diff --git a/.github/workflows/opengrep-precise.yml b/.github/workflows/opengrep-precise.yml
index 16c387ae6aec..5b6269b2f403 100644
--- a/.github/workflows/opengrep-precise.yml
+++ b/.github/workflows/opengrep-precise.yml
@@ -37,7 +37,7 @@ jobs:
   scan:
     name: Scan changed paths (precise)
     if: ${{ !github.event.pull_request.draft }}
-    runs-on: ${{ vars.OPENCLAW_CI_RUNNER_BACKEND == 'github' && 'ubuntu-24.04' || 'blacksmith-4vcpu-ubuntu-2404' }}
+    runs-on: ${{ vars.OPENCLAW_CI_RUNNER_BACKEND == 'github' && 'ubuntu-24.04' || github.event.pull_request.head.repo.full_name == 'openclaw/openclaw' && 'blacksmith-4vcpu-ubuntu-2404' || 'ubuntu-24.04' }}
     timeout-minutes: 30
     steps:
       - name: Checkout
diff --git a/.github/workflows/plugin-init-scaffold-validation.yml b/.github/workflows/plugin-init-scaffold-validation.yml
index 8839cb94bd86..600bf002cfcd 100644
--- a/.github/workflows/plugin-init-scaffold-validation.yml
+++ b/.github/workflows/plugin-init-scaffold-validation.yml
@@ -36,7 +36,7 @@ jobs:
   validate-provider-scaffold:
     name: Validate provider scaffold
     if: github.event_name != 'pull_request' || !github.event.pull_request.draft
-    runs-on: ${{ vars.OPENCLAW_CI_RUNNER_BACKEND == 'github' && 'ubuntu-24.04' || (github.repository == 'openclaw/openclaw' && 'blacksmith-4vcpu-ubuntu-2404' || 'ubuntu-24.04') }}
+    runs-on: ${{ vars.OPENCLAW_CI_RUNNER_BACKEND == 'github' && 'ubuntu-24.04' || (github.repository == 'openclaw/openclaw' && (github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name == 'openclaw/openclaw') && 'blacksmith-4vcpu-ubuntu-2404' || 'ubuntu-24.04') }}
     timeout-minutes: 30
     steps:
       - name: Checkout
diff --git a/.github/workflows/sandbox-common-smoke.yml b/.github/workflows/sandbox-common-smoke.yml
index 311c0c93ef25..ad8faaa000bc 100644
--- a/.github/workflows/sandbox-common-smoke.yml
+++ b/.github/workflows/sandbox-common-smoke.yml
@@ -27,7 +27,7 @@ env:
 jobs:
   sandbox-common-smoke:
     if: github.event_name != 'pull_request' || !github.event.pull_request.draft
-    runs-on: ${{ vars.OPENCLAW_CI_RUNNER_BACKEND == 'github' && 'ubuntu-24.04' || 'blacksmith-16vcpu-ubuntu-2404' }}
+    runs-on: ${{ vars.OPENCLAW_CI_RUNNER_BACKEND == 'github' && 'ubuntu-24.04' || (github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name == 'openclaw/openclaw') && 'blacksmith-16vcpu-ubuntu-2404' || 'ubuntu-24.04' }}
     timeout-minutes: 45
     steps:
       - name: Checkout