diff --git a/.github/workflows/backport.yml b/.github/workflows/backport.yml
index 0c8548d05deb..aee4258f7bb7 100644
--- a/.github/workflows/backport.yml
+++ b/.github/workflows/backport.yml
@@ -14,7 +14,7 @@ permissions: {}
 jobs:
   backport:
     name: Backport Pull Request
-    if: github.repository_owner == 'NixOS' && github.event.pull_request.merged == true && (github.event.action != 'labeled' || startsWith(github.event.label.name, 'backport'))
+    if: vars.NIXPKGS_CI_APP_ID && github.event.pull_request.merged == true && (github.event.action != 'labeled' || startsWith(github.event.label.name, 'backport'))
     runs-on: ubuntu-24.04-arm
     steps:
       # Use a GitHub App to create the PR so that CI gets triggered
diff --git a/.github/workflows/check-cherry-picks.yml b/.github/workflows/check-cherry-picks.yml
index f74c83cb6ddf..70dfdfba1e5f 100644
--- a/.github/workflows/check-cherry-picks.yml
+++ b/.github/workflows/check-cherry-picks.yml
@@ -1,6 +1,9 @@
 name: "Check cherry-picks"
 
 on:
+  pull_request:
+    paths:
+      - .github/workflows/check-cherry-picks.yml
   pull_request_target:
     branches:
       - 'release-**'
@@ -13,7 +16,6 @@ jobs:
   check:
     name: cherry-pick-check
     runs-on: ubuntu-24.04-arm
-    if: github.repository_owner == 'NixOS'
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
diff --git a/.github/workflows/check-format.yml b/.github/workflows/check-format.yml
index caa6db054e15..01312cd8f170 100644
--- a/.github/workflows/check-format.yml
+++ b/.github/workflows/check-format.yml
@@ -1,6 +1,9 @@
 name: Check that files are formatted
 
 on:
+  pull_request:
+    paths:
+      - .github/workflows/check-format.yml
   pull_request_target:
     types: [opened, synchronize, reopened, edited]
 
diff --git a/.github/workflows/check-shell.yml b/.github/workflows/check-shell.yml
index c8ecf553f107..c26bea7761bc 100644
--- a/.github/workflows/check-shell.yml
+++ b/.github/workflows/check-shell.yml
@@ -1,6 +1,9 @@
 name: "Check shell"
 
 on:
+  pull_request:
+    paths:
+      - .github/workflows/check-shell.yml
   pull_request_target:
     paths:
       - 'shell.nix'
diff --git a/.github/workflows/codeowners-v2.yml b/.github/workflows/codeowners-v2.yml
index 3c0e49afb5c7..28b0ef43d5ac 100644
--- a/.github/workflows/codeowners-v2.yml
+++ b/.github/workflows/codeowners-v2.yml
@@ -23,6 +23,9 @@
 name: Codeowners v2
 
 on:
+  pull_request:
+    paths:
+      - .github/workflows/codeowners-v2.yml
   pull_request_target:
     types: [opened, ready_for_review, synchronize, reopened, edited]
 
@@ -64,6 +67,7 @@ jobs:
         run: nix-build base/ci -A codeownersValidator
 
       - uses: actions/create-github-app-token@df432ceedc7162793a195dd1713ff69aefc7379e # v2.0.6
+        if: vars.OWNER_RO_APP_ID
         id: app-token
         with:
           app-id: ${{ vars.OWNER_RO_APP_ID }}
@@ -77,6 +81,7 @@ jobs:
           path: pr
 
       - name: Validate codeowners
+        if: steps.app-token.outputs.token
         run: result/bin/codeowners-validator
         env:
           OWNERS_FILE: pr/${{ env.OWNERS_FILE }}
@@ -99,6 +104,7 @@ jobs:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
 
       - uses: actions/create-github-app-token@df432ceedc7162793a195dd1713ff69aefc7379e # v2.0.6
+        if: vars.OWNER_APP_ID
         id: app-token
         with:
           app-id: ${{ vars.OWNER_APP_ID }}
@@ -111,6 +117,7 @@ jobs:
         run: nix-build ci -A requestReviews
 
       - name: Request reviews
+        if: steps.app-token.outputs.token
         run: result/bin/request-code-owner-reviews.sh ${{ github.repository }} ${{ github.event.number }} "$OWNERS_FILE"
         env:
           GH_TOKEN: ${{ steps.app-token.outputs.token }}
diff --git a/.github/workflows/eval-aliases.yml b/.github/workflows/eval-aliases.yml
index 8dfb298c6da8..7f9b658081f1 100644
--- a/.github/workflows/eval-aliases.yml
+++ b/.github/workflows/eval-aliases.yml
@@ -1,6 +1,9 @@
 name: Eval aliases
 
 on:
+  pull_request:
+    paths:
+      - .github/workflows/eval-aliases.yml
   pull_request_target:
 
 permissions: {}
@@ -26,7 +29,7 @@ jobs:
           extra_nix_config: sandbox = true
 
       - name: Ensure flake outputs on all systems still evaluate
-        run: nix --experimental-features 'nix-command flakes' flake check --all-systems --no-build ./nixpkgs
+        run: nix flake check --all-systems --no-build ./nixpkgs
 
       - name: Query nixpkgs with aliases enabled to check for basic syntax errors
         run: |
diff --git a/.github/workflows/eval.yml b/.github/workflows/eval.yml
index 55f58bf9cbac..ce9378e62320 100644
--- a/.github/workflows/eval.yml
+++ b/.github/workflows/eval.yml
@@ -1,6 +1,9 @@
 name: Eval
 
 on:
+  pull_request:
+    paths:
+      - .github/workflows/eval.yml
   pull_request_target:
     types: [opened, ready_for_review, synchronize, reopened]
   push:
@@ -175,6 +178,7 @@ jobs:
       # See ./codeowners-v2.yml, reuse the same App because we need the same permissions
       # Can't use the token received from permissions above, because it can't get enough permissions
       - uses: actions/create-github-app-token@df432ceedc7162793a195dd1713ff69aefc7379e # v2.0.6
+        if: vars.OWNER_APP_ID
         id: app-token
         with:
           app-id: ${{ vars.OWNER_APP_ID }}
@@ -205,6 +209,7 @@ jobs:
         run: nix-build base/ci -A requestReviews
 
       - name: Labelling pull request
+        if: ${{ github.event_name == 'pull_request_target' && github.repository_owner == 'NixOS' }}
         run: |
           # Get all currently set rebuild labels
           gh api \
@@ -239,7 +244,7 @@ jobs:
           NUMBER: ${{ github.event.number }}
 
       - name: Add eval summary to commit statuses
-        if: ${{ github.event_name == 'pull_request_target' }}
+        if: ${{ github.event_name == 'pull_request_target' && github.repository_owner == 'NixOS' }}
         run: |
           description=$(jq -r '
           "Package: added " + (.attrdiff.added | length | tostring) +
@@ -259,6 +264,7 @@ jobs:
           NUMBER: ${{ github.event.number }}
 
       - name: Requesting maintainer reviews
+        if: ${{ steps.app-token.outputs.token && github.repository_owner == 'NixOS' }}
         run: |
           # maintainers.json contains GitHub IDs. Look up handles to request reviews from.
           # There appears to be no API to request reviews based on GitHub IDs
diff --git a/.github/workflows/get-merge-commit.yml b/.github/workflows/get-merge-commit.yml
index d39e2ad3acfc..edbda3e040eb 100644
--- a/.github/workflows/get-merge-commit.yml
+++ b/.github/workflows/get-merge-commit.yml
@@ -1,6 +1,9 @@
 name: Get merge commit
 
 on:
+  pull_request:
+    paths:
+      - .github/workflows/get-merge-commit.yml
   workflow_call:
     outputs:
       mergedSha:
@@ -38,7 +41,7 @@ jobs:
             push)
               echo "mergedSha=${{ github.sha }}" >> "$GITHUB_OUTPUT"
               ;;
-            pull_request_target)
+            pull_request*)
               if commits=$(base/ci/get-merge-commit.sh ${{ github.repository }} ${{ github.event.number }}); then
                 echo -e "Checking the commits:\n$commits"
                 echo "$commits" >> "$GITHUB_OUTPUT"
diff --git a/.github/workflows/lib-tests.yml b/.github/workflows/lib-tests.yml
index 0643f980381b..d55a109aa9f5 100644
--- a/.github/workflows/lib-tests.yml
+++ b/.github/workflows/lib-tests.yml
@@ -1,6 +1,9 @@
 name: "Building Nixpkgs lib-tests"
 
 on:
+  pull_request:
+    paths:
+      - .github/workflows/lib-tests.yml
   pull_request_target:
     paths:
       - 'lib/**'
diff --git a/.github/workflows/manual-nixos-v2.yml b/.github/workflows/manual-nixos-v2.yml
index fd0f91e2e0c7..a8eadf63057e 100644
--- a/.github/workflows/manual-nixos-v2.yml
+++ b/.github/workflows/manual-nixos-v2.yml
@@ -1,6 +1,9 @@
 name: "Build NixOS manual v2"
 
 on:
+  pull_request:
+    paths:
+      - .github/workflows/manual-nixos-v2.yml
   pull_request_target:
     branches:
       - master
@@ -38,7 +41,6 @@ jobs:
           extra_nix_config: sandbox = true
 
       - uses: cachix/cachix-action@0fc020193b5a1fa3ac4575aa3a7d3aa6a35435ad # v16
-        if: github.repository_owner == 'NixOS'
         with:
           # This cache is for the nixpkgs repo checks and should not be trusted or used elsewhere.
           name: nixpkgs-ci
diff --git a/.github/workflows/manual-nixpkgs-v2.yml b/.github/workflows/manual-nixpkgs-v2.yml
index f899ad409d50..f9a5f8aa30b1 100644
--- a/.github/workflows/manual-nixpkgs-v2.yml
+++ b/.github/workflows/manual-nixpkgs-v2.yml
@@ -1,6 +1,9 @@
 name: "Build Nixpkgs manual v2"
 
 on:
+  pull_request:
+    paths:
+      - .github/workflows/manual-nixpkgs-v2.yml
   pull_request_target:
     branches:
       - master
@@ -25,7 +28,6 @@ jobs:
           extra_nix_config: sandbox = true
 
       - uses: cachix/cachix-action@0fc020193b5a1fa3ac4575aa3a7d3aa6a35435ad # v16
-        if: github.repository_owner == 'NixOS'
         with:
           # This cache is for the nixpkgs repo checks and should not be trusted or used elsewhere.
           name: nixpkgs-ci
diff --git a/.github/workflows/nix-parse-v2.yml b/.github/workflows/nix-parse-v2.yml
index aec48b0ac768..4b670331308e 100644
--- a/.github/workflows/nix-parse-v2.yml
+++ b/.github/workflows/nix-parse-v2.yml
@@ -1,6 +1,9 @@
 name: "Check whether nix files are parseable v2"
 
 on:
+  pull_request:
+    paths:
+      - .github/workflows/nix-parse-v2.yml
   pull_request_target:
 
 permissions: {}
diff --git a/.github/workflows/nixpkgs-vet.yml b/.github/workflows/nixpkgs-vet.yml
index 80d6ba0b9aba..b9f9fd2c56f6 100644
--- a/.github/workflows/nixpkgs-vet.yml
+++ b/.github/workflows/nixpkgs-vet.yml
@@ -6,6 +6,9 @@
 name: Vet nixpkgs
 
 on:
+  pull_request:
+    paths:
+      - .github/workflows/nixpkgs-vet.yml
   pull_request_target:
     # This workflow depends on the base branch of the PR, but changing the base branch is not included in the default trigger events, which would be `opened`, `synchronize` or `reopened`.
     # Instead it causes an `edited` event, so we need to add it explicitly here.
diff --git a/.github/workflows/no-channel.yml b/.github/workflows/no-channel.yml
index c5eae3c94e7d..ee305a12d61b 100644
--- a/.github/workflows/no-channel.yml
+++ b/.github/workflows/no-channel.yml
@@ -1,6 +1,9 @@
 name: "No channel PR"
 
 on:
+  pull_request:
+    paths:
+      - .github/workflows/no-channel.yml
   pull_request_target:
     # Re-run should be triggered when the base branch is updated, instead of silently failing
     types: [opened, synchronize, reopened, edited]