fix(docs): use correct Parameters<T> syntax in tool examples

The README examples used `#[tool(param)]` on function parameters,
which is not a supported syntax and fails to compile. Replace with
the `Parameters<T>` wrapper pattern that the macros actually expect.

Closes #812

Author: lutz-grex

README.md

@@ -141,15 +141,21 @@ Tools let servers expose callable functions to clients. Each tool has a name, de
 The `#[tool]`, `#[tool_router]`, and `#[tool_handler]` macros handle all the wiring. For a tools-only server you can use `#[tool_router(server_handler)]` to skip the separate `ServerHandler` impl:
 
 ```rust,ignore
-use rmcp::{tool, tool_router, ServiceExt, transport::stdio};
+use rmcp::{handler::server::wrapper::Parameters, schemars, tool, tool_router, ServiceExt, transport::stdio};
+
+#[derive(Debug, serde::Deserialize, schemars::JsonSchema)]
+struct AddParams {
+    a: i32,
+    b: i32,
+}
 
 #[derive(Clone)]
 struct Calculator;
 
 #[tool_router(server_handler)]
 impl Calculator {
     #[tool(description = "Add two numbers")]
-    fn add(&self, #[tool(param)] a: i32, #[tool(param)] b: i32) -> String {
+    fn add(&self, Parameters(AddParams { a, b }): Parameters<AddParams>) -> String {
         (a + b).to_string()
     }
 }
@@ -165,15 +171,21 @@ async fn main() -> anyhow::Result<()> {
 When you need custom server metadata or multiple capabilities (tools + prompts), use explicit `#[tool_handler]`:
 
 ```rust,ignore
-use rmcp::{tool, tool_router, tool_handler, ServerHandler, ServiceExt};
+use rmcp::{handler::server::wrapper::Parameters, schemars, tool, tool_router, tool_handler, ServerHandler, ServiceExt};
+
+#[derive(Debug, serde::Deserialize, schemars::JsonSchema)]
+struct AddParams {
+    a: i32,
+    b: i32,
+}
 
 #[derive(Clone)]
 struct Calculator;
 
 #[tool_router]
 impl Calculator {
     #[tool(description = "Add two numbers")]
-    fn add(&self, #[tool(param)] a: i32, #[tool(param)] b: i32) -> String {
+    fn add(&self, Parameters(AddParams { a, b }): Parameters<AddParams>) -> String {
         (a + b).to_string()
     }
 }

docs/readme/README.zh-cn.md

@@ -141,15 +141,21 @@ let quit_reason = server.cancel().await?;
 `#[tool]`、`#[tool_router]` 和 `#[tool_handler]` 宏负责所有连接工作。对于纯工具服务端，可以使用 `#[tool_router(server_handler)]` 来省略单独的 `ServerHandler` 实现：
 
 ```rust,ignore
-use rmcp::{tool, tool_router, ServiceExt, transport::stdio};
+use rmcp::{handler::server::wrapper::Parameters, schemars, tool, tool_router, ServiceExt, transport::stdio};
+
+#[derive(Debug, serde::Deserialize, schemars::JsonSchema)]
+struct AddParams {
+    a: i32,
+    b: i32,
+}
 
 #[derive(Clone)]
 struct Calculator;
 
 #[tool_router(server_handler)]
 impl Calculator {
     #[tool(description = "Add two numbers")]
-    fn add(&self, #[tool(param)] a: i32, #[tool(param)] b: i32) -> String {
+    fn add(&self, Parameters(AddParams { a, b }): Parameters<AddParams>) -> String {
         (a + b).to_string()
     }
 }
@@ -165,15 +171,21 @@ async fn main() -> anyhow::Result<()> {
 当需要自定义服务端元数据或多种能力（工具 + 提示词）时，使用显式的 `#[tool_handler]`：
 
 ```rust,ignore
-use rmcp::{tool, tool_router, tool_handler, ServerHandler, ServiceExt};
+use rmcp::{handler::server::wrapper::Parameters, schemars, tool, tool_router, tool_handler, ServerHandler, ServiceExt};
+
+#[derive(Debug, serde::Deserialize, schemars::JsonSchema)]
+struct AddParams {
+    a: i32,
+    b: i32,
+}
 
 #[derive(Clone)]
 struct Calculator;
 
 #[tool_router]
 impl Calculator {
     #[tool(description = "Add two numbers")]
-    fn add(&self, #[tool(param)] a: i32, #[tool(param)] b: i32) -> String {
+    fn add(&self, Parameters(AddParams { a, b }): Parameters<AddParams>) -> String {
         (a + b).to_string()
     }
 }