diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index d22b6868..6927ba1a 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -1,9 +1,7 @@
 name: Rust
 
-# Rust lives in src-tauri and is only compiled during a release build, so its
-# unit tests, clippy, and fmt never gated a PR. This runs them on every change
-# that touches the crate. Path-filtered so pure-frontend PRs don't pay the
-# (heavy) Tauri dependency compile.
+# src-tauri gets no other PR gate, because Rust and the packaging data only matter in a release build.
+# Path-filtered because the Tauri dependency compile is too heavy for pure-frontend PRs.
 on:
   pull_request:
     branches: [main, prod]
@@ -17,8 +15,15 @@ defaults:
     working-directory: ./src-tauri
 
 jobs:
-  # Format check is platform-independent (rustfmt parses, doesn't compile), so
-  # run it once instead of per matrix platform.
+  # Nothing in the release build validates the metainfo, so this job is its only gate.
+  metainfo:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v7
+      - run: sudo apt-get update && sudo apt-get install -y appstream
+      - run: appstreamcli validate --no-net packaging/linux/de.u8array.zplab.metainfo.xml
+
+  # rustfmt parses without compiling, so one run covers every matrix platform.
   fmt:
     runs-on: ubuntu-latest
     steps:
diff --git a/src-tauri/packaging/flatpak/de.u8array.zplab.yml b/src-tauri/packaging/flatpak/de.u8array.zplab.yml
index 6be47233..f0d87498 100644
--- a/src-tauri/packaging/flatpak/de.u8array.zplab.yml
+++ b/src-tauri/packaging/flatpak/de.u8array.zplab.yml
@@ -1,4 +1,4 @@
-# Flathub manifest. Flathub builds this itself from the release deb, release.yml has no Flatpak leg.
+# Flathub manifest. Flathub builds it from the release deb, so release.yml has no Flatpak leg.
 app-id: de.u8array.zplab
 runtime: org.gnome.Platform
 runtime-version: "50"
@@ -33,6 +33,8 @@ modules:
       # Tauri files the 256 px icon under a size no theme lookup reads.
       - install -Dm644 usr/share/icons/hicolor/256x256@2/apps/ZPLab.png /app/share/icons/hicolor/256x256/apps/ZPLab.png
       - install -Dm644 de.u8array.zplab.metainfo.xml /app/share/metainfo/de.u8array.zplab.metainfo.xml
+      # sed -i reports success on no match, so a missed rename would ship an unresolved launchable.
+      - grep -q '<launchable type="desktop-id">ZPLab.desktop</launchable>' /app/share/metainfo/de.u8array.zplab.metainfo.xml
       # The packaged metainfo launches the deb's desktop file name.
       - sed -i 's#<launchable type="desktop-id">ZPLab.desktop</launchable>#<launchable type="desktop-id">de.u8array.zplab.desktop</launchable>#' /app/share/metainfo/de.u8array.zplab.metainfo.xml
     sources:
diff --git a/src-tauri/tauri.conf.json b/src-tauri/tauri.conf.json
index 99f3bd75..66732ae5 100644
--- a/src-tauri/tauri.conf.json
+++ b/src-tauri/tauri.conf.json
@@ -58,6 +58,11 @@
       "icons/icon.ico"
     ],
     "linux": {
+      "appimage": {
+        "files": {
+          "/usr/share/metainfo/de.u8array.zplab.metainfo.xml": "packaging/linux/de.u8array.zplab.metainfo.xml"
+        }
+      },
       "deb": {
         "files": {
           "/usr/lib/udev/rules.d/70-zplab.rules": "packaging/udev/70-zplab.rules",