diff --git a/crates/erp-ai/src/error.rs b/crates/erp-ai/src/error.rs
index 018c666..cf42f38 100644
--- a/crates/erp-ai/src/error.rs
+++ b/crates/erp-ai/src/error.rs
@@ -49,6 +49,9 @@ pub enum AiError {
 
     #[error("AI 配置错误: {0}")]
     ConfigError(String),
+
+    #[error("不支持的操作: {0}")]
+    UnsupportedOperation(String),
 }
 
 impl From<AiError> for AppError {
diff --git a/crates/erp-ai/src/provider/mod.rs b/crates/erp-ai/src/provider/mod.rs
index 5388dcc..3d4b431 100644
--- a/crates/erp-ai/src/provider/mod.rs
+++ b/crates/erp-ai/src/provider/mod.rs
@@ -27,4 +27,20 @@ pub trait AiProvider: Send + Sync {
 
     /// 健康检查
     async fn health_check(&self) -> AiResult<bool>;
+
+    /// Agent 专用生成方法 — 支持 Function Calling
+    /// 不支持 FC 的 Provider 使用默认实现（返回错误）
+    async fn generate_with_tools(
+        &self,
+        _messages: Vec<crate::dto::ChatMessage>,
+        _tools: Vec<crate::dto::ToolDefinition>,
+        _system_prompt: &str,
+        _model: &str,
+        _temperature: f32,
+        _max_tokens: u32,
+    ) -> AiResult<crate::dto::AgentGenerateResponse> {
+        Err(crate::error::AiError::UnsupportedOperation(
+            "Function Calling not supported by this provider".into(),
+        ))
+    }
 }