diff --git a/.github/workflows/ai-use-notice.yml b/.github/workflows/ai-use-notice.yml
index b669b97..11ee216 100644
--- a/.github/workflows/ai-use-notice.yml
+++ b/.github/workflows/ai-use-notice.yml
@@ -1,10 +1,17 @@
 name: AI use notice
-on: [push, pull_request]
+on:
+  pull_request:
+  push:
+    branches: [main]
 permissions:
   contents: read
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
 jobs:
   notice:
     runs-on: ubuntu-latest
+    timeout-minutes: 5
     steps:
       - uses: actions/checkout@v4
         with:
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d8f2ac1..aac69b5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,7 +1,13 @@
 name: Verify HangulScript
-on: [push, pull_request]
+on:
+  pull_request:
+  push:
+    branches: [main]
 permissions:
   contents: read
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
 jobs:
   verify:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/public-docs.yml b/.github/workflows/public-docs.yml
index 3873be6..10195f8 100644
--- a/.github/workflows/public-docs.yml
+++ b/.github/workflows/public-docs.yml
@@ -1,10 +1,17 @@
 name: Commit hygiene
-on: [push, pull_request]
+on:
+  pull_request:
+  push:
+    branches: [main]
 permissions:
   contents: read
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
 jobs:
   review:
     runs-on: ubuntu-latest
+    timeout-minutes: 5
     steps:
       - uses: actions/checkout@v4
         with: