diff --git a/.github/workflows/chain-endpoints.yml b/.github/workflows/chain-endpoints.yml
index 496d71f..2150ffe 100644
--- a/.github/workflows/chain-endpoints.yml
+++ b/.github/workflows/chain-endpoints.yml
@@ -6,6 +6,12 @@ on:
     # once daily (early mornings, 02:50 GMT, generally not busy)
     - cron:  '50 2 * * *'
 
+
+# GITHUB_TOKEN only opens an issue when the endpoint check fails.
+permissions:
+  contents: read
+  issues: write
+
 jobs:
   endpoints:
     if: github.repository == 'pezkuwichain/pezkuwi-apps'
diff --git a/.github/workflows/lock.yml b/.github/workflows/lock.yml
index 978c680..cba69fb 100644
--- a/.github/workflows/lock.yml
+++ b/.github/workflows/lock.yml
@@ -5,6 +5,13 @@ on:
   schedule:
     - cron: '15 2/3 * * *'
 
+
+# dessant/lock-threads locks closed issues, PRs and discussions.
+permissions:
+  issues: write
+  pull-requests: write
+  discussions: write
+
 jobs:
   lock:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/pr-any.yml b/.github/workflows/pr-any.yml
index b751dbe..c7f5f92 100644
--- a/.github/workflows/pr-any.yml
+++ b/.github/workflows/pr-any.yml
@@ -1,6 +1,11 @@
 name: PR
 on: [pull_request]
 
+
+# Read-only token: no step writes through GITHUB_TOKEN.
+permissions:
+  contents: read
+
 jobs:
   pr:
     strategy:
diff --git a/.github/workflows/test-nightly.yml b/.github/workflows/test-nightly.yml
index d7d2ea3..9128839 100644
--- a/.github/workflows/test-nightly.yml
+++ b/.github/workflows/test-nightly.yml
@@ -5,6 +5,11 @@ on:
     - cron:  '1 5 * * *'
 
 
+
+# Read-only token: no step writes through GITHUB_TOKEN.
+permissions:
+  contents: read
+
 jobs:
   alltests:
     strategy: