diff --git a/.gitea/workflows/crosscheck.yml b/.gitea/workflows/crosscheck.yml
new file mode 100644
index 0000000..9ca0641
--- /dev/null
+++ b/.gitea/workflows/crosscheck.yml
@@ -0,0 +1,14 @@
+# Cross-repo consistency (yukart/tool-crosscheck): decisions, topics, doc references,
+# service lists and front matter checked against their source in every yukart repo.
+on:
+  push:
+    branches: [ master ]
+  workflow_dispatch:
+
+jobs:
+  crosscheck:
+    uses: yukart/tool-crosscheck/.gitea/workflows/crosscheck.yml@master
+    with:
+      repo: ${{ github.event.repository.name }}
+      sha: ${{ github.sha }}
+    secrets: inherit
diff --git a/docs/REPOS.md b/docs/REPOS.md
index d83e7b6..0d2fbc6 100644
--- a/docs/REPOS.md
+++ b/docs/REPOS.md
@@ -30,6 +30,7 @@ contracts repo, not copied into each consumer.
 | [svc-vision](gitea:yukart/svc-vision) | Camera: capture and the live view; recording and inference to come |
 | [tool-mapmint](gitea:yukart/tool-mapmint) | Map artifact minting, workstation-side |
 | [tool-mock](gitea:yukart/tool-mock) | Mocks and fixtures — a fake car on a workstation |
+| [tool-crosscheck](gitea:yukart/tool-crosscheck) | Consistency checks across all yukart repos; a reusable workflow every repo runs on push |
 
 ## Planned