diff --git a/.github/workflows/external_pr.yml b/.github/workflows/external_pr.yml
new file mode 100644
index 0000000..c0365ef
--- /dev/null
+++ b/.github/workflows/external_pr.yml
@@ -0,0 +1,37 @@
+name: Validate external Pull Request
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+env:
+  LOCAL_PR: ${{ github.event.pull_request.head.repo.full_name == github.repository }}
+
+jobs:
+  variables: # env variables are not accessible through job.if (https://stackoverflow.com/q/73558652)
+    runs-on: ubuntu-latest
+    outputs:
+      LOCAL_PR: ${{ steps.init.outputs.LOCAL_PR }}
+    steps:
+      - name: Make environment variables global
+        id: init
+        run: |
+          echo "LOCAL_PR=${{ env.LOCAL_PR }}" >> $GITHUB_OUTPUT
+
+  isort:
+    needs: variables
+    # if PR is external, trigger the tests on push or new PR
+    if: ${{ needs.variables.outputs.LOCAL_PR == 'false'}}
+    uses: ./.github/workflows/isort.yml
+  black:
+    needs: variables
+    if: ${{ needs.variables.outputs.LOCAL_PR == 'false' }}
+    uses: ./.github/workflows/black.yml
+  build:
+    needs: variables
+    if: ${{ needs.variables.outputs.LOCAL_PR == 'false' }}
+    uses: ./.github/workflows/build.yml
+  docs:
+    needs: variables
+    if: ${{ needs.variables.outputs.LOCAL_PR == 'false' }}
+    uses: ./.github/workflows/docs.yml
\ No newline at end of file
diff --git a/.github/workflows/isort.yml b/.github/workflows/isort.yml
index bc5c277..c2cf8b5 100644
--- a/.github/workflows/isort.yml
+++ b/.github/workflows/isort.yml
@@ -17,4 +17,4 @@ jobs:
           sudo apt install openmpi-bin libopenmpi-dev
       # Install dependencies for proper 1st/2nd/3rd party import sorting
       - run: pip install -e .[parallel]
-      - uses: isort/isort-action@master
\ No newline at end of file
+      - uses: isort/isort-action@v1.1.0
\ No newline at end of file
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 7c9c3d0..5bbc4da 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -14,11 +14,9 @@ jobs:
     uses: ./.github/workflows/build.yml
   docs:
     uses: ./.github/workflows/docs.yml
-  api:
-    uses: ./.github/workflows/api.yml
 
   tag_release:
-    needs: [isort, black, build, docs, api]
+    needs: [isort, black, build, docs]
     runs-on: ubuntu-latest
     outputs:
       tag: ${{ steps.semver.outputs.next }}
diff --git a/.github/workflows/pull_request.yml b/.github/workflows/pull_request.yml
index 9ab7c76..2d3e58c 100644
--- a/.github/workflows/pull_request.yml
+++ b/.github/workflows/pull_request.yml
@@ -1,32 +1,16 @@
-name: Validate Pull Request
+name: Validate Pull Request Name
 
 on:
   pull_request:
-    types: [opened, synchronize, reopened, edited]
+    types: [edited, opened, reopened]
 
 jobs:
   validate-pr-title:
+    # Trigger only for local PR when PR is edited (title, description, etc.)
+    if: ${{ github.event.pull_request.head.repo.full_name == github.repository }}
     runs-on: ubuntu-latest
     steps:
       - name: PR Conventional Commit Validation
         uses:  ytanikin/PRConventionalCommits@1.2.0
         with:
           task_types: '["feat","fix","docs","test","ci","refactor","perf","revert"]'
-
-  preview-docs:
-    runs-on: ubuntu-latest
-    if: github.event.action != 'edited'
-    steps:
-      - uses: actions/checkout@v4
-      - name: Check modifications on docs
-        uses: dorny/paths-filter@v3
-        id: filter
-        with:
-          filters: |
-            docs:  # name of the filter
-              - 'docs/**'
-      - name: Preview Readthedocs
-        if: steps.filter.outputs.docs == 'true'
-        uses: readthedocs/actions/preview@v1
-        with:
-          project-slug: "bsb"