diff --git a/src/agent/system_prompt.rs b/src/agent/system_prompt.rs
index 00f48f9..7927358 100644
--- a/src/agent/system_prompt.rs
+++ b/src/agent/system_prompt.rs
@@ -84,7 +84,9 @@ pub fn generate_system_env_prompt(config: &crate::config::LLMProviderConfig) ->
         _ => OS,
     };
 
-    let shell = env::var("SHELL").unwrap_or_else(|_| "unknown".to_string());
+    // 使用 platform 模块获取 Shell 信息，与 bash 工具保持一致
+    let shell_info = crate::platform::ShellInfo::default();
+    let shell = shell_info.executable;
     let cwd = env::current_dir()
         .map(|p| p.display().to_string())
         .unwrap_or_else(|_| "unknown".to_string());