diff --git a/slab/menubar-swift/Sources/SlabMenubar/ClaudeSession.swift b/slab/menubar-swift/Sources/SlabMenubar/ClaudeSession.swift
index 669933661a..26cdd08390 100644
--- a/slab/menubar-swift/Sources/SlabMenubar/ClaudeSession.swift
+++ b/slab/menubar-swift/Sources/SlabMenubar/ClaudeSession.swift
@@ -105,6 +105,12 @@ struct ClaudeSession {
     /// The prompt rock turns this into a QR surface; everything else ignores it.
     var scanURL: String = ""
 
+    /// The piece this session is writing, with its extension — `balozo.mjs`.
+    /// Only Aesthetic Code sets it, and it names the rock: a session that is
+    /// holding a piece should be addressable by that piece's name rather than
+    /// by a second unrelated word drawn from its session id.
+    var piece: String = ""
+
     /// Native provider thread id. Claude uses `sessionId`; Codex's tracked
     /// wrapper has its own rock id, so the watcher records the rollout id here.
     var providerSessionId: String = ""
@@ -371,6 +377,7 @@ enum ClaudeSessionReader {
         session.loopboyResponse = (obj["loopboy_response"] as? String) ?? ""
         session.nudgeScreen = (obj["nudge_screen"] as? String) ?? ""
         session.scanURL = (obj["scan_url"] as? String) ?? ""
+        session.piece = (obj["piece"] as? String) ?? ""
         return session
     }
 
diff --git a/slab/menubar-swift/Sources/SlabMenubar/SigilRenderer.swift b/slab/menubar-swift/Sources/SlabMenubar/SigilRenderer.swift
index 40462f769c..80ef4ad44b 100644
--- a/slab/menubar-swift/Sources/SlabMenubar/SigilRenderer.swift
+++ b/slab/menubar-swift/Sources/SlabMenubar/SigilRenderer.swift
@@ -70,6 +70,17 @@ enum SigilRenderer {
                 return routeName
             }
         }
+        // An Aesthetic Code session is holding one named piece, and that name is
+        // already the session's public identity: it is the slug in the address on
+        // the rock and the channel the piece is pushed on. Drawing a second,
+        // unrelated word from the session id meant the rock and the piece
+        // disagreed about what the session was called — you would open `balozo`
+        // and be handed `muzad`. The piece wins, and follows a rename.
+        if session.agentType == "aesthetic-code" {
+            let slug = (session.piece as NSString).deletingPathExtension
+            let clean = slug.filter { $0.isLetter || $0.isNumber || $0 == "-" || $0 == "_" }
+            if !clean.isEmpty { return String(clean.prefix(16)) }
+        }
         return name(forSessionId: session.sessionId)
     }