diff --git a/plugins/platforms/zulip/adapter.py b/plugins/platforms/zulip/adapter.py
index 99918bd..3878a7d 100644
--- a/plugins/platforms/zulip/adapter.py
+++ b/plugins/platforms/zulip/adapter.py
@@ -853,12 +853,15 @@ class ZulipAdapter(BasePlatformAdapter):
         content: str,
         reply_to: Optional[str] = None,
         metadata: Optional[Dict[str, Any]] = None,
+        **kwargs: Any,
     ) -> SendResult:
         """Send a message to a Zulip chat.
 
         For DMs, chat_id is the user_id. For streams, format is
         "stream_name:topic". Sends a placeholder first if this is the
         first message in a turn, then edits it on subsequent calls.
+
+        Accepts **kwargs for Hermes Gateway compatibility.
         """
         # Determine target type and IDs
         is_dm = not chat_id or ":" not in chat_id
@@ -925,19 +928,42 @@ class ZulipAdapter(BasePlatformAdapter):
         message_id: str,
         content: str,
         metadata: Optional[Dict[str, Any]] = None,
-    ) -> bool:
-        """Edit a previously sent Zulip message (for placeholder replacement)."""
+        **kwargs: Any,
+    ) -> SendResult:
+        """Edit a previously sent Zulip message (for placeholder replacement).
+
+        Returns SendResult for Hermes Gateway streaming interface compatibility.
+        Accepts **kwargs (e.g., finalize=True) — extra kwargs are silently ignored.
+
+        Note: Zulip uses POST /api/v1/messages/{message_id} for editing.
+        """
         truncated = _truncate(content)
         payload = {
-            "message_id": int(message_id),
             "content": truncated,
         }
         try:
-            resp, _ = await self._api_call("PATCH", "/api/v1/messages", data=payload)
-            return resp is not None
+            resp, status = await self._api_call(
+                "POST", f"/api/v1/messages/{int(message_id)}",
+                data=payload,
+            )
+            if resp:
+                self._health_stats["send_count"] += 1
+                return SendResult(
+                    success=True,
+                    message_id=str(resp.get("id", message_id)),
+                )
+            self._health_stats["send_errors"] += 1
+            return SendResult(
+                success=False,
+                error=f"Edit failed (status={status})",
+            )
         except Exception as e:
             logger.warning("[%s] Edit message %s error: %s", self.name, message_id, e)
-            return False
+            self._health_stats["send_errors"] += 1
+            return SendResult(
+                success=False,
+                error=str(e),
+            )
 
     async def send_typing(self, chat_id: str, metadata: Optional[Dict] = None) -> None:
         """Send typing indicator to a Zulip chat."""
@@ -975,12 +1001,14 @@ class ZulipAdapter(BasePlatformAdapter):
         return {"name": chat_id, "type": "dm"}
 
     async def delete_message(
-        self, chat_id: str, message_id: str, metadata: Optional[Dict] = None
-    ) -> bool:
+        self, chat_id: str, message_id: str,
+        metadata: Optional[Dict] = None,
+        **kwargs: Any,
+    ) -> SendResult:
         """Delete a message via Zulip API."""
         # Zulip doesn't support message deletion via API for bots
         # Send an empty edit instead
-        return await self.edit_message(chat_id, message_id, "*deleted*")
+        return await self.edit_message(chat_id, message_id, "*deleted*", **kwargs)
 
     # ------------------------------------------------------------------
     # Gen 2: Self-test diagnostics