feat(task): add task support (SEP-1686)

crates/rmcp/Cargo.toml

@@ -197,3 +197,8 @@ path = "tests/test_progress_subscriber.rs"
 name = "test_elicitation"
 required-features = ["elicitation", "client", "server"]
 path = "tests/test_elicitation.rs"
+
+[[test]]
+name = "test_task"
+required-features = ["server", "client", "macros"]
+path = "tests/test_task.rs"

crates/rmcp/src/error.rs

@@ -41,6 +41,10 @@ pub enum RmcpError {
         error: Box<dyn std::error::Error + Send + Sync>,
     },
     // and cancellation shouldn't be an error?
+
+    // TODO: add more error variants as needed
+    #[error("Task error: {0}")]
+    TaskError(String),
 }
 
 impl RmcpError {

crates/rmcp/src/handler/server.rs

@@ -11,6 +11,7 @@ pub mod router;
 pub mod tool;
 pub mod tool_name_validation;
 pub mod wrapper;
+
 impl<H: ServerHandler> Service<RoleServer> for H {
     async fn handle_request(
         &self,
@@ -61,14 +62,29 @@ impl<H: ServerHandler> Service<RoleServer> for H {
                 .unsubscribe(request.params, context)
                 .await
                 .map(ServerResult::empty),
-            ClientRequest::CallToolRequest(request) => self
-                .call_tool(request.params, context)
-                .await
-                .map(ServerResult::CallToolResult),
+            ClientRequest::CallToolRequest(request) => {
+                if request.params.task.is_some() {
+                    tracing::info!("Enqueueing task for tool call: {}", request.params.name);
+                    self.enqueue_task(request.params, context.clone()).await.map(ServerResult::GetTaskInfoResult)
+                }else{
+                   self
+                    .call_tool(request.params, context)
+                    .await
+                    .map(ServerResult::CallToolResult)
+                }
+            },
             ClientRequest::ListToolsRequest(request) => self
                 .list_tools(request.params, context)
                 .await
                 .map(ServerResult::ListToolsResult),
+            ClientRequest::ListTasksRequest(request) => self
+                .list_tasks(request.params, context)
+                .await
+                .map(ServerResult::ListTasksResult),
+            ClientRequest::GetTaskInfoRequest(request) => self
+                .get_task_info(request.params, context)
+                .await
+                .map(ServerResult::GetTaskInfoResult),
         }
     }
 
@@ -104,6 +120,15 @@ impl<H: ServerHandler> Service<RoleServer> for H {
 
 #[allow(unused_variables)]
 pub trait ServerHandler: Sized + Send + Sync + 'static {
+    fn enqueue_task(
+        &self,
+        _request: CallToolRequestParam,
+        _context: RequestContext<RoleServer>,
+    ) -> impl Future<Output = Result<GetTaskInfoResult, McpError>> + Send + '_ {
+        std::future::ready(Err(McpError::internal_error(
+            "Task processing not implemented".to_string(),
+        None)))
+    }
     fn ping(
         &self,
         context: RequestContext<RoleServer>,
@@ -240,4 +265,20 @@ pub trait ServerHandler: Sized + Send + Sync + 'static {
     fn get_info(&self) -> ServerInfo {
         ServerInfo::default()
     }
+
+    fn list_tasks(
+        &self,
+        request: Option<PaginatedRequestParam>,
+        context: RequestContext<RoleServer>,
+    ) -> impl Future<Output = Result<ListTasksResult, McpError>> + Send + '_ {
+        std::future::ready(Err(McpError::method_not_found::<ListTasksMethod>()))
+    }
+
+    fn get_task_info(
+        &self,
+        request: GetTaskInfoParam,
+        context: RequestContext<RoleServer>,
+    ) -> impl Future<Output = Result<GetTaskInfoResult, McpError>> + Send + '_ {
+        std::future::ready(Err(McpError::method_not_found::<GetTaskInfoMethod>()))
+    }
 }

crates/rmcp/src/handler/server/tool.rs

@@ -33,19 +33,21 @@ pub struct ToolCallContext<'s, S> {
     pub service: &'s S,
     pub name: Cow<'static, str>,
     pub arguments: Option<JsonObject>,
+    pub task:Option<JsonObject>,
 }
 
 impl<'s, S> ToolCallContext<'s, S> {
     pub fn new(
         service: &'s S,
-        CallToolRequestParam { name, arguments }: CallToolRequestParam,
+        CallToolRequestParam { name, arguments, task }: CallToolRequestParam,
         request_context: RequestContext<RoleServer>,
     ) -> Self {
         Self {
             request_context,
             service,
             name,
             arguments,
+            task,
         }
     }
     pub fn name(&self) -> &str {

crates/rmcp/src/lib.rs

@@ -162,6 +162,7 @@ pub use service::{RoleClient, serve_client};
 pub use service::{RoleServer, serve_server};
 
 pub mod handler;
+pub mod task_manager;
 pub mod transport;
 
 // re-export

crates/rmcp/src/model.rs

@@ -8,6 +8,7 @@ mod meta;
 mod prompt;
 mod resource;
 mod serde_impl;
+mod task;
 mod tool;
 pub use annotated::*;
 pub use capabilities::*;
@@ -19,6 +20,7 @@ pub use prompt::*;
 pub use resource::*;
 use serde::{Deserialize, Serialize, de::DeserializeOwned};
 use serde_json::Value;
+pub use task::*;
 pub use tool::*;
 
 /// A JSON object type alias for convenient handling of JSON data.
@@ -1639,6 +1641,7 @@ paginated_result!(
     }
 );
 
+
 const_string!(CallToolRequestMethod = "tools/call");
 /// Parameters for calling a tool provided by an MCP server.
 ///
@@ -1653,6 +1656,8 @@ pub struct CallToolRequestParam {
     /// Arguments to pass to the tool (must match the tool's input schema)
     #[serde(skip_serializing_if = "Option::is_none")]
     pub arguments: Option<JsonObject>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub task: Option<JsonObject>,
 }
 
 /// Request to call a specific tool
@@ -1691,6 +1696,23 @@ pub struct GetPromptResult {
     pub messages: Vec<PromptMessage>,
 }
 
+// =============================================================================
+// TASK MANAGEMENT
+// =============================================================================
+
+const_string!(GetTaskInfoMethod = "tasks/get");
+pub type GetTaskInfoRequest = Request<GetTaskInfoMethod, GetTaskInfoParam>;
+
+#[derive(Debug, Serialize, Deserialize, Clone, PartialEq)]
+#[serde(rename_all = "camelCase")]
+#[cfg_attr(feature = "schemars", derive(schemars::JsonSchema))]
+pub struct GetTaskInfoParam {
+    pub task_id: String,
+}
+
+const_string!(ListTasksMethod = "tasks/list");
+pub type ListTasksRequest = RequestOptionalParam<ListTasksMethod, PaginatedRequestParam>;
+
 // =============================================================================
 // MESSAGE TYPE UNIONS
 // =============================================================================
@@ -1757,7 +1779,9 @@ ts_union!(
     | SubscribeRequest
     | UnsubscribeRequest
     | CallToolRequest
-    | ListToolsRequest;
+    | ListToolsRequest
+    | GetTaskInfoRequest
+    | ListTasksRequest;
 );
 
 impl ClientRequest {
@@ -1776,6 +1800,8 @@ impl ClientRequest {
             ClientRequest::UnsubscribeRequest(r) => r.method.as_str(),
             ClientRequest::CallToolRequest(r) => r.method.as_str(),
             ClientRequest::ListToolsRequest(r) => r.method.as_str(),
+            ClientRequest::GetTaskInfoRequest(r) => r.method.as_str(),
+            ClientRequest::ListTasksRequest(r) => r.method.as_str(),
         }
     }
 }
@@ -1832,6 +1858,8 @@ ts_union!(
     | CallToolResult
     | ListToolsResult
     | CreateElicitationResult
+    | GetTaskInfoResult
+    | ListTasksResult
     | EmptyResult
     ;
 );
@@ -1842,6 +1870,28 @@ impl ServerResult {
     }
 }
 
+// =============================================================================
+// TASK RESULT TYPES (Server responses for task queries)
+// =============================================================================
+#[derive(Debug, Serialize, Deserialize, Clone, PartialEq)]
+#[serde(rename_all = "camelCase")]
+#[cfg_attr(feature = "schemars", derive(schemars::JsonSchema))]
+pub struct GetTaskInfoResult {
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub task: Option<crate::model::Task>,
+}
+
+#[derive(Debug, Serialize, Deserialize, Clone, PartialEq, Default)]
+#[serde(rename_all = "camelCase")]
+#[cfg_attr(feature = "schemars", derive(schemars::JsonSchema))]
+pub struct ListTasksResult {
+    pub tasks: Vec<crate::model::Task>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub next_cursor: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub total: Option<u64>,
+}
+
 pub type ServerJsonRpcMessage = JsonRpcMessage<ServerRequest, ServerResult, ServerNotification>;
 
 impl TryInto<CancelledNotification> for ServerNotification {

crates/rmcp/src/model/meta.rs

@@ -86,6 +86,8 @@ variant_extension! {
         UnsubscribeRequest
         CallToolRequest
         ListToolsRequest
+        GetTaskInfoRequest
+        ListTasksRequest
     }
 }
 
@@ -154,6 +156,7 @@ impl Meta {
         })
     }
 
+
     pub fn set_progress_token(&mut self, token: ProgressToken) {
         match token.0 {
             NumberOrString::String(ref s) => self.0.insert(