diff --git a/TOOLS.md b/TOOLS.md
index 817c785..5a3ed34 100644
--- a/TOOLS.md
+++ b/TOOLS.md
@@ -32,3 +32,9 @@ Auto-injected env vars:
 |---|---|---|
 | `privilegedescalation/agents` | Board | Agent profiles and configuration (this repo) |
 | `privilegedescalation/headlamp-*` | Gandalf | Headlamp plugin repos |
+
+## GitHub Actions Runners
+
+Self-hosted ARC runners are available at the org level. Use `runs-on: runners-privilegedescalation` in workflows.
+
+Runners scale to zero when idle — if no runner pods are visible, they will start automatically when a workflow is triggered.