From 94835a5f1dc7b2fbdb78efe74f06fd57f604c704 Mon Sep 17 00:00:00 2001
From: kevin <kevin@lmve.net>
Date: Sat, 20 Jun 2026 00:53:21 +0800
Subject: [PATCH] =?UTF-8?q?fix(llm):=20=E5=90=AF=E7=94=A8=E5=B7=A5?=
 =?UTF-8?q?=E5=85=B7=E6=97=B6=E6=9C=80=E7=BB=88=E5=9B=9E=E5=A4=8D=E6=94=B9?=
 =?UTF-8?q?=E7=94=A8=E4=B8=BB=E5=9B=9E=E5=A4=8D=E9=85=8D=E7=BD=AE=E7=9A=84?=
 =?UTF-8?q?=20system=20prompt?=
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此前工具循环把工具路由 prompt 同时塞进最终回复和路由决策，导致用户在
「主 AI 回复配置」编辑的系统提示词被工具路由 prompt 覆盖、未加载到回复。
现在 finalMessages 用主回复 prompt，decisionMessages 用工具路由 prompt。

Co-Authored-By: Claude <noreply@anthropic.com>
---
 internal/toolrouter/loop.go | 29 ++++++++++++++++++++---------
 1 file changed, 20 insertions(+), 9 deletions(-)

diff --git a/internal/toolrouter/loop.go b/internal/toolrouter/loop.go
index e3bf03f..35b24e6 100644
--- a/internal/toolrouter/loop.go
+++ b/internal/toolrouter/loop.go
@@ -76,20 +76,31 @@ func RunAgentToolLoop(ctx context.Context, state *State, profile *llm.Profile, s
 	}
 	// 每轮调用都重新加载最新配置，确保管理员在 /admin/llm/api 保存后立即生效
 	cfg := state.effectiveConfig()
-	// Use tool router system prompt if available, otherwise fall back to primary system prompt
-	prompt := strings.TrimSpace(cfg.SystemPrompt)
-	if prompt == "" {
-		prompt = strings.TrimSpace(systemPrompt)
+	// 最终回复使用主回复配置的 system prompt（机器人人设/回复指引）；
+	// 工具路由决策使用工具路由的 system prompt（指导如何调用工具），
+	// 为空时回退到主回复 prompt。两者分离，避免工具路由 prompt 覆盖主回复 prompt。
+	primaryPrompt := strings.TrimSpace(systemPrompt)
+	routerPrompt := strings.TrimSpace(cfg.SystemPrompt)
+	if routerPrompt == "" {
+		routerPrompt = primaryPrompt
 	}
-	if prompt != "" {
-		systemMessage := &model.ChatCompletionMessage{
+	if primaryPrompt != "" {
+		primarySystemMessage := &model.ChatCompletionMessage{
 			Role: "system",
 			Content: &model.ChatCompletionMessageContent{
-				StringValue: &prompt,
+				StringValue: &primaryPrompt,
 			},
 		}
-		finalMessages = append([]*model.ChatCompletionMessage{systemMessage}, finalMessages...)
-		decisionMessages = append([]*model.ChatCompletionMessage{systemMessage}, decisionMessages...)
+		finalMessages = append([]*model.ChatCompletionMessage{primarySystemMessage}, finalMessages...)
+	}
+	if routerPrompt != "" {
+		routerSystemMessage := &model.ChatCompletionMessage{
+			Role: "system",
+			Content: &model.ChatCompletionMessageContent{
+				StringValue: &routerPrompt,
+			},
+		}
+		decisionMessages = append([]*model.ChatCompletionMessage{routerSystemMessage}, decisionMessages...)
 	}
 	for i := 0; i < maxAgentToolIterations; i++ {
 		if emit != nil {