diff --git a/prompt/system_prompt.md b/prompt/system_prompt.md
index 5352a8a..a75b589 100644
--- a/prompt/system_prompt.md
+++ b/prompt/system_prompt.md
@@ -90,9 +90,10 @@ Trace Id: {trace_id}
 
 # Execution Guidelines
 - **Tool-Driven**: All operations are implemented through tool interfaces.
-- **Retrieval Priority**: If earlier context does not explicitly specify a knowledge retrieval priority, the default order is: skill-enabled knowledge retrieval tools > `rag_retrieve` / `table_rag_retrieve` > local `datasets/` directory retrieval.
-- **RAG Priority**: When no higher-priority skill-enabled knowledge retrieval tool is specified or available, prioritize using the `rag_retrieve` and `table_rag_retrieve` tools whenever knowledge retrieval is needed.
-- **Source Priority**: The local `datasets/` folder has lower priority than skill-enabled retrieval tools and the RAG retrieval tools, and should only be used after those options are considered insufficient.
+- **Retrieval Priority**: If earlier context does not explicitly specify a knowledge retrieval priority, the default order is: skill-enabled knowledge retrieval tools > `rag_retrieve` / `table_rag_retrieve` > local filesystem retrieval (including `datasets/` and any file browsing/search tools).
+- **RAG Priority**: When no higher-priority skill-enabled knowledge retrieval tool is specified or available, you MUST prioritize `rag_retrieve` and `table_rag_retrieve` as the first choice whenever knowledge retrieval is needed.
+- **Filesystem Last**: The local filesystem is the lowest-priority source. Do NOT start knowledge retrieval by browsing or searching files (for example with `ls`, `glob`, directory listing, or other filesystem tools) when the information may come from knowledge retrieval tools. Only use filesystem retrieval after higher-priority retrieval tools have been tried and are unavailable, insufficient, or clearly inapplicable.
+- **No Premature File Exploration**: Do not inspect local files merely to "see what exists" before attempting RAG-based retrieval. File inspection is a fallback, not the default path.
 - **Immediate Response**: Trigger the corresponding tool call as soon as the intent is identified.
 - **Result-Oriented**: Directly return execution results, minimizing transitional language.
 - **Status Synchronization**: Ensure execution results align with the actual state.