diff --git a/prompt/system_prompt.md b/prompt/system_prompt.md
index 32439de..d740313 100644
--- a/prompt/system_prompt.md
+++ b/prompt/system_prompt.md
@@ -14,7 +14,19 @@ The filesystem backend is currently operating in: `{agent_dir_path}`
 - Never use relative paths in bash commands - always construct full absolute paths
 - Use the working directory from <env> to construct absolute paths
 
-**2. Skill Script Path Conversion**
+**2. Skills vs Tools - CRITICAL DISTINCTION**
+
+**Skills are NOT tools.** Do NOT attempt to call a skill as a tool_call/function_call.
+
+- **Tools** (e.g., `rag_retrieve`, `read_file`, `bash`): Directly callable via tool_call interface with structured parameters.
+- **Skills** (e.g., `baidu-search`, `pdf`, `xlsx`): Multi-step workflows executed by: (1) reading SKILL.md, (2) extracting the command, (3) running it via the `bash` tool.
+
+❌ WRONG: Generating a tool_call with `{"name": "baidu-search", "arguments": {...}}`
+✅ CORRECT: Using `read_file` to read SKILL.md, then using `bash` to execute the script
+
+If you see a skill name in the "Available Skills" list, it is NEVER a tool you can call directly.
+
+**3. Skill Script Path Conversion**
 
 When executing scripts from SKILL.md files, you MUST convert relative paths to absolute paths:
 
@@ -29,14 +41,14 @@ When executing scripts from SKILL.md files, you MUST convert relative paths to a
         └── scriptB.py       # Actual script B file
 ```
 
-**3. Workspace Directory Structure**
+**4. Workspace Directory Structure**
 
 - **`{agent_dir_path}/skills/`** - Skill packages with embedded scripts
 - **`{agent_dir_path}/dataset/`** - Store file datasets and document data
 - **`{agent_dir_path}/executable_code/`** - Place generated executable scripts here (not skill scripts)
 - **`{agent_dir_path}/download/`** - Store downloaded files and content
 
-**4. Executable Code Organization**
+**5. Executable Code Organization**
 
 When creating scripts in `executable_code/`, follow these organization rules:
 
diff --git a/prompt/system_prompt_deep_agent.md b/prompt/system_prompt_deep_agent.md
index 336a265..ecca407 100644
--- a/prompt/system_prompt_deep_agent.md
+++ b/prompt/system_prompt_deep_agent.md
@@ -83,6 +83,18 @@ When using the write_todos tool:
 
 The todo list is a planning tool - use it judiciously to avoid overwhelming the user with excessive task tracking.
 
+### Skills vs Tools - CRITICAL DISTINCTION
+
+**Skills are NOT tools.** Do NOT attempt to call a skill as a tool_call/function_call.
+
+- **Tools** (e.g., `rag_retrieve`, `read_file`, `bash`): Directly callable via tool_call interface with structured parameters.
+- **Skills** (e.g., `baidu-search`, `pdf`, `xlsx`): Multi-step workflows executed by: (1) reading SKILL.md, (2) extracting the command, (3) running it via the `bash` tool.
+
+❌ WRONG: Generating a tool_call with `{"name": "baidu-search", "arguments": {...}}`
+✅ CORRECT: Using `read_file` to read SKILL.md, then using `bash` to execute the script
+
+If you see a skill name in the "Available Skills" list, it is NEVER a tool you can call directly.
+
 ### Skill Execution Workflow
 
 **CRITICAL**: When you need to use a skill, follow this exact workflow: