diff --git a/docs/adr/ADR-028-work-claims-and-decision-ledger.md b/docs/adr/ADR-028-work-claims-and-decision-ledger.md
index 96b602e64..8a93db0de 100644
--- a/docs/adr/ADR-028-work-claims-and-decision-ledger.md
+++ b/docs/adr/ADR-028-work-claims-and-decision-ledger.md
@@ -94,10 +94,12 @@ This fleet has produced the evidence unprompted, in the repo, this week:
   surface #1234 had had open since 2026-08-25. Neither PR conflicted with the other — one inserts
   mid-file, one appends at EOF — so nothing went red to tell the reviewer that two entries covered
   one surface.
-- **`main` has carried two files named `ADR-018` for 22 days.** `ADR-018-agent-identity.md` (merged
+- **`main` carried two files named `ADR-018` for 22 days.** `ADR-018-agent-identity.md` (merged
   2026-08-04) and `ADR-018-agent-attention-claims.md` (merged 2026-08-11). Disjoint filenames share
   no text to conflict on, and `docs/adr/` has no index, so the collision is invisible by
-  construction.
+  construction. The stub is renumbered to ADR-030 in the same change that carries this sentence; the
+  finding stands, because nothing detected the collision for 22 days and a third instance (ADR-025)
+  arrived before it was resolved.
 - **A conflict resolution was silently discarded, twice in one hour.** #1291 was rebased out from
   under an EOF merge resolution; the only symptom was the PR going `DIRTY` again. Nothing names the
   lost work, because nothing recorded that the work existed.
diff --git a/docs/adr/ADR-018-agent-identity.md b/docs/adr/ADR-030-agent-identity.md
similarity index 92%
rename from docs/adr/ADR-018-agent-identity.md
rename to docs/adr/ADR-030-agent-identity.md
index 686a290f2..f04d67597 100644
--- a/docs/adr/ADR-018-agent-identity.md
+++ b/docs/adr/ADR-030-agent-identity.md
@@ -1,7 +1,11 @@
-# ADR-018 — Agent identity
+# ADR-030 — Agent identity
 
 **Status:** Proposed (stub — decision not yet made)
 **Date opened:** 2026-08-01
+**Renumbered:** 2026-09-01, from ADR-018. `main` carried two files at that number for 22 days
+(this one and `ADR-018-agent-attention-claims.md`, Accepted 2026-08-17). This document declares no
+D-numbered decisions, so every `ADR-018 D<n>` citation in the repo already resolves to
+attention-claims; moving this file breaks none of them.
 
 ## Why this is open