Fix: Isolate webchat sessions per agent

interface/src/hooks/useWebChat.ts

@@ -48,7 +48,7 @@ async function consumeSSE(
 }
 
 export function useWebChat(agentId: string) {
-	const sessionId = "portal:chat";
+	const sessionId = `portal:chat:${agentId}`;
 	const [messages, setMessages] = useState<WebChatMessage[]>([]);
 	const [isStreaming, setIsStreaming] = useState(false);
 	const [error, setError] = useState<string | null>(null);

src/config.rs

@@ -600,6 +600,13 @@ impl Binding {
             return false;
         }
 
+        // For webchat messages, match based on agent_id in the message
+        if message.source == "webchat" {
+            if let Some(message_agent_id) = &message.agent_id {
+                return message_agent_id.as_ref() == &self.agent_id;
+            }
+        }
+
         // DM messages have no guild_id — match if the sender is in dm_allowed_users
         let is_dm =
             message.metadata.get("discord_guild_id").is_none() && message.source == "discord";

src/conversation/channels.rs

@@ -217,6 +217,7 @@ fn extract_display_name(
             .get("display_name")
             .and_then(|v| v.as_str())
             .map(|s| s.to_string()),
+        "portal" => Some("portal:chat".to_string()),
         _ => None,
     }
 }