diff --git a/.github/workflows/close-stale-contributor-prs.yml b/.github/workflows/close-stale-contributor-prs.yml
index e01bc3881..43e699288 100644
--- a/.github/workflows/close-stale-contributor-prs.yml
+++ b/.github/workflows/close-stale-contributor-prs.yml
@@ -12,6 +12,8 @@ permissions:
 
 jobs:
   close-stale-contributor-prs:
+    # Prevent scheduled runs on forks
+    if: github.repository == 'openai/codex'
     runs-on: ubuntu-latest
     steps:
       - name: Close inactive PRs from contributors
diff --git a/.github/workflows/issue-deduplicator.yml b/.github/workflows/issue-deduplicator.yml
index c78b1f316..4b417ae59 100644
--- a/.github/workflows/issue-deduplicator.yml
+++ b/.github/workflows/issue-deduplicator.yml
@@ -9,7 +9,8 @@ on:
 jobs:
   gather-duplicates:
     name: Identify potential duplicates
-    if: ${{ github.event.action == 'opened' || (github.event.action == 'labeled' && github.event.label.name == 'codex-deduplicate') }}
+    # Prevent runs on forks (requires OpenAI API key, wastes Actions minutes)
+    if: github.repository == 'openai/codex' && (github.event.action == 'opened' || (github.event.action == 'labeled' && github.event.label.name == 'codex-deduplicate'))
     runs-on: ubuntu-latest
     permissions:
       contents: read
diff --git a/.github/workflows/issue-labeler.yml b/.github/workflows/issue-labeler.yml
index 424c7e726..da77812fe 100644
--- a/.github/workflows/issue-labeler.yml
+++ b/.github/workflows/issue-labeler.yml
@@ -9,7 +9,8 @@ on:
 jobs:
   gather-labels:
     name: Generate label suggestions
-    if: ${{ github.event.action == 'opened' || (github.event.action == 'labeled' && github.event.label.name == 'codex-label') }}
+    # Prevent runs on forks (requires OpenAI API key, wastes Actions minutes)
+    if: github.repository == 'openai/codex' && (github.event.action == 'opened' || (github.event.action == 'labeled' && github.event.label.name == 'codex-label'))
     runs-on: ubuntu-latest
     permissions:
       contents: read
diff --git a/.github/workflows/rust-release-prepare.yml b/.github/workflows/rust-release-prepare.yml
index b62a85505..c9f11f54f 100644
--- a/.github/workflows/rust-release-prepare.yml
+++ b/.github/workflows/rust-release-prepare.yml
@@ -14,6 +14,8 @@ permissions:
 
 jobs:
   prepare:
+    # Prevent scheduled runs on forks (no secrets, wastes Actions minutes)
+    if: github.repository == 'openai/codex'
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6