diff --git a/.mokogitea/workflows/pr-check.yml b/.mokogitea/workflows/pr-check.yml
index c834bf5f8b..2e583fb354 100644
--- a/.mokogitea/workflows/pr-check.yml
+++ b/.mokogitea/workflows/pr-check.yml
@@ -146,12 +146,21 @@ jobs:
 
       - name: Detect platform
         id: platform
+        env:
+          MOKOGITEA_TOKEN: ${{ secrets.MOKOGITEA_TOKEN }}
+          MOKOGITEA_URL: ${{ vars.GITEA_URL || 'https://git.mokoconsulting.tech' }}
+          REPO: ${{ github.repository }}
         run: |
-          # Read platform from XML manifest (<platform> tag) or plain text fallback
-          PLATFORM=$(sed -n 's/.*<platform>\([^<]*\)<\/platform>.*/\1/p' .mokogitea/manifest.xml 2>/dev/null | head -1)
-          [ -z "$PLATFORM" ] && PLATFORM=$(cat .mokogitea/manifest.xml 2>/dev/null | tr -d '[:space:]')
+          # Query metadata API for platform (manifest.xml is deprecated)
+          PLATFORM=""
+          if [ -n "$MOKOGITEA_TOKEN" ]; then
+            PLATFORM=$(curl -sf -H "Authorization: token ${MOKOGITEA_TOKEN}" \
+              "${MOKOGITEA_URL}/api/v1/repos/${REPO}/metadata" 2>/dev/null \
+              | sed -n 's/.*"platform"\s*:\s*"\([^"]*\)".*/\1/p' | head -1) || true
+          fi
           [ -z "$PLATFORM" ] && PLATFORM="generic"
           echo "platform=$PLATFORM" >> "$GITHUB_OUTPUT"
+          echo "Detected platform: $PLATFORM"
 
       - name: Setup PHP
         if: steps.platform.outputs.platform == 'joomla' || steps.platform.outputs.platform == 'dolibarr'
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 13d1a98dd2..de077a3c4a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -56,6 +56,7 @@
 - Cherry-pick upstream v1.26.4: walk git log context error handling — regression fix (#38185)
 
 ### Fixed
+- PR check: platform detection now queries metadata API instead of removed manifest.xml
 - Cherry-pick upstream v1.26.2: handle empty pull request files view to allow reviews (#37783)
 - Cherry-pick upstream v1.26.2: fix "run as root" check with snap container detection (#37622)
 - Cherry-pick upstream: ack re-sent UpdateLog finalize idempotently (#37885)