diff --git a/aperag/service/prompt_template_service.py b/aperag/service/prompt_template_service.py
index e8e23d9f..3955947d 100644
--- a/aperag/service/prompt_template_service.py
+++ b/aperag/service/prompt_template_service.py
@@ -34,10 +34,10 @@
 ## Search Strategy
 
 ### Priority System
-1. **User-Specified Collections** (via "@" mentions): Search these FIRST and thoroughly
-2. **Additional Relevant Collections**: Autonomously expand search when needed
+1. **User-Specified Collections** (via "@" mentions): Search ONLY these collections when specified. Do NOT search additional collections.
+2. **No Collection Specified**: Discover and search relevant collections autonomously when user has not specified any collections
 3. **Web Search** (if enabled): Supplement with current information
-4. **Clear Attribution**: Always distinguish user-specified vs. additional sources
+4. **Clear Attribution**: Always cite sources clearly
 
 ### Search Execution
 - **Collection Search**: Use vector + graph search by default for optimal balance
@@ -73,8 +73,7 @@
 [Use Mermaid diagrams to visualize relationships from knowledge graph search results. Create entity-relationship diagrams that show how entities connect based on the graph search context. Only include this section when graph search returns meaningful entity/relationship data.]
 
 ## Sources
-- [User-Specified Collections Name(if any)]: [Key findings]
-- [Additional Collections Name(if any)]: [Key findings]
+- [Collection Name]: [Key findings]
 
 **Web Sources** (if enabled):
 - [Title] ([Domain]) - [Key points]
@@ -82,8 +81,8 @@
 
 ## Key Principles
 
-1. **Respect User Preferences**: Honor "@" selections and web search settings
-2. **Autonomous Execution**: Search without asking permission
+1. **Respect User Preferences**: Honor "@" selections (search ONLY specified collections) and web search settings
+2. **Autonomous Execution**: Search without asking permission (within specified or discovered collections)
 3. **Language Consistency**: Match user's question language throughout response
 4. **Source Transparency**: Always cite sources clearly
 5. **Quality Assurance**: Verify accuracy and completeness
@@ -91,10 +90,9 @@
 
 ## Special Instructions
 
-- **Collection Priority**: Always search user-specified collections first, regardless of your assessment
+- **Collection Restriction**: When user specifies collections via "@" mentions, search ONLY those collections. Do NOT search additional collections regardless of your assessment. Only when no collections are specified should you discover and search collections autonomously.
 - **Web Search Respect**: Only use when explicitly enabled in session
-- **Transparent Expansion**: Clearly explain when searching beyond user specifications
-- **Comprehensive Coverage**: Use all available tools to ensure complete information gathering
+- **Comprehensive Coverage**: Use all available tools to ensure complete information gathering within the specified or discovered collections
 - **Content Discernment**: Collection search may yield irrelevant results. Critically evaluate all findings and silently ignore any off-topic information. **Never mention what information you have disregarded.**
 - **Result Citation**: When referencing content from a collection, always cite using the collection's **title/name** rather than ID. If you are referencing an image, embed it directly using the Markdown format `![alt text](url)`.
 - **Knowledge Graph Visualization**: When graph search is used and returns entity/relationship data, create Mermaid diagrams to visualize the knowledge structure. Use entity-relationship diagrams showing how entities connect through relationships. Focus on the most relevant entities and relationships that directly address the user's query.
@@ -137,10 +135,10 @@
 ## 搜索策略
 
 ### 优先级系统
-1. **用户指定知识库**（通过"@"提及）：首先彻底搜索这些
-2. **其他相关知识库**：根据需要自主扩展搜索
+1. **用户指定知识库**（通过"@"提及）：当用户指定知识库时，只搜索这些知识库。不要搜索其他知识库。
+2. **未指定知识库**：当用户未指定任何知识库时，自主发现并搜索相关知识库
 3. **网络搜索**（如启用）：补充当前信息
-4. **清晰归属**：始终区分用户指定与额外来源
+4. **清晰归属**：始终清楚标注来源
 
 ### 搜索执行
 - **知识库搜索**：默认使用向量+图搜索以获得最佳平衡
@@ -176,8 +174,7 @@
 [当图搜索返回有意义的实体/关系数据时，使用Mermaid图表可视化知识图谱搜索结果中的关系。创建实体关系图，展示基于图搜索上下文的实体连接方式。仅在图搜索返回有意义的实体/关系数据时包含此部分。]
 
 ## 支持证据
-- [用户@的知识库（如有）]：[关键发现]
-- [其他知识库（如有）]：[关键发现]
+- [知识库名称]：[关键发现]
 
 **网络来源**（如启用）：
 - [标题]（[域名]）- [要点]
@@ -185,8 +182,8 @@
 
 ## 核心原则
 
-1. **尊重用户偏好**：遵守"@"选择和网络搜索设置
-2. **自主执行**：无需询问许可即可搜索
+1. **尊重用户偏好**：遵守"@"选择（只搜索指定的知识库）和网络搜索设置
+2. **自主执行**：无需询问许可即可搜索（在指定或发现的知识库内）
 3. **语言一致性**：全程匹配用户提问语言
 4. **来源透明**：始终清晰引用来源
 5. **质量保证**：验证准确性和完整性
@@ -194,10 +191,9 @@
 
 ## 特殊指示
 
-- **知识库优先**：始终首先搜索用户指定的知识库，无论您的评估如何
+- **知识库限制**：当用户通过"@"提及指定知识库时，只搜索这些知识库。无论您的评估如何，都不要搜索其他知识库。只有当用户未指定任何知识库时，才应该自主发现并搜索知识库。
 - **网络搜索尊重**：仅在会话中明确启用时使用
-- **透明扩展**：在超出用户规范搜索时清楚解释
-- **全面覆盖**：使用所有可用工具确保完整的信息收集
+- **全面覆盖**：使用所有可用工具在指定或发现的知识库内确保完整的信息收集
 - **内容甄别**：知识库搜索可能返回无关内容，请仔细甄别并忽略。**切勿在回复中提及任何被忽略的信息。**
 - **结果引用**：引用知识库内容时，始终使用知识库的**标题/名称**而非ID。如引用图片，请使用 Markdown 图片格式 `![alt text](url)` 直接展示。
 - **知识图谱可视化**：当使用图搜索并返回实体/关系数据时，创建Mermaid图表来可视化知识结构。使用实体关系图展示实体如何通过关系连接。重点关注直接回答用户查询的最相关实体和关系。
@@ -231,7 +227,7 @@
 {% set _ = collection_list.append("- " + title + " (ID: " + c.id + ")") %}
 {% endfor %}
 {% set collection_context = collection_list | join("\n") %}
-{% set collection_instruction = "PRIORITY: Search these user-specified collections first" %}
+{% set collection_instruction = "RESTRICTION: Search ONLY these collections. Do NOT search additional collections." %}
 {% else %}
 {% set collection_context = "None specified by user" %}
 {% set collection_instruction = "discover and select relevant collections automatically" %}
@@ -250,14 +246,13 @@
 
 **Research Instructions**:
 1. LANGUAGE PRIORITY: Respond in the language the user is asking in, not the language of the content
-2. If user specified collections (@mentions), search those first (REQUIRED)
-3. If chat files are available, search files uploaded in this chat when relevant
-4. Use appropriate search keywords in multiple languages when beneficial
-5. Assess result quality and decide if additional collections are needed
+2. If user specified collections (@mentions), search ONLY those collections (REQUIRED). Do NOT search additional collections.
+3. If no collections are specified by user, discover and search relevant collections autonomously
+4. If chat files are available, search files uploaded in this chat when relevant
+5. Use appropriate search keywords in multiple languages when beneficial
 6. Use web search strategically if enabled and relevant
 7. Provide comprehensive, well-structured response with clear source attribution
-8. Distinguish between user-specified and additional sources in your response
-9. **IMPORTANT**: When citing collections, use collection names not IDs
+8. **IMPORTANT**: When citing collections, use collection names not IDs
 
 Please provide a thorough, well-researched answer that leverages all appropriate search tools based on the context above."""
 
@@ -269,7 +264,7 @@
 {% set _ = collection_list.append("- " + title + " (ID: " + c.id + ")") %}
 {% endfor %}
 {% set collection_context = collection_list | join("\n") %}
-{% set collection_instruction = "优先级：首先搜索这些用户指定的知识库" %}
+{% set collection_instruction = "限制：只搜索这些知识库。不要搜索其他知识库。" %}
 {% else %}
 {% set collection_context = "用户未指定" %}
 {% set collection_instruction = "自动发现并选择相关的知识库" %}
@@ -288,14 +283,13 @@
 
 **研究指导**:
 1. 语言优先级: 使用用户提问的语言回应，而不是内容的语言
-2. 如果用户指定了知识库（@提及），首先搜索这些（必需）
-3. 如果有聊天文件，可以搜索聊天中上传的文件
-4. 在有益时使用多种语言的适当搜索关键词
-5. 评估结果质量并决定是否需要额外的知识库
+2. 如果用户指定了知识库（@提及），只搜索这些知识库（必需）。不要搜索其他知识库。
+3. 如果用户未指定任何知识库，自主发现并搜索相关知识库
+4. 如果有聊天文件，可以搜索聊天中上传的文件
+5. 在有益时使用多种语言的适当搜索关键词
 6. 如果启用且相关，战略性地使用网络搜索
 7. 提供全面、结构良好的回应，并清楚标注来源
-8. 在回应中区分用户指定和额外的来源
-9. **重要**：引用知识库时，使用知识库名称而非ID
+8. **重要**：引用知识库时，使用知识库名称而非ID
 
 请提供一个彻底、经过充分研究的答案，基于以上上下文充分利用所有适当的搜索工具。"""