diff --git a/docs/hygiene-history/ticks/2026/05/18/2315Z-c.md b/docs/hygiene-history/ticks/2026/05/18/2315Z-c.md
new file mode 100644
index 0000000000..e0a62114a5
--- /dev/null
+++ b/docs/hygiene-history/ticks/2026/05/18/2315Z-c.md
@@ -0,0 +1,20 @@
+| 2026-05-18T23:15Z | opus-4-7 / autonomous-loop | de1e7f5d | brief-ack #1 named-dep #4245 CI wait; #4244 merged; threads clean | -- | quiet |
+
+# Tick 2315Z-c — 2026-05-18
+
+## Refresh + thread-investigation
+
+- graphql 3757; main `715ad59`
+- #4244 MERGED; #4245 OPEN CI; threads 0 across all open
+
+## Counter
+
+Brief-ack #1 named-dep #4245 CI wait. Counter reset by last tick's FP-resolution.
+
+## CronList
+
+de1e7f5d alive.
+
+## Visibility-stop
+
+End of tick.