diff --git a/templates/BHE/ci-alpha.yml b/templates/BHE/ci-alpha.yml
index 67d046d..5fa0060 100644
--- a/templates/BHE/ci-alpha.yml
+++ b/templates/BHE/ci-alpha.yml
@@ -2,7 +2,10 @@
 # omitted (private repos do not enforce OSS copyright); all other jobs mirror
 # the BHoM variant. Copy to .github/workflows/ci-alpha.yml in each BHE alpha
 # repo. Runs on pull_request, non-blocking until a ruleset requires its checks.
-# Workflow name CI keeps check contexts bare: required contexts are the job names.
+# Check contexts are the job names and do not depend on this workflow's name.
+# Keep the name distinct from the required workflow's: the concurrency group is
+# built from the name and is scoped to the repository, so two workflows sharing
+# a name would let their runs cancel each other.
 
 name: CI
 
@@ -12,7 +15,11 @@ on:
       - develop
 
 concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}-${{ github.event_name }}
+  # The literal prefix is the separation. A concurrency group is scoped to the
+  # repository, not to one workflow, so without it this group would collide with
+  # any other workflow that happened to share this one's name. The tier is in the
+  # prefix so two tier files in one repository cannot collide either.
+  group: local-ci-alpha-${{ github.workflow }}-${{ github.ref }}-${{ github.event_name }}
   cancel-in-progress: true
 
 jobs:
diff --git a/templates/BHE/ci-beta.yml b/templates/BHE/ci-beta.yml
index 8e29c3d..5a03820 100644
--- a/templates/BHE/ci-beta.yml
+++ b/templates/BHE/ci-beta.yml
@@ -8,7 +8,10 @@
 # repository-local copy is reduced, so the two definitions must stay identical: a
 # difference between them surfaces as two check runs of the same name disagreeing,
 # which is unreadable on a pull request.
-# Workflow name CI keeps check contexts bare: required contexts are the job names.
+# Check contexts are the job names and do not depend on this workflow's name.
+# Keep the name distinct from the required workflow's: the concurrency group is
+# built from the name and is scoped to the repository, so two workflows sharing
+# a name would let their runs cancel each other.
 
 name: CI
 
@@ -18,7 +21,11 @@ on:
       - develop
 
 concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}-${{ github.event_name }}
+  # The literal prefix is the separation. A concurrency group is scoped to the
+  # repository, not to one workflow, so without it this group would collide with
+  # any other workflow that happened to share this one's name. The tier is in the
+  # prefix so two tier files in one repository cannot collide either.
+  group: local-ci-beta-${{ github.workflow }}-${{ github.ref }}-${{ github.event_name }}
   cancel-in-progress: true
 
 jobs:
diff --git a/templates/BHE/ci-prototype.yml b/templates/BHE/ci-prototype.yml
index cb8d112..3b5adfc 100644
--- a/templates/BHE/ci-prototype.yml
+++ b/templates/BHE/ci-prototype.yml
@@ -3,7 +3,10 @@
 # the BHoM variant. Copy to .github/workflows/ci-prototype.yml in each BHE
 # prototype repo. Runs on pull_request, non-blocking until a ruleset requires
 # its checks.
-# Workflow name CI keeps check contexts bare: required contexts are the job names.
+# Check contexts are the job names and do not depend on this workflow's name.
+# Keep the name distinct from the required workflow's: the concurrency group is
+# built from the name and is scoped to the repository, so two workflows sharing
+# a name would let their runs cancel each other.
 
 name: CI
 
@@ -13,7 +16,11 @@ on:
       - develop
 
 concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}-${{ github.event_name }}
+  # The literal prefix is the separation. A concurrency group is scoped to the
+  # repository, not to one workflow, so without it this group would collide with
+  # any other workflow that happened to share this one's name. The tier is in the
+  # prefix so two tier files in one repository cannot collide either.
+  group: local-ci-prototype-${{ github.workflow }}-${{ github.ref }}-${{ github.event_name }}
   cancel-in-progress: true
 
 jobs:
diff --git a/templates/BHoM/ci-alpha.yml b/templates/BHoM/ci-alpha.yml
index 6c33c48..46d585d 100644
--- a/templates/BHoM/ci-alpha.yml
+++ b/templates/BHoM/ci-alpha.yml
@@ -2,7 +2,10 @@
 # copyright-compliance (BHoM enforces OSS copyright; the BHE variant omits it).
 # Copy to .github/workflows/ci-alpha.yml in each BHoM alpha repo.
 # Runs on pull_request, non-blocking until a ruleset requires its checks.
-# Workflow name CI keeps check contexts bare: required contexts are the job names.
+# Check contexts are the job names and do not depend on this workflow's name.
+# Keep the name distinct from the required workflow's: the concurrency group is
+# built from the name and is scoped to the repository, so two workflows sharing
+# a name would let their runs cancel each other.
 
 name: CI
 
@@ -12,7 +15,11 @@ on:
       - develop
 
 concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}-${{ github.event_name }}
+  # The literal prefix is the separation. A concurrency group is scoped to the
+  # repository, not to one workflow, so without it this group would collide with
+  # any other workflow that happened to share this one's name. The tier is in the
+  # prefix so two tier files in one repository cannot collide either.
+  group: local-ci-alpha-${{ github.workflow }}-${{ github.ref }}-${{ github.event_name }}
   cancel-in-progress: true
 
 jobs:
diff --git a/templates/BHoM/ci-beta.yml b/templates/BHoM/ci-beta.yml
index f811539..5683156 100644
--- a/templates/BHoM/ci-beta.yml
+++ b/templates/BHoM/ci-beta.yml
@@ -2,7 +2,10 @@
 # copyright-compliance (BHoM enforces OSS copyright; the BHE variant omits it).
 # Copy to .github/workflows/ci-beta.yml in each BHoM beta repo.
 # Runs on pull_request, non-blocking until a ruleset requires its checks.
-# Workflow name CI keeps check contexts bare: required contexts are the job names.
+# Check contexts are the job names and do not depend on this workflow's name.
+# Keep the name distinct from the required workflow's: the concurrency group is
+# built from the name and is scoped to the repository, so two workflows sharing
+# a name would let their runs cancel each other.
 
 name: CI
 
@@ -12,7 +15,11 @@ on:
       - develop
 
 concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}-${{ github.event_name }}
+  # The literal prefix is the separation. A concurrency group is scoped to the
+  # repository, not to one workflow, so without it this group would collide with
+  # any other workflow that happened to share this one's name. The tier is in the
+  # prefix so two tier files in one repository cannot collide either.
+  group: local-ci-beta-${{ github.workflow }}-${{ github.ref }}-${{ github.event_name }}
   cancel-in-progress: true
 
 jobs:
diff --git a/templates/BHoM/ci-prototype.yml b/templates/BHoM/ci-prototype.yml
index 34498fa..99e5df4 100644
--- a/templates/BHoM/ci-prototype.yml
+++ b/templates/BHoM/ci-prototype.yml
@@ -2,7 +2,10 @@
 # copyright-compliance (BHoM enforces OSS copyright; the BHE variant omits it).
 # Copy to .github/workflows/ci-prototype.yml in each BHoM prototype repo.
 # Runs on pull_request, non-blocking until a ruleset requires its checks.
-# Workflow name CI keeps check contexts bare: required contexts are the job names.
+# Check contexts are the job names and do not depend on this workflow's name.
+# Keep the name distinct from the required workflow's: the concurrency group is
+# built from the name and is scoped to the repository, so two workflows sharing
+# a name would let their runs cancel each other.
 
 name: CI
 
@@ -12,7 +15,11 @@ on:
       - develop
 
 concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}-${{ github.event_name }}
+  # The literal prefix is the separation. A concurrency group is scoped to the
+  # repository, not to one workflow, so without it this group would collide with
+  # any other workflow that happened to share this one's name. The tier is in the
+  # prefix so two tier files in one repository cannot collide either.
+  group: local-ci-prototype-${{ github.workflow }}-${{ github.ref }}-${{ github.event_name }}
   cancel-in-progress: true
 
 jobs:
diff --git a/templates/ci-format.yml b/templates/ci-format.yml
index 6fed4ad..7fb0fdb 100644
--- a/templates/ci-format.yml
+++ b/templates/ci-format.yml
@@ -4,7 +4,10 @@
 #
 # Rulesets ignore event filters on required workflows, so this file has
 # no paths filter. The composite self-skips when no relevant files have changed.
-# Workflow name CI keeps check contexts bare: required contexts are the job names.
+# Check contexts are the job names and do not depend on this workflow's name.
+# Keep the name distinct from the required workflow's: the concurrency group is
+# built from the name and is scoped to the repository, so two workflows sharing
+# a name would let their runs cancel each other.
 
 name: CI
 
@@ -12,7 +15,11 @@ on:
   pull_request:
 
 concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}-${{ github.event_name }}
+  # The literal prefix is the separation. A concurrency group is scoped to the
+  # repository, not to one workflow, so without it this group would collide with
+  # any other workflow that happened to share this one's name. This file is a
+  # required-workflow source, so its prefix matches the other required workflows'.
+  group: required-ci-format-${{ github.workflow }}-${{ github.ref }}-${{ github.event_name }}
   cancel-in-progress: true
 
 jobs:
diff --git a/templates/ci-unit-tests.yml b/templates/ci-unit-tests.yml
index 526e9f8..16b90cb 100644
--- a/templates/ci-unit-tests.yml
+++ b/templates/ci-unit-tests.yml
@@ -8,7 +8,10 @@
 # Extending orgs: override test_toolkit_repo via with: to point at a fork.
 # Dep forks must carry the relevant changes on the PR's base branch,
 # not the fork's default branch, since resolve-dependencies clones from the base.
-# Workflow name CI keeps check contexts bare: required contexts are the job names.
+# Check contexts are the job names and do not depend on this workflow's name.
+# Keep the name distinct from the required workflow's: the concurrency group is
+# built from the name and is scoped to the repository, so two workflows sharing
+# a name would let their runs cancel each other.
 
 name: CI
 
@@ -16,7 +19,11 @@ on:
   pull_request:
 
 concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}-${{ github.event_name }}
+  # The literal prefix is the separation. A concurrency group is scoped to the
+  # repository, not to one workflow, so without it this group would collide with
+  # any other workflow that happened to share this one's name. This file is a
+  # required-workflow source, so its prefix matches the other required workflows'.
+  group: required-ci-unit-tests-${{ github.workflow }}-${{ github.ref }}-${{ github.event_name }}
   cancel-in-progress: true
 
 jobs: