docs(macro): fix visibility attribute's usage of handler macro (#481)

Author: 4t145

crates/rmcp-macros/README.md

@@ -72,7 +72,7 @@ Or specify the visibility and router name, which would be helpful when you want
 
 ```rust
 mod a {
-    #[tool_router(router = tool_router_a, vis = pub)]
+    #[tool_router(router = tool_router_a, vis = "pub")]
     impl MyToolHandler {
         #[tool]
         fn my_tool_a() {
@@ -82,7 +82,7 @@ mod a {
 }
 
 mod b {
-    #[tool_router(router = tool_router_b, vis = pub)]
+    #[tool_router(router = tool_router_b, vis = "pub")]
     impl MyToolHandler {
         #[tool]
         fn my_tool_b() {

crates/rmcp-macros/src/lib.rs

@@ -75,7 +75,7 @@ pub fn tool(attr: TokenStream, input: TokenStream) -> TokenStream {
 ///
 /// ```rust,ignore
 /// mod a {
-///     #[tool_router(router = tool_router_a, vis = pub)]
+///     #[tool_router(router = tool_router_a, vis = "pub")]
 ///     impl MyToolHandler {
 ///         #[tool]
 ///         fn my_tool_a() {
@@ -85,7 +85,7 @@ pub fn tool(attr: TokenStream, input: TokenStream) -> TokenStream {
 /// }
 ///
 /// mod b {
-///     #[tool_router(router = tool_router_b, vis = pub)]
+///     #[tool_router(router = tool_router_b, vis = "pub")]
 ///     impl MyToolHandler {
 ///         #[tool]
 ///         fn my_tool_b() {

crates/rmcp-macros/src/tool_router.rs

@@ -76,6 +76,7 @@ mod test {
     fn test_router_attr() -> Result<(), Box<dyn std::error::Error>> {
         let attr = quote! {
             router = test_router,
+            vis = "pub(crate)"
         };
         let attr_args = NestedMeta::parse_meta_list(attr)?;
         let ToolRouterAttribute { router, vis } = ToolRouterAttribute::from_list(&attr_args)?;