From b85130b8490b0057f9407f95f204e7a6090f7a4b Mon Sep 17 00:00:00 2001
From: Jiahe Wu <117764480+blueberrycongee@users.noreply.github.com>
Date: Wed, 17 Dec 2025 21:04:37 +0800
Subject: [PATCH] fix: display direct_response message in frontend (#763)
 (#764)

Extract message content from direct_response tool call args
and display it as the message content when tool call completes.

Note: This is a workaround. The message is not streamed because
direct_response uses tool calling mechanism where args are JSON,
not natural language text that can be streamed directly.
---
 web/src/core/messages/merge-message.ts | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/web/src/core/messages/merge-message.ts b/web/src/core/messages/merge-message.ts
index 8f1bf3e1d..a47fc7332 100644
--- a/web/src/core/messages/merge-message.ts
+++ b/web/src/core/messages/merge-message.ts
@@ -62,6 +62,11 @@ export function mergeMessage(message: Message, event: ChatEvent) {
           toolCall.args = safeParseToolArgs(toolCall.argsChunks.join(""));
           delete toolCall.argsChunks;
         }
+        // Handle direct_response tool: extract message content for display
+        if (toolCall.name === "direct_response" && toolCall.args?.message) {
+          message.content = toolCall.args.message as string;
+          message.contentChunks = [message.content];
+        }
       });
     }
   }