Implement SEP-1319: Decouple Request Payload from RPC Methods (#617)

* feat: implement SEP-1319 Decouple Request Payload from RPC Methods

* test: update tests

* fix: update handler trait methods to use new types

* fix: update examples

* fix: correct deprecation version

* fix: update wrapper macros to use new *Params type names

examples/clients/src/collection.rs

@@ -6,7 +6,7 @@ use std::collections::HashMap;
 
 use anyhow::Result;
 use rmcp::{
-    model::CallToolRequestParam,
+    model::CallToolRequestParams,
     service::ServiceExt,
     transport::{ConfigureCommandExt, TokioChildProcess},
 };
@@ -46,7 +46,8 @@ async fn main() -> Result<()> {
 
         // Call tool 'git_status' with arguments = {"repo_path": "."}
         let _tool_result = client
-            .call_tool(CallToolRequestParam {
+            .call_tool(CallToolRequestParams {
+                meta: None,
                 name: "git_status".into(),
                 arguments: serde_json::json!({ "repo_path": "." }).as_object().cloned(),
                 task: None,

examples/clients/src/everything_stdio.rs

@@ -1,7 +1,7 @@
 use anyhow::Result;
 use rmcp::{
     ServiceExt,
-    model::{CallToolRequestParam, GetPromptRequestParam, ReadResourceRequestParam},
+    model::{CallToolRequestParams, GetPromptRequestParams, ReadResourceRequestParams},
     object,
     transport::{ConfigureCommandExt, TokioChildProcess},
 };
@@ -37,7 +37,8 @@ async fn main() -> Result<()> {
 
     // Call tool echo
     let tool_result = client
-        .call_tool(CallToolRequestParam {
+        .call_tool(CallToolRequestParams {
+            meta: None,
             name: "echo".into(),
             arguments: Some(object!({ "message": "hi from rmcp" })),
             task: None,
@@ -47,7 +48,8 @@ async fn main() -> Result<()> {
 
     // Call tool longRunningOperation
     let tool_result = client
-        .call_tool(CallToolRequestParam {
+        .call_tool(CallToolRequestParams {
+            meta: None,
             name: "longRunningOperation".into(),
             arguments: Some(object!({ "duration": 3, "steps": 1 })),
             task: None,
@@ -61,7 +63,8 @@ async fn main() -> Result<()> {
 
     // Read resource
     let resource = client
-        .read_resource(ReadResourceRequestParam {
+        .read_resource(ReadResourceRequestParams {
+            meta: None,
             uri: "test://static/resource/3".into(),
         })
         .await?;
@@ -73,7 +76,8 @@ async fn main() -> Result<()> {
 
     // Get simple prompt
     let prompt = client
-        .get_prompt(GetPromptRequestParam {
+        .get_prompt(GetPromptRequestParams {
+            meta: None,
             name: "simple_prompt".into(),
             arguments: None,
         })
@@ -82,7 +86,8 @@ async fn main() -> Result<()> {
 
     // Get complex prompt (returns text & image)
     let prompt = client
-        .get_prompt(GetPromptRequestParam {
+        .get_prompt(GetPromptRequestParams {
+            meta: None,
             name: "complex_prompt".into(),
             arguments: Some(object!({ "temperature": "0.5", "style": "formal" })),
         })

examples/clients/src/git_stdio.rs

@@ -1,6 +1,6 @@
 use rmcp::{
     RmcpError,
-    model::CallToolRequestParam,
+    model::CallToolRequestParams,
     service::ServiceExt,
     transport::{ConfigureCommandExt, TokioChildProcess},
 };
@@ -39,7 +39,8 @@ async fn main() -> Result<(), RmcpError> {
 
     // Call tool 'git_status' with arguments = {"repo_path": "."}
     let tool_result = client
-        .call_tool(CallToolRequestParam {
+        .call_tool(CallToolRequestParams {
+            meta: None,
             name: "git_status".into(),
             arguments: serde_json::json!({ "repo_path": "." }).as_object().cloned(),
             task: None,

examples/clients/src/progress_client.rs

@@ -8,7 +8,7 @@ use clap::{Parser, ValueEnum};
 use rmcp::{
     ClientHandler, ServiceExt,
     model::{
-        CallToolRequestParam, ClientCapabilities, ClientInfo, Implementation,
+        CallToolRequestParams, ClientCapabilities, ClientInfo, Implementation,
         ProgressNotificationParam,
     },
     service::{NotificationContext, RoleClient},
@@ -123,6 +123,7 @@ impl ClientHandler for ProgressAwareClient {
 
     fn get_info(&self) -> ClientInfo {
         ClientInfo {
+            meta: None,
             protocol_version: Default::default(),
             capabilities: ClientCapabilities::default(),
             client_info: Implementation {
@@ -181,7 +182,8 @@ async fn test_stdio_transport(records: u32) -> Result<()> {
     // Call stream processor tool
     tracing::info!("Starting to process {} records...", records);
     let tool_result = service
-        .call_tool(CallToolRequestParam {
+        .call_tool(CallToolRequestParams {
+            meta: None,
             name: "stream_processor".into(),
             arguments: None,
             task: None,
@@ -236,7 +238,8 @@ async fn test_http_transport(http_url: &str, records: u32) -> Result<()> {
     // Call stream processor tool
     tracing::info!("Starting to process {} records...", records);
     let tool_result = client
-        .call_tool(CallToolRequestParam {
+        .call_tool(CallToolRequestParams {
+            meta: None,
             name: "stream_processor".into(),
             arguments: None,
             task: None,

examples/clients/src/sampling_stdio.rs

@@ -31,7 +31,7 @@ impl SamplingDemoClient {
 impl ClientHandler for SamplingDemoClient {
     async fn create_message(
         &self,
-        params: CreateMessageRequestParam,
+        params: CreateMessageRequestParams,
         _context: RequestContext<RoleClient>,
     ) -> Result<CreateMessageResult, ErrorData> {
         tracing::info!("Received sampling request with {:?}", params);
@@ -101,7 +101,8 @@ async fn main() -> Result<()> {
             // Test the ask_llm tool
             tracing::info!("Testing ask_llm tool...");
             match client
-                .call_tool(CallToolRequestParam {
+                .call_tool(CallToolRequestParams {
+                    meta: None,
                     name: "ask_llm".into(),
                     arguments: Some(object!({
                         "question": "Hello world"

examples/clients/src/streamable_http.rs

@@ -1,7 +1,7 @@
 use anyhow::Result;
 use rmcp::{
     ServiceExt,
-    model::{CallToolRequestParam, ClientCapabilities, ClientInfo, Implementation},
+    model::{CallToolRequestParams, ClientCapabilities, ClientInfo, Implementation},
     transport::StreamableHttpClientTransport,
 };
 use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
@@ -18,6 +18,7 @@ async fn main() -> Result<()> {
         .init();
     let transport = StreamableHttpClientTransport::from_uri("http://localhost:8000/mcp");
     let client_info = ClientInfo {
+        meta: None,
         protocol_version: Default::default(),
         capabilities: ClientCapabilities::default(),
         client_info: Implementation {
@@ -41,7 +42,8 @@ async fn main() -> Result<()> {
     tracing::info!("Available tools: {tools:#?}");
 
     let tool_result = client
-        .call_tool(CallToolRequestParam {
+        .call_tool(CallToolRequestParams {
+            meta: None,
             name: "increment".into(),
             arguments: serde_json::json!({}).as_object().cloned(),
             task: None,