feat: Redesign the tool system

llm-worker-macros/src/lib.rs

@@ -113,7 +113,7 @@ fn generate_tool_impl(self_ty: &Type, method: &syn::ImplItemFn) -> proc_macro2::
     let pascal_name = to_pascal_case(&method_name.to_string());
     let tool_struct_name = format_ident!("Tool{}", pascal_name);
     let args_struct_name = format_ident!("{}Args", pascal_name);
-    let factory_name = format_ident!("{}_tool", method_name);
+    let definition_name = format_ident!("{}_definition", method_name);
 
     // ドキュメントコメントから説明を取得
     let description = extract_doc_comment(&method.attrs);
@@ -247,29 +247,24 @@ fn generate_tool_impl(self_ty: &Type, method: &syn::ImplItemFn) -> proc_macro2::
 
         #[async_trait::async_trait]
         impl ::llm_worker::tool::Tool for #tool_struct_name {
-            fn name(&self) -> &str {
-                #tool_name
-            }
-
-            fn description(&self) -> &str {
-                #description
-            }
-
-            fn input_schema(&self) -> serde_json::Value {
-                let schema = schemars::schema_for!(#args_struct_name);
-                serde_json::to_value(schema).unwrap_or(serde_json::json!({}))
-            }
-
             async fn execute(&self, input_json: &str) -> Result<String, ::llm_worker::tool::ToolError> {
                 #execute_body
             }
         }
 
         impl #self_ty {
-            pub fn #factory_name(&self) -> #tool_struct_name {
-                #tool_struct_name {
-                    ctx: self.clone()
-                }
+            /// ToolDefinition を取得（Worker への登録用）
+            pub fn #definition_name(&self) -> ::llm_worker::tool::ToolDefinition {
+                let ctx = self.clone();
+                ::std::sync::Arc::new(move || {
+                    let schema = schemars::schema_for!(#args_struct_name);
+                    let meta = ::llm_worker::tool::ToolMeta::new(#tool_name)
+                        .description(#description)
+                        .input_schema(serde_json::to_value(schema).unwrap_or(serde_json::json!({})));
+                    let tool: ::std::sync::Arc<dyn ::llm_worker::tool::Tool> =
+                        ::std::sync::Arc::new(#tool_struct_name { ctx: ctx.clone() });
+                    (meta, tool)
+                })
             }
         }
     }