diff --git a/dist/whispergate/index.ts b/dist/whispergate/index.ts
index a4b507d..d48243b 100644
--- a/dist/whispergate/index.ts
+++ b/dist/whispergate/index.ts
@@ -932,9 +932,17 @@ export default {
         }
 
         // Extract content from event.message (AgentMessage)
+        // IMPORTANT: Only process assistant messages — before_message_write fires for both
+        // user (incoming) and assistant (outgoing) messages. Processing user messages would
+        // incorrectly detect end symbols from OTHER agents' messages and advance the turn.
         let content = "";
         const msg = (event as Record<string, unknown>).message as Record<string, unknown> | undefined;
         if (msg) {
+          const role = msg.role as string | undefined;
+          if (role && role !== "assistant") {
+            // Skip non-assistant messages (user messages, system messages, etc.)
+            return;
+          }
           // AgentMessage may have content as string or nested
           if (typeof msg.content === "string") {
             content = msg.content;
diff --git a/plugin/index.ts b/plugin/index.ts
index a4b507d..d48243b 100644
--- a/plugin/index.ts
+++ b/plugin/index.ts
@@ -932,9 +932,17 @@ export default {
         }
 
         // Extract content from event.message (AgentMessage)
+        // IMPORTANT: Only process assistant messages — before_message_write fires for both
+        // user (incoming) and assistant (outgoing) messages. Processing user messages would
+        // incorrectly detect end symbols from OTHER agents' messages and advance the turn.
         let content = "";
         const msg = (event as Record<string, unknown>).message as Record<string, unknown> | undefined;
         if (msg) {
+          const role = msg.role as string | undefined;
+          if (role && role !== "assistant") {
+            // Skip non-assistant messages (user messages, system messages, etc.)
+            return;
+          }
           // AgentMessage may have content as string or nested
           if (typeof msg.content === "string") {
             content = msg.content;