diff --git a/bridged/src/main/java/dev/ltms/bridged/member/OpenCodeLauncher.java b/bridged/src/main/java/dev/ltms/bridged/member/OpenCodeLauncher.java
index b830672..8eb300e 100644
--- a/bridged/src/main/java/dev/ltms/bridged/member/OpenCodeLauncher.java
+++ b/bridged/src/main/java/dev/ltms/bridged/member/OpenCodeLauncher.java
@@ -7,6 +7,7 @@ import dev.ltms.bridged.herdr.Agent;
 import dev.ltms.bridged.herdr.AgentControl;
 import dev.ltms.bridged.herdr.WorkspaceControl;
 import dev.ltms.bridged.peer.Capability;
+import dev.ltms.bridged.peer.CharterReceipt;
 import dev.ltms.bridged.peer.PeerHandle;
 import dev.ltms.bridged.peer.SpawnRequest;
 
@@ -406,6 +407,11 @@ public final class OpenCodeLauncher extends HerdrPeerLauncher {
             // appeared).
             return discovery.sessionIdForDirectory(cwd);
         }
+
+        @Override
+        public CharterReceipt charterReceipt() {
+            return delegate.charterReceipt();
+        }
     }
 
     // --- Agent-returning convenience spawns (used by callers/tests that want the herdr Agent) ---
diff --git a/bridged/src/main/java/dev/ltms/bridged/peer/PeerHandle.java b/bridged/src/main/java/dev/ltms/bridged/peer/PeerHandle.java
index 9c80c5e..8d4827c 100644
--- a/bridged/src/main/java/dev/ltms/bridged/peer/PeerHandle.java
+++ b/bridged/src/main/java/dev/ltms/bridged/peer/PeerHandle.java
@@ -74,9 +74,11 @@ public interface PeerHandle {
      * adapter, or a launcher before this field); the session registry stores it so the spawn result
      * and the roster row can show an operator which charter a member actually got.
      *
+     * <p>Deliberately not a {@code default}: a decorator that forgets to override this silently
+     * answers {@code null} for a question it has no basis to answer, and the gap surfaces only as
+     * a missing roster field, not a compile error. Every implementation must answer explicitly.
+     *
      * @return the fingerprint, or {@code null} when the launcher carries none
      */
-    default CharterReceipt charterReceipt() {
-        return null;
-    }
+    CharterReceipt charterReceipt();
 }
diff --git a/bridged/src/test/java/dev/ltms/bridged/member/CompositePeerLauncherTest.java b/bridged/src/test/java/dev/ltms/bridged/member/CompositePeerLauncherTest.java
index f73ccf8..b1f1994 100644
--- a/bridged/src/test/java/dev/ltms/bridged/member/CompositePeerLauncherTest.java
+++ b/bridged/src/test/java/dev/ltms/bridged/member/CompositePeerLauncherTest.java
@@ -10,6 +10,7 @@ import dev.ltms.bridged.herdr.AgentControl;
 import dev.ltms.bridged.herdr.FakeHerdr;
 import dev.ltms.bridged.herdr.WorkspaceControl;
 import dev.ltms.bridged.peer.Capability;
+import dev.ltms.bridged.peer.CharterReceipt;
 import dev.ltms.bridged.peer.MemberRole;
 import dev.ltms.bridged.peer.PeerHandle;
 import dev.ltms.bridged.peer.PeerLauncher;
@@ -93,6 +94,7 @@ class CompositePeerLauncherTest {
                 @Override public String id() { return "pane-" + p; }
                 @Override public String terminalId() { return "term-" + p; }
                 @Override public String profile() { return p; }
+                @Override public CharterReceipt charterReceipt() { return null; }
             };
         }
 
diff --git a/bridged/src/test/java/dev/ltms/bridged/member/OpenCodeLauncherTest.java b/bridged/src/test/java/dev/ltms/bridged/member/OpenCodeLauncherTest.java
index b4dee40..5c1600e 100644
--- a/bridged/src/test/java/dev/ltms/bridged/member/OpenCodeLauncherTest.java
+++ b/bridged/src/test/java/dev/ltms/bridged/member/OpenCodeLauncherTest.java
@@ -7,6 +7,7 @@ import dev.ltms.bridged.herdr.AgentControl;
 import dev.ltms.bridged.herdr.FakeHerdr;
 import dev.ltms.bridged.herdr.WorkspaceControl;
 import dev.ltms.bridged.peer.Capability;
+import dev.ltms.bridged.peer.CharterReceipt;
 import dev.ltms.bridged.peer.PeerHandle;
 import dev.ltms.bridged.peer.PeerUnreachableException;
 import dev.ltms.bridged.peer.SpawnRequest;
@@ -322,6 +323,26 @@ class OpenCodeLauncherTest {
         assertFalse(herdr.called("agent.get"), "no polling when the gate is disabled");
     }
 
+    @Test
+    void handleCarriesTheRealCharterReceiptNotTheInterfaceDefault(@TempDir Path root) {
+        // The base's WorkerHandle computes a real CharterReceipt (CB-571), but the opencode adapter
+        // wraps it in SessionAwareHandle for lazy session discovery. Before this fix that decorator
+        // did not override charterReceipt(), so it silently inherited PeerHandle's `null` default
+        // and the real receipt sitting on its delegate was lost.
+        FakeHerdr herdr = new FakeHerdr();
+        BridgedConfig.Fleet fleet = new BridgedConfig.Fleet(Map.of(), Map.of(), Map.of(), Map.of(),
+                Map.of("dev", "role rule"), null);
+        PeerHandle handle = service(herdr, root,
+                opencodeCfg("google/gemini-2.5-pro", "http://127.0.0.1:8765/mcp", null), () -> fleet)
+                .spawn(new SpawnRequest(null, null, null));
+
+        assertNotNull(handle.charterReceipt(),
+                "an opencode spawn's charterReceipt() must not silently be null");
+        String composed = "role rule\n\n" + HerdrPeerLauncher.REPLY_CHARTER;
+        assertEquals(CharterReceipt.digestOf(composed), handle.charterReceipt().charterSha256(),
+                "the receipt on the wrapped handle must match the exact composed charter bytes");
+    }
+
     // --- CB-508: pinned OpenAI-compatible endpoint (e.g. a local vLLM) ---------------------------
 
     /** A profile with a baseUrl but no model provider prefix cannot be resolved — fail loudly. */