From 2a84e6d89b954b446bb49e11ecb89aa6e3f45493 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=8E=8B=E5=BE=B7=E5=AE=87?= <kvtodev@outlook.com>
Date: Thu, 16 Jul 2026 15:45:19 +0800
Subject: [PATCH] limit llm message sliding window size

---
 server-rs/crates/api-server/src/editor_agent/api.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/server-rs/crates/api-server/src/editor_agent/api.rs b/server-rs/crates/api-server/src/editor_agent/api.rs
index 3b1c69635..1a026cca7 100644
--- a/server-rs/crates/api-server/src/editor_agent/api.rs
+++ b/server-rs/crates/api-server/src/editor_agent/api.rs
@@ -135,6 +135,10 @@ pub async fn editor_agent_message(
             EditorAgentMessageRole::Assistant => LlmMessage::assistant(&msg.text),
             EditorAgentMessageRole::System => LlmMessage::system(&msg.text),
         })
+        // limit to last 18 messages (larger considering attachment, tool calls are injected as system messages)
+        .rev()
+        .take(18)
+        .rev()
         .collect();
 
     // Save user message to document.