From 3d32aad4cc5ed018936ea60f7b715c28b61bbcd7 Mon Sep 17 00:00:00 2001
From: saschabuehrle <sascha.buehrle@gmail.com>
Date: Sat, 21 Mar 2026 15:53:09 +0100
Subject: [PATCH] fix(discord): recover existing thread on 160004 error (fixes
 #279)

---
 packages/adapter-discord/src/index.ts | 44 ++++++++++++++++++---------
 1 file changed, 30 insertions(+), 14 deletions(-)

diff --git a/packages/adapter-discord/src/index.ts b/packages/adapter-discord/src/index.ts
index 1b6f84a4..ec1c3873 100644
--- a/packages/adapter-discord/src/index.ts
+++ b/packages/adapter-discord/src/index.ts
@@ -959,23 +959,39 @@ export class DiscordAdapter implements Adapter<DiscordThreadId, unknown> {
       threadName,
     });
 
-    const response = await this.discordFetch(
-      `/channels/${channelId}/messages/${messageId}/threads`,
-      "POST",
-      {
-        name: threadName,
-        auto_archive_duration: 1440, // 24 hours
-      }
-    );
+    try {
+      const response = await this.discordFetch(
+        `/channels/${channelId}/messages/${messageId}/threads`,
+        "POST",
+        {
+          name: threadName,
+          auto_archive_duration: 1440, // 24 hours
+        }
+      );
 
-    const result = (await response.json()) as { id: string; name: string };
+      const result = (await response.json()) as { id: string; name: string };
 
-    this.logger.debug("Discord API: POST thread response", {
-      threadId: result.id,
-      threadName: result.name,
-    });
+      this.logger.debug("Discord API: POST thread response", {
+        threadId: result.id,
+        threadName: result.name,
+      });
 
-    return result;
+      return result;
+    } catch (error) {
+      // Discord error 160004: "A thread has already been created for this message"
+      // Recover by using the existing thread (its ID equals the parent message ID).
+      if (
+        error instanceof NetworkError &&
+        error.message.includes("160004")
+      ) {
+        this.logger.debug(
+          "Thread already exists for message, reusing existing thread",
+          { channelId, messageId }
+        );
+        return { id: messageId, name: threadName };
+      }
+      throw error;
+    }
   }
 
   /**