diff --git a/.github/workflows/generate-tool-specs.yml b/.github/workflows/generate-tool-specs.yml
index 717135938..ff078ba8f 100644
--- a/.github/workflows/generate-tool-specs.yml
+++ b/.github/workflows/generate-tool-specs.yml
@@ -14,6 +14,7 @@ permissions:
 
 jobs:
   generate-specs:
+    if: github.event_name == 'workflow_dispatch' || github.event.pull_request.head.repo.full_name == github.repository
     runs-on: ubuntu-latest
     env:
       PYTHONUNBUFFERED: 1