1
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 2edc6181f..733d83bca 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -14,10 +14,24 @@ concurrency:
 permissions: {}
 
 jobs:
-  build:
+  resolve:
     if: |
       (github.event_name == 'workflow_run' && github.event.workflow_run.conclusion == 'success') ||
       (github.event_name == 'workflow_dispatch' && github.ref == 'refs/heads/main')
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    outputs:
+      sha: ${{ steps.resolve.outputs.sha }}
+    steps:
+      - name: Resolve commit SHA
+        id: resolve
+        env:
+          WF_SHA: ${{ github.event.workflow_run.head_sha }}
+          FALLBACK_SHA: ${{ github.sha }}
+        run: echo "sha=${WF_SHA:-$FALLBACK_SHA}" >> "$GITHUB_OUTPUT"
+
+  build:
+    needs: resolve
     permissions:
       contents: read
     timeout-minutes: 30
@@ -31,17 +45,10 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - name: Resolve commit SHA
-        id: resolve
-        env:
-          WF_SHA: ${{ github.event.workflow_run.head_sha }}
-          FALLBACK_SHA: ${{ github.sha }}
-        run: echo "sha=${WF_SHA:-$FALLBACK_SHA}" >> "$GITHUB_OUTPUT"
-
       - name: Checkout
         uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
         with:
-          ref: ${{ steps.resolve.outputs.sha }}
+          ref: ${{ needs.resolve.outputs.sha }}
 
       - name: Activate Hermit
         uses: cashapp/activate-hermit@e49f5cb4dd64ff0b0b659d1d8df499595451155a # v1
@@ -84,25 +91,31 @@ jobs:
           path: sprout-*-canary-${{ matrix.target }}.tar.gz
           retention-days: 1
 
+  bundle-desktop-macos:
+    needs: resolve
+    uses: ./.github/workflows/bundle-desktop-macos.yml
+    permissions:
+      id-token: write
+      contents: read
+    with:
+      ref: ${{ needs.resolve.outputs.sha }}
+      signing: true
+    secrets:
+      OSX_CODESIGN_ROLE: ${{ secrets.OSX_CODESIGN_ROLE }}
+      CODESIGN_S3_BUCKET: ${{ secrets.CODESIGN_S3_BUCKET }}
+
   release:
-    needs: build
+    needs: [resolve, build, bundle-desktop-macos]
     runs-on: ubuntu-latest
     timeout-minutes: 10
     permissions:
       contents: write
 
     steps:
-      - name: Resolve commit SHA
-        id: resolve
-        env:
-          WF_SHA: ${{ github.event.workflow_run.head_sha }}
-          FALLBACK_SHA: ${{ github.sha }}
-        run: echo "sha=${WF_SHA:-$FALLBACK_SHA}" >> "$GITHUB_OUTPUT"
-
       - name: Checkout
         uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
         with:
-          ref: ${{ steps.resolve.outputs.sha }}
+          ref: ${{ needs.resolve.outputs.sha }}
 
       - name: Download all artifacts
         uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093 # v4
@@ -116,7 +129,7 @@ jobs:
 
       - name: Force-move canary tag
         env:
-          COMMIT_SHA: ${{ steps.resolve.outputs.sha }}
+          COMMIT_SHA: ${{ needs.resolve.outputs.sha }}
         run: |
           git tag -f canary "$COMMIT_SHA"
           git push origin canary --force
@@ -129,12 +142,13 @@ jobs:
           body: |
             Pre-alpha canary build. Not for production.
 
-            Built from commit `${{ steps.resolve.outputs.sha }}` at ${{ steps.timestamp.outputs.ts }}.
+            Built from commit `${{ needs.resolve.outputs.sha }}` at ${{ steps.timestamp.outputs.ts }}.
 
             **Relay**: `sprout-relay-canary-<target>.tar.gz`
             **Agent tooling** (ACP harness + MCP server): `sprout-agent-canary-<target>.tar.gz`
+            **Desktop** (macOS arm64): `Sprout-darwin-arm64.zip`
           prerelease: true
           allowUpdates: true
           removeArtifacts: true
-          artifacts: "dist/*.tar.gz"
+          artifacts: "dist/*.tar.gz,dist/*.zip"
           token: ${{ secrets.GITHUB_TOKEN }}