feat(task): route server-originated tasks/* to ClientHandler (SEP-1686)#816

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feat(task): route server-originated tasks/* to ClientHandler (SEP-1686) #816

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726d182
feat(task): route server-originated tasks/* to ClientHandler (SEP-1686)
TheUnderdev Apr 20, 2026
62b4b40
fix(task): rename tasks/cancel to tasks/delete (SEP-1686 §3.6)
TheUnderdev May 13, 2026
0c4d5df
chore(task): regen golden schemas after rebase; relax semver enum lint
TheUnderdev Jun 23, 2026
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30 changes: 8 additions & 22 deletions crates/rmcp-macros/src/task_handler.rs
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Original file line numberDiff line numberDiff line change
Expand Up@@ -223,38 +223,24 @@ pub fn task_handler(attr: TokenStream, input: TokenStream) -> syn::Result<TokenS
.push(syn::parse2::<ImplItem>(get_result_fn)?);
}

if !has_method("cancel_task", &item_impl) {
let cancel_fn = quote! {
async fn cancel_task(
if !has_method("delete_task", &item_impl) {
let delete_fn = quote! {
async fn delete_task(
&self,
request: rmcp::model::CancelTaskParams,
request: rmcp::model::DeleteTaskParams,
_context: rmcp::service::RequestContext<rmcp::RoleServer>,
) -> Result<rmcp::model::CancelTaskResult, McpError> {
use rmcp::task_manager::current_timestamp;
) -> Result<rmcp::model::DeleteTaskResult, McpError> {
let task_id = request.task_id;
let mut processor = (#processor).lock().await;

if processor.cancel_task(&task_id) {
let timestamp = current_timestamp();
let task = rmcp::model::Task::new(
task_id,
rmcp::model::TaskStatus::Cancelled,
timestamp.clone(),
timestamp,
);
return Ok(rmcp::model::CancelTaskResult { meta: None, task });
}

// If already completed, signal it's not cancellable
let exists_completed = processor.peek_completed().iter().any(|r| r.descriptor.operation_id == task_id);
if exists_completed {
return Err(McpError::invalid_request(format!("task already completed: {}", task_id), None));
if processor.delete_task(&task_id) {
return Ok(rmcp::model::DeleteTaskResult { meta: None });
}

Err(McpError::resource_not_found(format!("task not found: {}", task_id), None))
}
};
item_impl.items.push(syn::parse2::<ImplItem>(cancel_fn)?);
item_impl.items.push(syn::parse2::<ImplItem>(delete_fn)?);
}

// Auto-generate get_info() if not already provided and no sibling tool/prompt handler
Expand Down
15 changes: 15 additions & 0 deletions crates/rmcp/Cargo.toml
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Original file line numberDiff line numberDiff line change
Expand Up@@ -42,6 +42,16 @@ features = [
]
rustdoc-args = ["--cfg", "docsrs"]

# The protocol message unions in `model.rs` (`ClientRequest`, `ServerRequest`,
# `ClientResult`, `ServerResult`, …) are generated by `ts_union!` and are
# intentionally `#[non_exhaustive]`-free (see the `clippy::exhaustive_enums`
# expectation on the macro): each new spec revision adds message variants.
# Adding a variant is non-breaking for downstream consumers — the enums are
# `#[serde(untagged)]` and gain `From` impls — so `enum_variant_added` is
# expected churn rather than a true semver break.
[package.metadata.cargo-semver-checks.lints]
enum_variant_added = "allow"

[dependencies]
async-trait = "0.1.89"
serde = { version = "1.0", features = ["derive", "rc"] }
Expand DownExpand Up@@ -293,6 +303,11 @@ name = "test_custom_request"
required-features = ["server", "client"]
path = "tests/test_custom_request.rs"

[[test]]
name = "test_task_client_receiver"
required-features = ["server", "client"]
path = "tests/test_task_client_receiver.rs"

[[test]]
name = "test_prompt_macros"
required-features = ["server", "client"]
Expand Down
110 changes: 110 additions & 0 deletions crates/rmcp/src/handler/client.rs
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Original file line numberDiff line numberDiff line change
Expand Up@@ -30,6 +30,22 @@ impl<H: ClientHandler> Service<RoleClient> for H {
.create_elicitation(request.params, context)
.await
.map(ClientResult::CreateElicitationResult),
ServerRequest::ListTasksRequest(request) => self
.list_tasks(request.params, context)
.await
.map(ClientResult::ListTasksResult),
ServerRequest::GetTaskInfoRequest(request) => self
.get_task_info(request.params, context)
.await
.map(ClientResult::GetTaskResult),
ServerRequest::GetTaskResultRequest(request) => self
.get_task_result(request.params, context)
.await
.map(ClientResult::GetTaskPayloadResult),
ServerRequest::DeleteTaskRequest(request) => self
.delete_task(request.params, context)
.await
.map(ClientResult::DeleteTaskResult),
ServerRequest::CustomRequest(request) => self
.on_custom_request(request, context)
.await
Expand DownExpand Up@@ -191,6 +207,68 @@ pub trait ClientHandler: Sized + Send + Sync + 'static {
)))
}

/// Handle a `tasks/list` request from a server. Only relevant when the
/// client is also a task *receiver* (e.g. it accepted a task-augmented
/// `sampling/createMessage` or `elicitation/create` request).
///
/// # Default Behavior
/// Returns `-32601` (Method not found). Clients that advertise
/// `capabilities.tasks.list` must override this.
fn list_tasks(
&self,
request: Option<PaginatedRequestParams>,
context: RequestContext<RoleClient>,
) -> impl Future<Output = Result<ListTasksResult, McpError>> + MaybeSendFuture + '_ {
let _ = (request, context);
std::future::ready(Err(McpError::method_not_found::<ListTasksMethod>()))
}

/// Handle a `tasks/get` request from a server. Only relevant when the
/// client is also a task *receiver* (e.g. it accepted a task-augmented
/// `sampling/createMessage` or `elicitation/create` request).
///
/// # Default Behavior
/// Returns `-32601` (Method not found). Clients that advertise
/// `capabilities.tasks.requests.sampling.createMessage` or
/// `capabilities.tasks.requests.elicitation.create` must override this.
fn get_task_info(
&self,
request: GetTaskInfoParams,
context: RequestContext<RoleClient>,
) -> impl Future<Output = Result<GetTaskResult, McpError>> + MaybeSendFuture + '_ {
let _ = (request, context);
std::future::ready(Err(McpError::method_not_found::<GetTaskInfoMethod>()))
}

/// Handle a `tasks/result` request from a server. Only relevant when
/// the client is also a task *receiver*.
///
/// # Default Behavior
/// Returns `-32601` (Method not found).
fn get_task_result(
&self,
request: GetTaskResultParams,
context: RequestContext<RoleClient>,
) -> impl Future<Output = Result<GetTaskPayloadResult, McpError>> + MaybeSendFuture + '_ {
let _ = (request, context);
std::future::ready(Err(McpError::method_not_found::<GetTaskResultMethod>()))
}

/// Handle a `tasks/delete` request from a server (SEP-1686 §3.6).
/// Only relevant when the client is also a task *receiver*.
///
/// # Default Behavior
/// Returns `-32601` (Method not found). Task receivers must override this
/// to delete the task and any associated stored result.
fn delete_task(
&self,
request: DeleteTaskParams,
context: RequestContext<RoleClient>,
) -> impl Future<Output = Result<DeleteTaskResult, McpError>> + MaybeSendFuture + '_ {
let _ = (request, context);
std::future::ready(Err(McpError::method_not_found::<DeleteTaskMethod>()))
}

fn on_cancelled(
&self,
params: CancelledNotificationParam,
Expand DownExpand Up@@ -310,6 +388,38 @@ macro_rules! impl_client_handler_for_wrapper {
(**self).on_custom_request(request, context)
}

fn list_tasks(
&self,
request: Option<PaginatedRequestParams>,
context: RequestContext<RoleClient>,
) -> impl Future<Output = Result<ListTasksResult, McpError>> + MaybeSendFuture + '_ {
(**self).list_tasks(request, context)
}

fn get_task_info(
&self,
request: GetTaskInfoParams,
context: RequestContext<RoleClient>,
) -> impl Future<Output = Result<GetTaskResult, McpError>> + MaybeSendFuture + '_ {
(**self).get_task_info(request, context)
}

fn get_task_result(
&self,
request: GetTaskResultParams,
context: RequestContext<RoleClient>,
) -> impl Future<Output = Result<GetTaskPayloadResult, McpError>> + MaybeSendFuture + '_ {
(**self).get_task_result(request, context)
}

fn delete_task(
&self,
request: DeleteTaskParams,
context: RequestContext<RoleClient>,
) -> impl Future<Output = Result<DeleteTaskResult, McpError>> + MaybeSendFuture + '_ {
(**self).delete_task(request, context)
}

fn on_cancelled(
&self,
params: CancelledNotificationParam,
Expand Down
22 changes: 11 additions & 11 deletions crates/rmcp/src/handler/server.rs
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Original file line numberDiff line numberDiff line change
Expand Up@@ -125,10 +125,10 @@ impl<H: ServerHandler> Service<RoleServer> for H {
.get_task_result(request.params, context)
.await
.map(ServerResult::GetTaskPayloadResult),
ClientRequest::CancelTaskRequest(request) => self
.cancel_task(request.params, context)
ClientRequest::DeleteTaskRequest(request) => self
.delete_task(request.params, context)
.await
.map(ServerResult::CancelTaskResult),
.map(ServerResult::DeleteTaskResult),
};
// SEP-2164: peers negotiating 2026-07-28+ get the standard INVALID_PARAMS code for
// resource-not-found; older peers keep RESOURCE_NOT_FOUND. ISO `YYYY-MM-DD` versions
Expand DownExpand Up@@ -398,13 +398,13 @@ macro_rules! server_handler_methods {
std::future::ready(Err(McpError::method_not_found::<GetTaskResultMethod>()))
}

fn cancel_task(
fn delete_task(
&self,
request: CancelTaskParams,
request: DeleteTaskParams,
context: RequestContext<RoleServer>,
) -> impl Future<Output = Result<CancelTaskResult, McpError>> + MaybeSendFuture + '_ {
) -> impl Future<Output = Result<DeleteTaskResult, McpError>> + MaybeSendFuture + '_ {
let _ = (request, context);
std::future::ready(Err(McpError::method_not_found::<CancelTaskMethod>()))
std::future::ready(Err(McpError::method_not_found::<DeleteTaskMethod>()))
}
};
}
Expand DownExpand Up@@ -614,12 +614,12 @@ macro_rules! impl_server_handler_for_wrapper {
(**self).get_task_result(request, context)
}

fn cancel_task(
fn delete_task(
&self,
request: CancelTaskParams,
request: DeleteTaskParams,
context: RequestContext<RoleServer>,
) -> impl Future<Output = Result<CancelTaskResult, McpError>> + MaybeSendFuture + '_ {
(**self).cancel_task(request, context)
) -> impl Future<Output = Result<DeleteTaskResult, McpError>> + MaybeSendFuture + '_ {
(**self).delete_task(request, context)
}
}
};
Expand Down
42 changes: 31 additions & 11 deletions crates/rmcp/src/model.rs
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Original file line numberDiff line numberDiff line change
Expand Up@@ -3213,32 +3213,28 @@ impl RequestParamsMeta for GetTaskResultParams {
#[deprecated(since = "0.13.0", note = "Use GetTaskResultParams instead")]
pub type GetTaskResultParam = GetTaskResultParams;

const_string!(CancelTaskMethod = "tasks/cancel");
pub type CancelTaskRequest = Request<CancelTaskMethod, CancelTaskParams>;
const_string!(DeleteTaskMethod = "tasks/delete");
pub type DeleteTaskRequest = Request<DeleteTaskMethod, DeleteTaskParams>;

#[derive(Debug, Serialize, Deserialize, Clone, PartialEq)]
#[serde(rename_all = "camelCase")]
#[cfg_attr(feature = "schemars", derive(schemars::JsonSchema))]
#[expect(clippy::exhaustive_structs, reason = "intentionally exhaustive")]
pub struct CancelTaskParams {
pub struct DeleteTaskParams {
/// Protocol-level metadata for this request (SEP-1319)
#[serde(rename = "_meta", default, skip_serializing_if = "Option::is_none")]
pub meta: Option<Meta>,
pub task_id: String,
}

impl RequestParamsMeta for CancelTaskParams {
impl RequestParamsMeta for DeleteTaskParams {
fn meta(&self) -> Option<&Meta> {
self.meta.as_ref()
}
fn meta_mut(&mut self) -> &mut Option<Meta> {
&mut self.meta
}
}

/// Deprecated: Use [`CancelTaskParams`] instead (SEP-1319 compliance).
#[deprecated(since = "0.13.0", note = "Use CancelTaskParams instead")]
pub type CancelTaskParam = CancelTaskParams;
/// Deprecated: Use [`GetTaskResult`] instead (spec alignment).
#[deprecated(since = "0.15.0", note = "Use GetTaskResult instead")]
pub type GetTaskInfoResult = GetTaskResult;
Expand DownExpand Up@@ -3338,7 +3334,7 @@ ts_union!(
| GetTaskInfoRequest
| ListTasksRequest
| GetTaskResultRequest
| CancelTaskRequest
| DeleteTaskRequest
| CustomRequest;
);

Expand All@@ -3361,7 +3357,7 @@ impl ClientRequest {
ClientRequest::GetTaskInfoRequest(r) => r.method.as_str(),
ClientRequest::ListTasksRequest(r) => r.method.as_str(),
ClientRequest::GetTaskResultRequest(r) => r.method.as_str(),
ClientRequest::CancelTaskRequest(r) => r.method.as_str(),
ClientRequest::DeleteTaskRequest(r) => r.method.as_str(),
ClientRequest::CustomRequest(r) => r.method.as_str(),
}
}
Expand All@@ -3381,6 +3377,10 @@ ts_union!(
box CreateMessageResult
| ListRootsResult
| CreateElicitationResult
| ListTasksResult
| GetTaskResult
| GetTaskPayloadResult
| DeleteTaskResult
| EmptyResult
| CustomResult;
);
Expand All@@ -3399,9 +3399,29 @@ ts_union!(
| CreateMessageRequest
| ListRootsRequest
| CreateElicitationRequest
| GetTaskInfoRequest
| ListTasksRequest
| GetTaskResultRequest
| DeleteTaskRequest
| CustomRequest;
);

impl ServerRequest {
pub fn method(&self) -> &str {
match &self {
ServerRequest::PingRequest(r) => r.method.as_str(),
ServerRequest::CreateMessageRequest(r) => r.method.as_str(),
ServerRequest::ListRootsRequest(r) => r.method.as_str(),
ServerRequest::CreateElicitationRequest(r) => r.method.as_str(),
ServerRequest::GetTaskInfoRequest(r) => r.method.as_str(),
ServerRequest::ListTasksRequest(r) => r.method.as_str(),
ServerRequest::GetTaskResultRequest(r) => r.method.as_str(),
ServerRequest::DeleteTaskRequest(r) => r.method.as_str(),
ServerRequest::CustomRequest(r) => r.method.as_str(),
}
}
}

ts_union!(
export type ServerNotification =
| CancelledNotification
Expand DownExpand Up@@ -3429,7 +3449,7 @@ ts_union!(
| CreateTaskResult
| ListTasksResult
| GetTaskResult
| CancelTaskResult
| DeleteTaskResult
| CallToolResult
| GetTaskPayloadResult
| EmptyResult
Expand Down
6 changes: 5 additions & 1 deletion crates/rmcp/src/model/meta.rs
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Expand Up@@ -155,7 +155,7 @@ variant_extension! {
GetTaskInfoRequest
ListTasksRequest
GetTaskResultRequest
CancelTaskRequest
DeleteTaskRequest
}
}

Expand All@@ -166,6 +166,10 @@ variant_extension! {
ListRootsRequest
CreateElicitationRequest
CustomRequest
GetTaskInfoRequest
ListTasksRequest
GetTaskResultRequest
DeleteTaskRequest
}
}

Expand Down
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feat(task): route server-originated tasks/* to ClientHandler (SEP-1686)#816

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feat(task): route server-originated tasks/* to ClientHandler (SEP-1686)
#816
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726d182

feat(task): route server-originated tasks/* to ClientHandler (SEP-1686)


TheUnderdev Apr 20, 2026
62b4b40

fix(task): rename tasks/cancel to tasks/delete (SEP-1686 §3.6)


TheUnderdev May 13, 2026
0c4d5df

chore(task): regen golden schemas after rebase; relax semver enum lint


TheUnderdev Jun 23, 2026

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30 changes: 8 additions & 22 deletions
crates/rmcp-macros/src/task_handler.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -223,38 +223,24 @@ pub fn task_handler(attr: TokenStream, input: TokenStream) -> syn::Result<TokenS
 .push(syn::parse2::<ImplItem>(get_result_fn)?);
 }

 if !has_method("cancel_task", &item_impl) {
 let cancel_fn = quote! {
 async fn cancel_task(
 if !has_method("delete_task", &item_impl) {
 let delete_fn = quote! {
 async fn delete_task(
 &self,
 request: rmcp::model::CancelTaskParams,
 request: rmcp::model::DeleteTaskParams,
 _context: rmcp::service::RequestContext<rmcp::RoleServer>,
 ) -> Result<rmcp::model::CancelTaskResult, McpError> {
 use rmcp::task_manager::current_timestamp;
 ) -> Result<rmcp::model::DeleteTaskResult, McpError> {
 let task_id = request.task_id;
 let mut processor = (#processor).lock().await;

 if processor.cancel_task(&task_id) {
 let timestamp = current_timestamp();
 let task = rmcp::model::Task::new(
 task_id,
 rmcp::model::TaskStatus::Cancelled,
 timestamp.clone(),
 timestamp,
 );
 return Ok(rmcp::model::CancelTaskResult { meta: None, task });
 }

 // If already completed, signal it's not cancellable
 let exists_completed = processor.peek_completed().iter().any(|r| r.descriptor.operation_id == task_id);
 if exists_completed {
 return Err(McpError::invalid_request(format!("task already completed: {}", task_id), None));
 if processor.delete_task(&task_id) {
 return Ok(rmcp::model::DeleteTaskResult { meta: None });
 }

 Err(McpError::resource_not_found(format!("task not found: {}", task_id), None))
 }
 };
 item_impl.items.push(syn::parse2::<ImplItem>(cancel_fn)?);
 item_impl.items.push(syn::parse2::<ImplItem>(delete_fn)?);
 }

 // Auto-generate get_info() if not already provided and no sibling tool/prompt handler
Expand Down

15 changes: 15 additions & 0 deletions
crates/rmcp/Cargo.toml

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Original file line numberDiff line numberDiff line change
Expand Up@@ -42,6 +42,16 @@ features = [
]
rustdoc-args = ["--cfg", "docsrs"]

# The protocol message unions in `model.rs` (`ClientRequest`, `ServerRequest`,
# `ClientResult`, `ServerResult`, …) are generated by `ts_union!` and are
# intentionally `#[non_exhaustive]`-free (see the `clippy::exhaustive_enums`
# expectation on the macro): each new spec revision adds message variants.
# Adding a variant is non-breaking for downstream consumers — the enums are
# `#[serde(untagged)]` and gain `From` impls — so `enum_variant_added` is
# expected churn rather than a true semver break.
[package.metadata.cargo-semver-checks.lints]
enum_variant_added = "allow"

[dependencies]
async-trait = "0.1.89"
serde = { version = "1.0", features = ["derive", "rc"] }
Expand DownExpand Up@@ -293,6 +303,11 @@ name = "test_custom_request"
required-features = ["server", "client"]
path = "tests/test_custom_request.rs"

[[test]]
name = "test_task_client_receiver"
required-features = ["server", "client"]
path = "tests/test_task_client_receiver.rs"

[[test]]
name = "test_prompt_macros"
required-features = ["server", "client"]
Expand Down

110 changes: 110 additions & 0 deletions
crates/rmcp/src/handler/client.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -30,6 +30,22 @@ impl<H: ClientHandler> Service<RoleClient> for H {
 .create_elicitation(request.params, context)
 .await
 .map(ClientResult::CreateElicitationResult),
 ServerRequest::ListTasksRequest(request) => self
 .list_tasks(request.params, context)
 .await
 .map(ClientResult::ListTasksResult),
 ServerRequest::GetTaskInfoRequest(request) => self
 .get_task_info(request.params, context)
 .await
 .map(ClientResult::GetTaskResult),
 ServerRequest::GetTaskResultRequest(request) => self
 .get_task_result(request.params, context)
 .await
 .map(ClientResult::GetTaskPayloadResult),
 ServerRequest::DeleteTaskRequest(request) => self
 .delete_task(request.params, context)
 .await
 .map(ClientResult::DeleteTaskResult),
 ServerRequest::CustomRequest(request) => self
 .on_custom_request(request, context)
 .await
Expand DownExpand Up@@ -191,6 +207,68 @@ pub trait ClientHandler: Sized + Send + Sync + 'static {
 )))
 }

 /// Handle a `tasks/list` request from a server. Only relevant when the
 /// client is also a task *receiver* (e.g. it accepted a task-augmented
 /// `sampling/createMessage` or `elicitation/create` request).
 ///
 /// # Default Behavior
 /// Returns `-32601` (Method not found). Clients that advertise
 /// `capabilities.tasks.list` must override this.
 fn list_tasks(
 &self,
 request: Option<PaginatedRequestParams>,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<ListTasksResult, McpError>> + MaybeSendFuture + '_ {
 let _ = (request, context);
 std::future::ready(Err(McpError::method_not_found::<ListTasksMethod>()))
 }

 /// Handle a `tasks/get` request from a server. Only relevant when the
 /// client is also a task *receiver* (e.g. it accepted a task-augmented
 /// `sampling/createMessage` or `elicitation/create` request).
 ///
 /// # Default Behavior
 /// Returns `-32601` (Method not found). Clients that advertise
 /// `capabilities.tasks.requests.sampling.createMessage` or
 /// `capabilities.tasks.requests.elicitation.create` must override this.
 fn get_task_info(
 &self,
 request: GetTaskInfoParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<GetTaskResult, McpError>> + MaybeSendFuture + '_ {
 let _ = (request, context);
 std::future::ready(Err(McpError::method_not_found::<GetTaskInfoMethod>()))
 }

 /// Handle a `tasks/result` request from a server. Only relevant when
 /// the client is also a task *receiver*.
 ///
 /// # Default Behavior
 /// Returns `-32601` (Method not found).
 fn get_task_result(
 &self,
 request: GetTaskResultParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<GetTaskPayloadResult, McpError>> + MaybeSendFuture + '_ {
 let _ = (request, context);
 std::future::ready(Err(McpError::method_not_found::<GetTaskResultMethod>()))
 }

 /// Handle a `tasks/delete` request from a server (SEP-1686 §3.6).
 /// Only relevant when the client is also a task *receiver*.
 ///
 /// # Default Behavior
 /// Returns `-32601` (Method not found). Task receivers must override this
 /// to delete the task and any associated stored result.
 fn delete_task(
 &self,
 request: DeleteTaskParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<DeleteTaskResult, McpError>> + MaybeSendFuture + '_ {
 let _ = (request, context);
 std::future::ready(Err(McpError::method_not_found::<DeleteTaskMethod>()))
 }

 fn on_cancelled(
 &self,
 params: CancelledNotificationParam,
Expand DownExpand Up@@ -310,6 +388,38 @@ macro_rules! impl_client_handler_for_wrapper {
 (**self).on_custom_request(request, context)
 }

 fn list_tasks(
 &self,
 request: Option<PaginatedRequestParams>,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<ListTasksResult, McpError>> + MaybeSendFuture + '_ {
 (**self).list_tasks(request, context)
 }

 fn get_task_info(
 &self,
 request: GetTaskInfoParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<GetTaskResult, McpError>> + MaybeSendFuture + '_ {
 (**self).get_task_info(request, context)
 }

 fn get_task_result(
 &self,
 request: GetTaskResultParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<GetTaskPayloadResult, McpError>> + MaybeSendFuture + '_ {
 (**self).get_task_result(request, context)
 }

 fn delete_task(
 &self,
 request: DeleteTaskParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<DeleteTaskResult, McpError>> + MaybeSendFuture + '_ {
 (**self).delete_task(request, context)
 }

 fn on_cancelled(
 &self,
 params: CancelledNotificationParam,
Expand Down

22 changes: 11 additions & 11 deletions
crates/rmcp/src/handler/server.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -125,10 +125,10 @@ impl<H: ServerHandler> Service<RoleServer> for H {
 .get_task_result(request.params, context)
 .await
 .map(ServerResult::GetTaskPayloadResult),
 ClientRequest::CancelTaskRequest(request) => self
 .cancel_task(request.params, context)
 ClientRequest::DeleteTaskRequest(request) => self
 .delete_task(request.params, context)
 .await
 .map(ServerResult::CancelTaskResult),
 .map(ServerResult::DeleteTaskResult),
 };
 // SEP-2164: peers negotiating 2026-07-28+ get the standard INVALID_PARAMS code for
 // resource-not-found; older peers keep RESOURCE_NOT_FOUND. ISO `YYYY-MM-DD` versions
Expand DownExpand Up@@ -398,13 +398,13 @@ macro_rules! server_handler_methods {
 std::future::ready(Err(McpError::method_not_found::<GetTaskResultMethod>()))
 }

 fn cancel_task(
 fn delete_task(
 &self,
 request: CancelTaskParams,
 request: DeleteTaskParams,
 context: RequestContext<RoleServer>,
 ) -> impl Future<Output = Result<CancelTaskResult, McpError>> + MaybeSendFuture + '_ {
 ) -> impl Future<Output = Result<DeleteTaskResult, McpError>> + MaybeSendFuture + '_ {
 let _ = (request, context);
 std::future::ready(Err(McpError::method_not_found::<CancelTaskMethod>()))
 std::future::ready(Err(McpError::method_not_found::<DeleteTaskMethod>()))
 }
 };
}
Expand DownExpand Up@@ -614,12 +614,12 @@ macro_rules! impl_server_handler_for_wrapper {
 (**self).get_task_result(request, context)
 }

 fn cancel_task(
 fn delete_task(
 &self,
 request: CancelTaskParams,
 request: DeleteTaskParams,
 context: RequestContext<RoleServer>,
 ) -> impl Future<Output = Result<CancelTaskResult, McpError>> + MaybeSendFuture + '_ {
 (**self).cancel_task(request, context)
 ) -> impl Future<Output = Result<DeleteTaskResult, McpError>> + MaybeSendFuture + '_ {
 (**self).delete_task(request, context)
 }
 }
 };
Expand Down

42 changes: 31 additions & 11 deletions
crates/rmcp/src/model.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -3213,32 +3213,28 @@ impl RequestParamsMeta for GetTaskResultParams {
#[deprecated(since = "0.13.0", note = "Use GetTaskResultParams instead")]
pub type GetTaskResultParam = GetTaskResultParams;

const_string!(CancelTaskMethod = "tasks/cancel");
pub type CancelTaskRequest = Request<CancelTaskMethod, CancelTaskParams>;
const_string!(DeleteTaskMethod = "tasks/delete");
pub type DeleteTaskRequest = Request<DeleteTaskMethod, DeleteTaskParams>;

#[derive(Debug, Serialize, Deserialize, Clone, PartialEq)]
#[serde(rename_all = "camelCase")]
#[cfg_attr(feature = "schemars", derive(schemars::JsonSchema))]
#[expect(clippy::exhaustive_structs, reason = "intentionally exhaustive")]
pub struct CancelTaskParams {
pub struct DeleteTaskParams {
 /// Protocol-level metadata for this request (SEP-1319)
 #[serde(rename = "_meta", default, skip_serializing_if = "Option::is_none")]
 pub meta: Option<Meta>,
 pub task_id: String,
}

impl RequestParamsMeta for CancelTaskParams {
impl RequestParamsMeta for DeleteTaskParams {
 fn meta(&self) -> Option<&Meta> {
 self.meta.as_ref()
 }
 fn meta_mut(&mut self) -> &mut Option<Meta> {
 &mut self.meta
 }
}

/// Deprecated: Use [`CancelTaskParams`] instead (SEP-1319 compliance).
#[deprecated(since = "0.13.0", note = "Use CancelTaskParams instead")]
pub type CancelTaskParam = CancelTaskParams;
/// Deprecated: Use [`GetTaskResult`] instead (spec alignment).
#[deprecated(since = "0.15.0", note = "Use GetTaskResult instead")]
pub type GetTaskInfoResult = GetTaskResult;
Expand DownExpand Up@@ -3338,7 +3334,7 @@ ts_union!(
 | GetTaskInfoRequest
 | ListTasksRequest
 | GetTaskResultRequest
 | CancelTaskRequest
 | DeleteTaskRequest
 | CustomRequest;
);

Expand All@@ -3361,7 +3357,7 @@ impl ClientRequest {
 ClientRequest::GetTaskInfoRequest(r) => r.method.as_str(),
 ClientRequest::ListTasksRequest(r) => r.method.as_str(),
 ClientRequest::GetTaskResultRequest(r) => r.method.as_str(),
 ClientRequest::CancelTaskRequest(r) => r.method.as_str(),
 ClientRequest::DeleteTaskRequest(r) => r.method.as_str(),
 ClientRequest::CustomRequest(r) => r.method.as_str(),
 }
 }
Expand All@@ -3381,6 +3377,10 @@ ts_union!(
 box CreateMessageResult
 | ListRootsResult
 | CreateElicitationResult
 | ListTasksResult
 | GetTaskResult
 | GetTaskPayloadResult
 | DeleteTaskResult
 | EmptyResult
 | CustomResult;
);
Expand All@@ -3399,9 +3399,29 @@ ts_union!(
 | CreateMessageRequest
 | ListRootsRequest
 | CreateElicitationRequest
 | GetTaskInfoRequest
 | ListTasksRequest
 | GetTaskResultRequest
 | DeleteTaskRequest
 | CustomRequest;
);

impl ServerRequest {
 pub fn method(&self) -> &str {
 match &self {
 ServerRequest::PingRequest(r) => r.method.as_str(),
 ServerRequest::CreateMessageRequest(r) => r.method.as_str(),
 ServerRequest::ListRootsRequest(r) => r.method.as_str(),
 ServerRequest::CreateElicitationRequest(r) => r.method.as_str(),
 ServerRequest::GetTaskInfoRequest(r) => r.method.as_str(),
 ServerRequest::ListTasksRequest(r) => r.method.as_str(),
 ServerRequest::GetTaskResultRequest(r) => r.method.as_str(),
 ServerRequest::DeleteTaskRequest(r) => r.method.as_str(),
 ServerRequest::CustomRequest(r) => r.method.as_str(),
 }
 }
}

ts_union!(
 export type ServerNotification =
 | CancelledNotification
Expand DownExpand Up@@ -3429,7 +3449,7 @@ ts_union!(
 | CreateTaskResult
 | ListTasksResult
 | GetTaskResult
 | CancelTaskResult
 | DeleteTaskResult
 | CallToolResult
 | GetTaskPayloadResult
 | EmptyResult
Expand Down

6 changes: 5 additions & 1 deletion
crates/rmcp/src/model/meta.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -155,7 +155,7 @@ variant_extension! {
 GetTaskInfoRequest
 ListTasksRequest
 GetTaskResultRequest
CancelTaskRequest
DeleteTaskRequest
 }
}

Expand All@@ -166,6 +166,10 @@ variant_extension! {
 ListRootsRequest
 CreateElicitationRequest
 CustomRequest
 GetTaskInfoRequest
 ListTasksRequest
 GetTaskResultRequest
 DeleteTaskRequest
 }
}

Expand Down
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feat(task): route server-originated tasks/* to ClientHandler (SEP-1686)
#816
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726d182

feat(task): route server-originated tasks/* to ClientHandler (SEP-1686)


TheUnderdev Apr 20, 2026
62b4b40

fix(task): rename tasks/cancel to tasks/delete (SEP-1686 §3.6)


TheUnderdev May 13, 2026
0c4d5df

chore(task): regen golden schemas after rebase; relax semver enum lint


TheUnderdev Jun 23, 2026

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30 changes: 8 additions & 22 deletions
crates/rmcp-macros/src/task_handler.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -223,38 +223,24 @@ pub fn task_handler(attr: TokenStream, input: TokenStream) -> syn::Result<TokenS
 .push(syn::parse2::<ImplItem>(get_result_fn)?);
 }

 if !has_method("cancel_task", &item_impl) {
 let cancel_fn = quote! {
 async fn cancel_task(
 if !has_method("delete_task", &item_impl) {
 let delete_fn = quote! {
 async fn delete_task(
 &self,
 request: rmcp::model::CancelTaskParams,
 request: rmcp::model::DeleteTaskParams,
 _context: rmcp::service::RequestContext<rmcp::RoleServer>,
 ) -> Result<rmcp::model::CancelTaskResult, McpError> {
 use rmcp::task_manager::current_timestamp;
 ) -> Result<rmcp::model::DeleteTaskResult, McpError> {
 let task_id = request.task_id;
 let mut processor = (#processor).lock().await;

 if processor.cancel_task(&task_id) {
 let timestamp = current_timestamp();
 let task = rmcp::model::Task::new(
 task_id,
 rmcp::model::TaskStatus::Cancelled,
 timestamp.clone(),
 timestamp,
 );
 return Ok(rmcp::model::CancelTaskResult { meta: None, task });
 }

 // If already completed, signal it's not cancellable
 let exists_completed = processor.peek_completed().iter().any(|r| r.descriptor.operation_id == task_id);
 if exists_completed {
 return Err(McpError::invalid_request(format!("task already completed: {}", task_id), None));
 if processor.delete_task(&task_id) {
 return Ok(rmcp::model::DeleteTaskResult { meta: None });
 }

 Err(McpError::resource_not_found(format!("task not found: {}", task_id), None))
 }
 };
 item_impl.items.push(syn::parse2::<ImplItem>(cancel_fn)?);
 item_impl.items.push(syn::parse2::<ImplItem>(delete_fn)?);
 }

 // Auto-generate get_info() if not already provided and no sibling tool/prompt handler
Expand Down

15 changes: 15 additions & 0 deletions
crates/rmcp/Cargo.toml

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Original file line numberDiff line numberDiff line change
Expand Up@@ -42,6 +42,16 @@ features = [
]
rustdoc-args = ["--cfg", "docsrs"]

# The protocol message unions in `model.rs` (`ClientRequest`, `ServerRequest`,
# `ClientResult`, `ServerResult`, …) are generated by `ts_union!` and are
# intentionally `#[non_exhaustive]`-free (see the `clippy::exhaustive_enums`
# expectation on the macro): each new spec revision adds message variants.
# Adding a variant is non-breaking for downstream consumers — the enums are
# `#[serde(untagged)]` and gain `From` impls — so `enum_variant_added` is
# expected churn rather than a true semver break.
[package.metadata.cargo-semver-checks.lints]
enum_variant_added = "allow"

[dependencies]
async-trait = "0.1.89"
serde = { version = "1.0", features = ["derive", "rc"] }
Expand DownExpand Up@@ -293,6 +303,11 @@ name = "test_custom_request"
required-features = ["server", "client"]
path = "tests/test_custom_request.rs"

[[test]]
name = "test_task_client_receiver"
required-features = ["server", "client"]
path = "tests/test_task_client_receiver.rs"

[[test]]
name = "test_prompt_macros"
required-features = ["server", "client"]
Expand Down

110 changes: 110 additions & 0 deletions
crates/rmcp/src/handler/client.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -30,6 +30,22 @@ impl<H: ClientHandler> Service<RoleClient> for H {
 .create_elicitation(request.params, context)
 .await
 .map(ClientResult::CreateElicitationResult),
 ServerRequest::ListTasksRequest(request) => self
 .list_tasks(request.params, context)
 .await
 .map(ClientResult::ListTasksResult),
 ServerRequest::GetTaskInfoRequest(request) => self
 .get_task_info(request.params, context)
 .await
 .map(ClientResult::GetTaskResult),
 ServerRequest::GetTaskResultRequest(request) => self
 .get_task_result(request.params, context)
 .await
 .map(ClientResult::GetTaskPayloadResult),
 ServerRequest::DeleteTaskRequest(request) => self
 .delete_task(request.params, context)
 .await
 .map(ClientResult::DeleteTaskResult),
 ServerRequest::CustomRequest(request) => self
 .on_custom_request(request, context)
 .await
Expand DownExpand Up@@ -191,6 +207,68 @@ pub trait ClientHandler: Sized + Send + Sync + 'static {
 )))
 }

 /// Handle a `tasks/list` request from a server. Only relevant when the
 /// client is also a task *receiver* (e.g. it accepted a task-augmented
 /// `sampling/createMessage` or `elicitation/create` request).
 ///
 /// # Default Behavior
 /// Returns `-32601` (Method not found). Clients that advertise
 /// `capabilities.tasks.list` must override this.
 fn list_tasks(
 &self,
 request: Option<PaginatedRequestParams>,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<ListTasksResult, McpError>> + MaybeSendFuture + '_ {
 let _ = (request, context);
 std::future::ready(Err(McpError::method_not_found::<ListTasksMethod>()))
 }

 /// Handle a `tasks/get` request from a server. Only relevant when the
 /// client is also a task *receiver* (e.g. it accepted a task-augmented
 /// `sampling/createMessage` or `elicitation/create` request).
 ///
 /// # Default Behavior
 /// Returns `-32601` (Method not found). Clients that advertise
 /// `capabilities.tasks.requests.sampling.createMessage` or
 /// `capabilities.tasks.requests.elicitation.create` must override this.
 fn get_task_info(
 &self,
 request: GetTaskInfoParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<GetTaskResult, McpError>> + MaybeSendFuture + '_ {
 let _ = (request, context);
 std::future::ready(Err(McpError::method_not_found::<GetTaskInfoMethod>()))
 }

 /// Handle a `tasks/result` request from a server. Only relevant when
 /// the client is also a task *receiver*.
 ///
 /// # Default Behavior
 /// Returns `-32601` (Method not found).
 fn get_task_result(
 &self,
 request: GetTaskResultParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<GetTaskPayloadResult, McpError>> + MaybeSendFuture + '_ {
 let _ = (request, context);
 std::future::ready(Err(McpError::method_not_found::<GetTaskResultMethod>()))
 }

 /// Handle a `tasks/delete` request from a server (SEP-1686 §3.6).
 /// Only relevant when the client is also a task *receiver*.
 ///
 /// # Default Behavior
 /// Returns `-32601` (Method not found). Task receivers must override this
 /// to delete the task and any associated stored result.
 fn delete_task(
 &self,
 request: DeleteTaskParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<DeleteTaskResult, McpError>> + MaybeSendFuture + '_ {
 let _ = (request, context);
 std::future::ready(Err(McpError::method_not_found::<DeleteTaskMethod>()))
 }

 fn on_cancelled(
 &self,
 params: CancelledNotificationParam,
Expand DownExpand Up@@ -310,6 +388,38 @@ macro_rules! impl_client_handler_for_wrapper {
 (**self).on_custom_request(request, context)
 }

 fn list_tasks(
 &self,
 request: Option<PaginatedRequestParams>,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<ListTasksResult, McpError>> + MaybeSendFuture + '_ {
 (**self).list_tasks(request, context)
 }

 fn get_task_info(
 &self,
 request: GetTaskInfoParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<GetTaskResult, McpError>> + MaybeSendFuture + '_ {
 (**self).get_task_info(request, context)
 }

 fn get_task_result(
 &self,
 request: GetTaskResultParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<GetTaskPayloadResult, McpError>> + MaybeSendFuture + '_ {
 (**self).get_task_result(request, context)
 }

 fn delete_task(
 &self,
 request: DeleteTaskParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<DeleteTaskResult, McpError>> + MaybeSendFuture + '_ {
 (**self).delete_task(request, context)
 }

 fn on_cancelled(
 &self,
 params: CancelledNotificationParam,
Expand Down

22 changes: 11 additions & 11 deletions
crates/rmcp/src/handler/server.rs

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -125,10 +125,10 @@ impl<H: ServerHandler> Service<RoleServer> for H {
 .get_task_result(request.params, context)
 .await
 .map(ServerResult::GetTaskPayloadResult),
 ClientRequest::CancelTaskRequest(request) => self
 .cancel_task(request.params, context)
 ClientRequest::DeleteTaskRequest(request) => self
 .delete_task(request.params, context)
 .await
 .map(ServerResult::CancelTaskResult),
 .map(ServerResult::DeleteTaskResult),
 };
 // SEP-2164: peers negotiating 2026-07-28+ get the standard INVALID_PARAMS code for
 // resource-not-found; older peers keep RESOURCE_NOT_FOUND. ISO `YYYY-MM-DD` versions
Expand DownExpand Up@@ -398,13 +398,13 @@ macro_rules! server_handler_methods {
 std::future::ready(Err(McpError::method_not_found::<GetTaskResultMethod>()))
 }

 fn cancel_task(
 fn delete_task(
 &self,
 request: CancelTaskParams,
 request: DeleteTaskParams,
 context: RequestContext<RoleServer>,
 ) -> impl Future<Output = Result<CancelTaskResult, McpError>> + MaybeSendFuture + '_ {
 ) -> impl Future<Output = Result<DeleteTaskResult, McpError>> + MaybeSendFuture + '_ {
 let _ = (request, context);
 std::future::ready(Err(McpError::method_not_found::<CancelTaskMethod>()))
 std::future::ready(Err(McpError::method_not_found::<DeleteTaskMethod>()))
 }
 };
}
Expand DownExpand Up@@ -614,12 +614,12 @@ macro_rules! impl_server_handler_for_wrapper {
 (**self).get_task_result(request, context)
 }

 fn cancel_task(
 fn delete_task(
 &self,
 request: CancelTaskParams,
 request: DeleteTaskParams,
 context: RequestContext<RoleServer>,
 ) -> impl Future<Output = Result<CancelTaskResult, McpError>> + MaybeSendFuture + '_ {
 (**self).cancel_task(request, context)
 ) -> impl Future<Output = Result<DeleteTaskResult, McpError>> + MaybeSendFuture + '_ {
 (**self).delete_task(request, context)
 }
 }
 };
Expand Down

42 changes: 31 additions & 11 deletions
crates/rmcp/src/model.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -3213,32 +3213,28 @@ impl RequestParamsMeta for GetTaskResultParams {
#[deprecated(since = "0.13.0", note = "Use GetTaskResultParams instead")]
pub type GetTaskResultParam = GetTaskResultParams;

const_string!(CancelTaskMethod = "tasks/cancel");
pub type CancelTaskRequest = Request<CancelTaskMethod, CancelTaskParams>;
const_string!(DeleteTaskMethod = "tasks/delete");
pub type DeleteTaskRequest = Request<DeleteTaskMethod, DeleteTaskParams>;

#[derive(Debug, Serialize, Deserialize, Clone, PartialEq)]
#[serde(rename_all = "camelCase")]
#[cfg_attr(feature = "schemars", derive(schemars::JsonSchema))]
#[expect(clippy::exhaustive_structs, reason = "intentionally exhaustive")]
pub struct CancelTaskParams {
pub struct DeleteTaskParams {
 /// Protocol-level metadata for this request (SEP-1319)
 #[serde(rename = "_meta", default, skip_serializing_if = "Option::is_none")]
 pub meta: Option<Meta>,
 pub task_id: String,
}

impl RequestParamsMeta for CancelTaskParams {
impl RequestParamsMeta for DeleteTaskParams {
 fn meta(&self) -> Option<&Meta> {
 self.meta.as_ref()
 }
 fn meta_mut(&mut self) -> &mut Option<Meta> {
 &mut self.meta
 }
}

/// Deprecated: Use [`CancelTaskParams`] instead (SEP-1319 compliance).
#[deprecated(since = "0.13.0", note = "Use CancelTaskParams instead")]
pub type CancelTaskParam = CancelTaskParams;
/// Deprecated: Use [`GetTaskResult`] instead (spec alignment).
#[deprecated(since = "0.15.0", note = "Use GetTaskResult instead")]
pub type GetTaskInfoResult = GetTaskResult;
Expand DownExpand Up@@ -3338,7 +3334,7 @@ ts_union!(
 | GetTaskInfoRequest
 | ListTasksRequest
 | GetTaskResultRequest
 | CancelTaskRequest
 | DeleteTaskRequest
 | CustomRequest;
);

Expand All@@ -3361,7 +3357,7 @@ impl ClientRequest {
 ClientRequest::GetTaskInfoRequest(r) => r.method.as_str(),
 ClientRequest::ListTasksRequest(r) => r.method.as_str(),
 ClientRequest::GetTaskResultRequest(r) => r.method.as_str(),
 ClientRequest::CancelTaskRequest(r) => r.method.as_str(),
 ClientRequest::DeleteTaskRequest(r) => r.method.as_str(),
 ClientRequest::CustomRequest(r) => r.method.as_str(),
 }
 }
Expand All@@ -3381,6 +3377,10 @@ ts_union!(
 box CreateMessageResult
 | ListRootsResult
 | CreateElicitationResult
 | ListTasksResult
 | GetTaskResult
 | GetTaskPayloadResult
 | DeleteTaskResult
 | EmptyResult
 | CustomResult;
);
Expand All@@ -3399,9 +3399,29 @@ ts_union!(
 | CreateMessageRequest
 | ListRootsRequest
 | CreateElicitationRequest
 | GetTaskInfoRequest
 | ListTasksRequest
 | GetTaskResultRequest
 | DeleteTaskRequest
 | CustomRequest;
);

impl ServerRequest {
 pub fn method(&self) -> &str {
 match &self {
 ServerRequest::PingRequest(r) => r.method.as_str(),
 ServerRequest::CreateMessageRequest(r) => r.method.as_str(),
 ServerRequest::ListRootsRequest(r) => r.method.as_str(),
 ServerRequest::CreateElicitationRequest(r) => r.method.as_str(),
 ServerRequest::GetTaskInfoRequest(r) => r.method.as_str(),
 ServerRequest::ListTasksRequest(r) => r.method.as_str(),
 ServerRequest::GetTaskResultRequest(r) => r.method.as_str(),
 ServerRequest::DeleteTaskRequest(r) => r.method.as_str(),
 ServerRequest::CustomRequest(r) => r.method.as_str(),
 }
 }
}

ts_union!(
 export type ServerNotification =
 | CancelledNotification
Expand DownExpand Up@@ -3429,7 +3449,7 @@ ts_union!(
 | CreateTaskResult
 | ListTasksResult
 | GetTaskResult
 | CancelTaskResult
 | DeleteTaskResult
 | CallToolResult
 | GetTaskPayloadResult
 | EmptyResult
Expand Down

6 changes: 5 additions & 1 deletion
crates/rmcp/src/model/meta.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -155,7 +155,7 @@ variant_extension! {
 GetTaskInfoRequest
 ListTasksRequest
 GetTaskResultRequest
CancelTaskRequest
DeleteTaskRequest
 }
}

Expand All@@ -166,6 +166,10 @@ variant_extension! {
 ListRootsRequest
 CreateElicitationRequest
 CustomRequest
 GetTaskInfoRequest
 ListTasksRequest
 GetTaskResultRequest
 DeleteTaskRequest
 }
}

Expand Down
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feat(task): route server-originated tasks/* to ClientHandler (SEP-1686)
#816
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726d182

feat(task): route server-originated tasks/* to ClientHandler (SEP-1686)


TheUnderdev Apr 20, 2026
62b4b40

fix(task): rename tasks/cancel to tasks/delete (SEP-1686 §3.6)


TheUnderdev May 13, 2026
0c4d5df

chore(task): regen golden schemas after rebase; relax semver enum lint


TheUnderdev Jun 23, 2026

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30 changes: 8 additions & 22 deletions
crates/rmcp-macros/src/task_handler.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -223,38 +223,24 @@ pub fn task_handler(attr: TokenStream, input: TokenStream) -> syn::Result<TokenS
 .push(syn::parse2::<ImplItem>(get_result_fn)?);
 }

 if !has_method("cancel_task", &item_impl) {
 let cancel_fn = quote! {
 async fn cancel_task(
 if !has_method("delete_task", &item_impl) {
 let delete_fn = quote! {
 async fn delete_task(
 &self,
 request: rmcp::model::CancelTaskParams,
 request: rmcp::model::DeleteTaskParams,
 _context: rmcp::service::RequestContext<rmcp::RoleServer>,
 ) -> Result<rmcp::model::CancelTaskResult, McpError> {
 use rmcp::task_manager::current_timestamp;
 ) -> Result<rmcp::model::DeleteTaskResult, McpError> {
 let task_id = request.task_id;
 let mut processor = (#processor).lock().await;

 if processor.cancel_task(&task_id) {
 let timestamp = current_timestamp();
 let task = rmcp::model::Task::new(
 task_id,
 rmcp::model::TaskStatus::Cancelled,
 timestamp.clone(),
 timestamp,
 );
 return Ok(rmcp::model::CancelTaskResult { meta: None, task });
 }

 // If already completed, signal it's not cancellable
 let exists_completed = processor.peek_completed().iter().any(|r| r.descriptor.operation_id == task_id);
 if exists_completed {
 return Err(McpError::invalid_request(format!("task already completed: {}", task_id), None));
 if processor.delete_task(&task_id) {
 return Ok(rmcp::model::DeleteTaskResult { meta: None });
 }

 Err(McpError::resource_not_found(format!("task not found: {}", task_id), None))
 }
 };
 item_impl.items.push(syn::parse2::<ImplItem>(cancel_fn)?);
 item_impl.items.push(syn::parse2::<ImplItem>(delete_fn)?);
 }

 // Auto-generate get_info() if not already provided and no sibling tool/prompt handler
Expand Down

15 changes: 15 additions & 0 deletions
crates/rmcp/Cargo.toml

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Original file line numberDiff line numberDiff line change
Expand Up@@ -42,6 +42,16 @@ features = [
]
rustdoc-args = ["--cfg", "docsrs"]

# The protocol message unions in `model.rs` (`ClientRequest`, `ServerRequest`,
# `ClientResult`, `ServerResult`, …) are generated by `ts_union!` and are
# intentionally `#[non_exhaustive]`-free (see the `clippy::exhaustive_enums`
# expectation on the macro): each new spec revision adds message variants.
# Adding a variant is non-breaking for downstream consumers — the enums are
# `#[serde(untagged)]` and gain `From` impls — so `enum_variant_added` is
# expected churn rather than a true semver break.
[package.metadata.cargo-semver-checks.lints]
enum_variant_added = "allow"

[dependencies]
async-trait = "0.1.89"
serde = { version = "1.0", features = ["derive", "rc"] }
Expand DownExpand Up@@ -293,6 +303,11 @@ name = "test_custom_request"
required-features = ["server", "client"]
path = "tests/test_custom_request.rs"

[[test]]
name = "test_task_client_receiver"
required-features = ["server", "client"]
path = "tests/test_task_client_receiver.rs"

[[test]]
name = "test_prompt_macros"
required-features = ["server", "client"]
Expand Down

110 changes: 110 additions & 0 deletions
crates/rmcp/src/handler/client.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -30,6 +30,22 @@ impl<H: ClientHandler> Service<RoleClient> for H {
 .create_elicitation(request.params, context)
 .await
 .map(ClientResult::CreateElicitationResult),
 ServerRequest::ListTasksRequest(request) => self
 .list_tasks(request.params, context)
 .await
 .map(ClientResult::ListTasksResult),
 ServerRequest::GetTaskInfoRequest(request) => self
 .get_task_info(request.params, context)
 .await
 .map(ClientResult::GetTaskResult),
 ServerRequest::GetTaskResultRequest(request) => self
 .get_task_result(request.params, context)
 .await
 .map(ClientResult::GetTaskPayloadResult),
 ServerRequest::DeleteTaskRequest(request) => self
 .delete_task(request.params, context)
 .await
 .map(ClientResult::DeleteTaskResult),
 ServerRequest::CustomRequest(request) => self
 .on_custom_request(request, context)
 .await
Expand DownExpand Up@@ -191,6 +207,68 @@ pub trait ClientHandler: Sized + Send + Sync + 'static {
 )))
 }

 /// Handle a `tasks/list` request from a server. Only relevant when the
 /// client is also a task *receiver* (e.g. it accepted a task-augmented
 /// `sampling/createMessage` or `elicitation/create` request).
 ///
 /// # Default Behavior
 /// Returns `-32601` (Method not found). Clients that advertise
 /// `capabilities.tasks.list` must override this.
 fn list_tasks(
 &self,
 request: Option<PaginatedRequestParams>,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<ListTasksResult, McpError>> + MaybeSendFuture + '_ {
 let _ = (request, context);
 std::future::ready(Err(McpError::method_not_found::<ListTasksMethod>()))
 }

 /// Handle a `tasks/get` request from a server. Only relevant when the
 /// client is also a task *receiver* (e.g. it accepted a task-augmented
 /// `sampling/createMessage` or `elicitation/create` request).
 ///
 /// # Default Behavior
 /// Returns `-32601` (Method not found). Clients that advertise
 /// `capabilities.tasks.requests.sampling.createMessage` or
 /// `capabilities.tasks.requests.elicitation.create` must override this.
 fn get_task_info(
 &self,
 request: GetTaskInfoParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<GetTaskResult, McpError>> + MaybeSendFuture + '_ {
 let _ = (request, context);
 std::future::ready(Err(McpError::method_not_found::<GetTaskInfoMethod>()))
 }

 /// Handle a `tasks/result` request from a server. Only relevant when
 /// the client is also a task *receiver*.
 ///
 /// # Default Behavior
 /// Returns `-32601` (Method not found).
 fn get_task_result(
 &self,
 request: GetTaskResultParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<GetTaskPayloadResult, McpError>> + MaybeSendFuture + '_ {
 let _ = (request, context);
 std::future::ready(Err(McpError::method_not_found::<GetTaskResultMethod>()))
 }

 /// Handle a `tasks/delete` request from a server (SEP-1686 §3.6).
 /// Only relevant when the client is also a task *receiver*.
 ///
 /// # Default Behavior
 /// Returns `-32601` (Method not found). Task receivers must override this
 /// to delete the task and any associated stored result.
 fn delete_task(
 &self,
 request: DeleteTaskParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<DeleteTaskResult, McpError>> + MaybeSendFuture + '_ {
 let _ = (request, context);
 std::future::ready(Err(McpError::method_not_found::<DeleteTaskMethod>()))
 }

 fn on_cancelled(
 &self,
 params: CancelledNotificationParam,
Expand DownExpand Up@@ -310,6 +388,38 @@ macro_rules! impl_client_handler_for_wrapper {
 (**self).on_custom_request(request, context)
 }

 fn list_tasks(
 &self,
 request: Option<PaginatedRequestParams>,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<ListTasksResult, McpError>> + MaybeSendFuture + '_ {
 (**self).list_tasks(request, context)
 }

 fn get_task_info(
 &self,
 request: GetTaskInfoParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<GetTaskResult, McpError>> + MaybeSendFuture + '_ {
 (**self).get_task_info(request, context)
 }

 fn get_task_result(
 &self,
 request: GetTaskResultParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<GetTaskPayloadResult, McpError>> + MaybeSendFuture + '_ {
 (**self).get_task_result(request, context)
 }

 fn delete_task(
 &self,
 request: DeleteTaskParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<DeleteTaskResult, McpError>> + MaybeSendFuture + '_ {
 (**self).delete_task(request, context)
 }

 fn on_cancelled(
 &self,
 params: CancelledNotificationParam,
Expand Down

22 changes: 11 additions & 11 deletions
crates/rmcp/src/handler/server.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -125,10 +125,10 @@ impl<H: ServerHandler> Service<RoleServer> for H {
 .get_task_result(request.params, context)
 .await
 .map(ServerResult::GetTaskPayloadResult),
 ClientRequest::CancelTaskRequest(request) => self
 .cancel_task(request.params, context)
 ClientRequest::DeleteTaskRequest(request) => self
 .delete_task(request.params, context)
 .await
 .map(ServerResult::CancelTaskResult),
 .map(ServerResult::DeleteTaskResult),
 };
 // SEP-2164: peers negotiating 2026-07-28+ get the standard INVALID_PARAMS code for
 // resource-not-found; older peers keep RESOURCE_NOT_FOUND. ISO `YYYY-MM-DD` versions
Expand DownExpand Up@@ -398,13 +398,13 @@ macro_rules! server_handler_methods {
 std::future::ready(Err(McpError::method_not_found::<GetTaskResultMethod>()))
 }

 fn cancel_task(
 fn delete_task(
 &self,
 request: CancelTaskParams,
 request: DeleteTaskParams,
 context: RequestContext<RoleServer>,
 ) -> impl Future<Output = Result<CancelTaskResult, McpError>> + MaybeSendFuture + '_ {
 ) -> impl Future<Output = Result<DeleteTaskResult, McpError>> + MaybeSendFuture + '_ {
 let _ = (request, context);
 std::future::ready(Err(McpError::method_not_found::<CancelTaskMethod>()))
 std::future::ready(Err(McpError::method_not_found::<DeleteTaskMethod>()))
 }
 };
}
Expand DownExpand Up@@ -614,12 +614,12 @@ macro_rules! impl_server_handler_for_wrapper {
 (**self).get_task_result(request, context)
 }

 fn cancel_task(
 fn delete_task(
 &self,
 request: CancelTaskParams,
 request: DeleteTaskParams,
 context: RequestContext<RoleServer>,
 ) -> impl Future<Output = Result<CancelTaskResult, McpError>> + MaybeSendFuture + '_ {
 (**self).cancel_task(request, context)
 ) -> impl Future<Output = Result<DeleteTaskResult, McpError>> + MaybeSendFuture + '_ {
 (**self).delete_task(request, context)
 }
 }
 };
Expand Down

42 changes: 31 additions & 11 deletions
crates/rmcp/src/model.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -3213,32 +3213,28 @@ impl RequestParamsMeta for GetTaskResultParams {
#[deprecated(since = "0.13.0", note = "Use GetTaskResultParams instead")]
pub type GetTaskResultParam = GetTaskResultParams;

const_string!(CancelTaskMethod = "tasks/cancel");
pub type CancelTaskRequest = Request<CancelTaskMethod, CancelTaskParams>;
const_string!(DeleteTaskMethod = "tasks/delete");
pub type DeleteTaskRequest = Request<DeleteTaskMethod, DeleteTaskParams>;

#[derive(Debug, Serialize, Deserialize, Clone, PartialEq)]
#[serde(rename_all = "camelCase")]
#[cfg_attr(feature = "schemars", derive(schemars::JsonSchema))]
#[expect(clippy::exhaustive_structs, reason = "intentionally exhaustive")]
pub struct CancelTaskParams {
pub struct DeleteTaskParams {
 /// Protocol-level metadata for this request (SEP-1319)
 #[serde(rename = "_meta", default, skip_serializing_if = "Option::is_none")]
 pub meta: Option<Meta>,
 pub task_id: String,
}

impl RequestParamsMeta for CancelTaskParams {
impl RequestParamsMeta for DeleteTaskParams {
 fn meta(&self) -> Option<&Meta> {
 self.meta.as_ref()
 }
 fn meta_mut(&mut self) -> &mut Option<Meta> {
 &mut self.meta
 }
}

/// Deprecated: Use [`CancelTaskParams`] instead (SEP-1319 compliance).
#[deprecated(since = "0.13.0", note = "Use CancelTaskParams instead")]
pub type CancelTaskParam = CancelTaskParams;
/// Deprecated: Use [`GetTaskResult`] instead (spec alignment).
#[deprecated(since = "0.15.0", note = "Use GetTaskResult instead")]
pub type GetTaskInfoResult = GetTaskResult;
Expand DownExpand Up@@ -3338,7 +3334,7 @@ ts_union!(
 | GetTaskInfoRequest
 | ListTasksRequest
 | GetTaskResultRequest
 | CancelTaskRequest
 | DeleteTaskRequest
 | CustomRequest;
);

Expand All@@ -3361,7 +3357,7 @@ impl ClientRequest {
 ClientRequest::GetTaskInfoRequest(r) => r.method.as_str(),
 ClientRequest::ListTasksRequest(r) => r.method.as_str(),
 ClientRequest::GetTaskResultRequest(r) => r.method.as_str(),
 ClientRequest::CancelTaskRequest(r) => r.method.as_str(),
 ClientRequest::DeleteTaskRequest(r) => r.method.as_str(),
 ClientRequest::CustomRequest(r) => r.method.as_str(),
 }
 }
Expand All@@ -3381,6 +3377,10 @@ ts_union!(
 box CreateMessageResult
 | ListRootsResult
 | CreateElicitationResult
 | ListTasksResult
 | GetTaskResult
 | GetTaskPayloadResult
 | DeleteTaskResult
 | EmptyResult
 | CustomResult;
);
Expand All@@ -3399,9 +3399,29 @@ ts_union!(
 | CreateMessageRequest
 | ListRootsRequest
 | CreateElicitationRequest
 | GetTaskInfoRequest
 | ListTasksRequest
 | GetTaskResultRequest
 | DeleteTaskRequest
 | CustomRequest;
);

impl ServerRequest {
 pub fn method(&self) -> &str {
 match &self {
 ServerRequest::PingRequest(r) => r.method.as_str(),
 ServerRequest::CreateMessageRequest(r) => r.method.as_str(),
 ServerRequest::ListRootsRequest(r) => r.method.as_str(),
 ServerRequest::CreateElicitationRequest(r) => r.method.as_str(),
 ServerRequest::GetTaskInfoRequest(r) => r.method.as_str(),
 ServerRequest::ListTasksRequest(r) => r.method.as_str(),
 ServerRequest::GetTaskResultRequest(r) => r.method.as_str(),
 ServerRequest::DeleteTaskRequest(r) => r.method.as_str(),
 ServerRequest::CustomRequest(r) => r.method.as_str(),
 }
 }
}

ts_union!(
 export type ServerNotification =
 | CancelledNotification
Expand DownExpand Up@@ -3429,7 +3449,7 @@ ts_union!(
 | CreateTaskResult
 | ListTasksResult
 | GetTaskResult
 | CancelTaskResult
 | DeleteTaskResult
 | CallToolResult
 | GetTaskPayloadResult
 | EmptyResult
Expand Down

6 changes: 5 additions & 1 deletion
crates/rmcp/src/model/meta.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -155,7 +155,7 @@ variant_extension! {
 GetTaskInfoRequest
 ListTasksRequest
 GetTaskResultRequest
CancelTaskRequest
DeleteTaskRequest
 }
}

Expand All@@ -166,6 +166,10 @@ variant_extension! {
 ListRootsRequest
 CreateElicitationRequest
 CustomRequest
 GetTaskInfoRequest
 ListTasksRequest
 GetTaskResultRequest
 DeleteTaskRequest
 }
}

Expand Down
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if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
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if (node.tagName === 'A') cleanLinks();
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var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
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observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
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var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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feat(task): route server-originated tasks/* to ClientHandler (SEP-1686)#816

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feat(task): route server-originated tasks/* to ClientHandler (SEP-1686)
#816
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726d182

feat(task): route server-originated tasks/* to ClientHandler (SEP-1686)


TheUnderdev Apr 20, 2026
62b4b40

fix(task): rename tasks/cancel to tasks/delete (SEP-1686 §3.6)


TheUnderdev May 13, 2026
0c4d5df

chore(task): regen golden schemas after rebase; relax semver enum lint


TheUnderdev Jun 23, 2026

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30 changes: 8 additions & 22 deletions
crates/rmcp-macros/src/task_handler.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -223,38 +223,24 @@ pub fn task_handler(attr: TokenStream, input: TokenStream) -> syn::Result<TokenS
 .push(syn::parse2::<ImplItem>(get_result_fn)?);
 }

 if !has_method("cancel_task", &item_impl) {
 let cancel_fn = quote! {
 async fn cancel_task(
 if !has_method("delete_task", &item_impl) {
 let delete_fn = quote! {
 async fn delete_task(
 &self,
 request: rmcp::model::CancelTaskParams,
 request: rmcp::model::DeleteTaskParams,
 _context: rmcp::service::RequestContext<rmcp::RoleServer>,
 ) -> Result<rmcp::model::CancelTaskResult, McpError> {
 use rmcp::task_manager::current_timestamp;
 ) -> Result<rmcp::model::DeleteTaskResult, McpError> {
 let task_id = request.task_id;
 let mut processor = (#processor).lock().await;

 if processor.cancel_task(&task_id) {
 let timestamp = current_timestamp();
 let task = rmcp::model::Task::new(
 task_id,
 rmcp::model::TaskStatus::Cancelled,
 timestamp.clone(),
 timestamp,
 );
 return Ok(rmcp::model::CancelTaskResult { meta: None, task });
 }

 // If already completed, signal it's not cancellable
 let exists_completed = processor.peek_completed().iter().any(|r| r.descriptor.operation_id == task_id);
 if exists_completed {
 return Err(McpError::invalid_request(format!("task already completed: {}", task_id), None));
 if processor.delete_task(&task_id) {
 return Ok(rmcp::model::DeleteTaskResult { meta: None });
 }

 Err(McpError::resource_not_found(format!("task not found: {}", task_id), None))
 }
 };
 item_impl.items.push(syn::parse2::<ImplItem>(cancel_fn)?);
 item_impl.items.push(syn::parse2::<ImplItem>(delete_fn)?);
 }

 // Auto-generate get_info() if not already provided and no sibling tool/prompt handler
Expand Down

15 changes: 15 additions & 0 deletions
crates/rmcp/Cargo.toml

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Original file line numberDiff line numberDiff line change
Expand Up@@ -42,6 +42,16 @@ features = [
]
rustdoc-args = ["--cfg", "docsrs"]

# The protocol message unions in `model.rs` (`ClientRequest`, `ServerRequest`,
# `ClientResult`, `ServerResult`, …) are generated by `ts_union!` and are
# intentionally `#[non_exhaustive]`-free (see the `clippy::exhaustive_enums`
# expectation on the macro): each new spec revision adds message variants.
# Adding a variant is non-breaking for downstream consumers — the enums are
# `#[serde(untagged)]` and gain `From` impls — so `enum_variant_added` is
# expected churn rather than a true semver break.
[package.metadata.cargo-semver-checks.lints]
enum_variant_added = "allow"

[dependencies]
async-trait = "0.1.89"
serde = { version = "1.0", features = ["derive", "rc"] }
Expand DownExpand Up@@ -293,6 +303,11 @@ name = "test_custom_request"
required-features = ["server", "client"]
path = "tests/test_custom_request.rs"

[[test]]
name = "test_task_client_receiver"
required-features = ["server", "client"]
path = "tests/test_task_client_receiver.rs"

[[test]]
name = "test_prompt_macros"
required-features = ["server", "client"]
Expand Down

110 changes: 110 additions & 0 deletions
crates/rmcp/src/handler/client.rs

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -30,6 +30,22 @@ impl<H: ClientHandler> Service<RoleClient> for H {
 .create_elicitation(request.params, context)
 .await
 .map(ClientResult::CreateElicitationResult),
 ServerRequest::ListTasksRequest(request) => self
 .list_tasks(request.params, context)
 .await
 .map(ClientResult::ListTasksResult),
 ServerRequest::GetTaskInfoRequest(request) => self
 .get_task_info(request.params, context)
 .await
 .map(ClientResult::GetTaskResult),
 ServerRequest::GetTaskResultRequest(request) => self
 .get_task_result(request.params, context)
 .await
 .map(ClientResult::GetTaskPayloadResult),
 ServerRequest::DeleteTaskRequest(request) => self
 .delete_task(request.params, context)
 .await
 .map(ClientResult::DeleteTaskResult),
 ServerRequest::CustomRequest(request) => self
 .on_custom_request(request, context)
 .await
Expand DownExpand Up@@ -191,6 +207,68 @@ pub trait ClientHandler: Sized + Send + Sync + 'static {
 )))
 }

 /// Handle a `tasks/list` request from a server. Only relevant when the
 /// client is also a task *receiver* (e.g. it accepted a task-augmented
 /// `sampling/createMessage` or `elicitation/create` request).
 ///
 /// # Default Behavior
 /// Returns `-32601` (Method not found). Clients that advertise
 /// `capabilities.tasks.list` must override this.
 fn list_tasks(
 &self,
 request: Option<PaginatedRequestParams>,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<ListTasksResult, McpError>> + MaybeSendFuture + '_ {
 let _ = (request, context);
 std::future::ready(Err(McpError::method_not_found::<ListTasksMethod>()))
 }

 /// Handle a `tasks/get` request from a server. Only relevant when the
 /// client is also a task *receiver* (e.g. it accepted a task-augmented
 /// `sampling/createMessage` or `elicitation/create` request).
 ///
 /// # Default Behavior
 /// Returns `-32601` (Method not found). Clients that advertise
 /// `capabilities.tasks.requests.sampling.createMessage` or
 /// `capabilities.tasks.requests.elicitation.create` must override this.
 fn get_task_info(
 &self,
 request: GetTaskInfoParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<GetTaskResult, McpError>> + MaybeSendFuture + '_ {
 let _ = (request, context);
 std::future::ready(Err(McpError::method_not_found::<GetTaskInfoMethod>()))
 }

 /// Handle a `tasks/result` request from a server. Only relevant when
 /// the client is also a task *receiver*.
 ///
 /// # Default Behavior
 /// Returns `-32601` (Method not found).
 fn get_task_result(
 &self,
 request: GetTaskResultParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<GetTaskPayloadResult, McpError>> + MaybeSendFuture + '_ {
 let _ = (request, context);
 std::future::ready(Err(McpError::method_not_found::<GetTaskResultMethod>()))
 }

 /// Handle a `tasks/delete` request from a server (SEP-1686 §3.6).
 /// Only relevant when the client is also a task *receiver*.
 ///
 /// # Default Behavior
 /// Returns `-32601` (Method not found). Task receivers must override this
 /// to delete the task and any associated stored result.
 fn delete_task(
 &self,
 request: DeleteTaskParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<DeleteTaskResult, McpError>> + MaybeSendFuture + '_ {
 let _ = (request, context);
 std::future::ready(Err(McpError::method_not_found::<DeleteTaskMethod>()))
 }

 fn on_cancelled(
 &self,
 params: CancelledNotificationParam,
Expand DownExpand Up@@ -310,6 +388,38 @@ macro_rules! impl_client_handler_for_wrapper {
 (**self).on_custom_request(request, context)
 }

 fn list_tasks(
 &self,
 request: Option<PaginatedRequestParams>,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<ListTasksResult, McpError>> + MaybeSendFuture + '_ {
 (**self).list_tasks(request, context)
 }

 fn get_task_info(
 &self,
 request: GetTaskInfoParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<GetTaskResult, McpError>> + MaybeSendFuture + '_ {
 (**self).get_task_info(request, context)
 }

 fn get_task_result(
 &self,
 request: GetTaskResultParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<GetTaskPayloadResult, McpError>> + MaybeSendFuture + '_ {
 (**self).get_task_result(request, context)
 }

 fn delete_task(
 &self,
 request: DeleteTaskParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<DeleteTaskResult, McpError>> + MaybeSendFuture + '_ {
 (**self).delete_task(request, context)
 }

 fn on_cancelled(
 &self,
 params: CancelledNotificationParam,
Expand Down

22 changes: 11 additions & 11 deletions
crates/rmcp/src/handler/server.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -125,10 +125,10 @@ impl<H: ServerHandler> Service<RoleServer> for H {
 .get_task_result(request.params, context)
 .await
 .map(ServerResult::GetTaskPayloadResult),
 ClientRequest::CancelTaskRequest(request) => self
 .cancel_task(request.params, context)
 ClientRequest::DeleteTaskRequest(request) => self
 .delete_task(request.params, context)
 .await
 .map(ServerResult::CancelTaskResult),
 .map(ServerResult::DeleteTaskResult),
 };
 // SEP-2164: peers negotiating 2026-07-28+ get the standard INVALID_PARAMS code for
 // resource-not-found; older peers keep RESOURCE_NOT_FOUND. ISO `YYYY-MM-DD` versions
Expand DownExpand Up@@ -398,13 +398,13 @@ macro_rules! server_handler_methods {
 std::future::ready(Err(McpError::method_not_found::<GetTaskResultMethod>()))
 }

 fn cancel_task(
 fn delete_task(
 &self,
 request: CancelTaskParams,
 request: DeleteTaskParams,
 context: RequestContext<RoleServer>,
 ) -> impl Future<Output = Result<CancelTaskResult, McpError>> + MaybeSendFuture + '_ {
 ) -> impl Future<Output = Result<DeleteTaskResult, McpError>> + MaybeSendFuture + '_ {
 let _ = (request, context);
 std::future::ready(Err(McpError::method_not_found::<CancelTaskMethod>()))
 std::future::ready(Err(McpError::method_not_found::<DeleteTaskMethod>()))
 }
 };
}
Expand DownExpand Up@@ -614,12 +614,12 @@ macro_rules! impl_server_handler_for_wrapper {
 (**self).get_task_result(request, context)
 }

 fn cancel_task(
 fn delete_task(
 &self,
 request: CancelTaskParams,
 request: DeleteTaskParams,
 context: RequestContext<RoleServer>,
 ) -> impl Future<Output = Result<CancelTaskResult, McpError>> + MaybeSendFuture + '_ {
 (**self).cancel_task(request, context)
 ) -> impl Future<Output = Result<DeleteTaskResult, McpError>> + MaybeSendFuture + '_ {
 (**self).delete_task(request, context)
 }
 }
 };
Expand Down

42 changes: 31 additions & 11 deletions
crates/rmcp/src/model.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -3213,32 +3213,28 @@ impl RequestParamsMeta for GetTaskResultParams {
#[deprecated(since = "0.13.0", note = "Use GetTaskResultParams instead")]
pub type GetTaskResultParam = GetTaskResultParams;

const_string!(CancelTaskMethod = "tasks/cancel");
pub type CancelTaskRequest = Request<CancelTaskMethod, CancelTaskParams>;
const_string!(DeleteTaskMethod = "tasks/delete");
pub type DeleteTaskRequest = Request<DeleteTaskMethod, DeleteTaskParams>;

#[derive(Debug, Serialize, Deserialize, Clone, PartialEq)]
#[serde(rename_all = "camelCase")]
#[cfg_attr(feature = "schemars", derive(schemars::JsonSchema))]
#[expect(clippy::exhaustive_structs, reason = "intentionally exhaustive")]
pub struct CancelTaskParams {
pub struct DeleteTaskParams {
 /// Protocol-level metadata for this request (SEP-1319)
 #[serde(rename = "_meta", default, skip_serializing_if = "Option::is_none")]
 pub meta: Option<Meta>,
 pub task_id: String,
}

impl RequestParamsMeta for CancelTaskParams {
impl RequestParamsMeta for DeleteTaskParams {
 fn meta(&self) -> Option<&Meta> {
 self.meta.as_ref()
 }
 fn meta_mut(&mut self) -> &mut Option<Meta> {
 &mut self.meta
 }
}

/// Deprecated: Use [`CancelTaskParams`] instead (SEP-1319 compliance).
#[deprecated(since = "0.13.0", note = "Use CancelTaskParams instead")]
pub type CancelTaskParam = CancelTaskParams;
/// Deprecated: Use [`GetTaskResult`] instead (spec alignment).
#[deprecated(since = "0.15.0", note = "Use GetTaskResult instead")]
pub type GetTaskInfoResult = GetTaskResult;
Expand DownExpand Up@@ -3338,7 +3334,7 @@ ts_union!(
 | GetTaskInfoRequest
 | ListTasksRequest
 | GetTaskResultRequest
 | CancelTaskRequest
 | DeleteTaskRequest
 | CustomRequest;
);

Expand All@@ -3361,7 +3357,7 @@ impl ClientRequest {
 ClientRequest::GetTaskInfoRequest(r) => r.method.as_str(),
 ClientRequest::ListTasksRequest(r) => r.method.as_str(),
 ClientRequest::GetTaskResultRequest(r) => r.method.as_str(),
 ClientRequest::CancelTaskRequest(r) => r.method.as_str(),
 ClientRequest::DeleteTaskRequest(r) => r.method.as_str(),
 ClientRequest::CustomRequest(r) => r.method.as_str(),
 }
 }
Expand All@@ -3381,6 +3377,10 @@ ts_union!(
 box CreateMessageResult
 | ListRootsResult
 | CreateElicitationResult
 | ListTasksResult
 | GetTaskResult
 | GetTaskPayloadResult
 | DeleteTaskResult
 | EmptyResult
 | CustomResult;
);
Expand All@@ -3399,9 +3399,29 @@ ts_union!(
 | CreateMessageRequest
 | ListRootsRequest
 | CreateElicitationRequest
 | GetTaskInfoRequest
 | ListTasksRequest
 | GetTaskResultRequest
 | DeleteTaskRequest
 | CustomRequest;
);

impl ServerRequest {
 pub fn method(&self) -> &str {
 match &self {
 ServerRequest::PingRequest(r) => r.method.as_str(),
 ServerRequest::CreateMessageRequest(r) => r.method.as_str(),
 ServerRequest::ListRootsRequest(r) => r.method.as_str(),
 ServerRequest::CreateElicitationRequest(r) => r.method.as_str(),
 ServerRequest::GetTaskInfoRequest(r) => r.method.as_str(),
 ServerRequest::ListTasksRequest(r) => r.method.as_str(),
 ServerRequest::GetTaskResultRequest(r) => r.method.as_str(),
 ServerRequest::DeleteTaskRequest(r) => r.method.as_str(),
 ServerRequest::CustomRequest(r) => r.method.as_str(),
 }
 }
}

ts_union!(
 export type ServerNotification =
 | CancelledNotification
Expand DownExpand Up@@ -3429,7 +3449,7 @@ ts_union!(
 | CreateTaskResult
 | ListTasksResult
 | GetTaskResult
 | CancelTaskResult
 | DeleteTaskResult
 | CallToolResult
 | GetTaskPayloadResult
 | EmptyResult
Expand Down

6 changes: 5 additions & 1 deletion
crates/rmcp/src/model/meta.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -155,7 +155,7 @@ variant_extension! {
 GetTaskInfoRequest
 ListTasksRequest
 GetTaskResultRequest
CancelTaskRequest
DeleteTaskRequest
 }
}

Expand All@@ -166,6 +166,10 @@ variant_extension! {
 ListRootsRequest
 CreateElicitationRequest
 CustomRequest
 GetTaskInfoRequest
 ListTasksRequest
 GetTaskResultRequest
 DeleteTaskRequest
 }
}

Expand Down
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feat(task): route server-originated tasks/* to ClientHandler (SEP-1686)
#816
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726d182

feat(task): route server-originated tasks/* to ClientHandler (SEP-1686)


TheUnderdev Apr 20, 2026
62b4b40

fix(task): rename tasks/cancel to tasks/delete (SEP-1686 §3.6)


TheUnderdev May 13, 2026
0c4d5df

chore(task): regen golden schemas after rebase; relax semver enum lint


TheUnderdev Jun 23, 2026

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30 changes: 8 additions & 22 deletions
crates/rmcp-macros/src/task_handler.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -223,38 +223,24 @@ pub fn task_handler(attr: TokenStream, input: TokenStream) -> syn::Result<TokenS
 .push(syn::parse2::<ImplItem>(get_result_fn)?);
 }

 if !has_method("cancel_task", &item_impl) {
 let cancel_fn = quote! {
 async fn cancel_task(
 if !has_method("delete_task", &item_impl) {
 let delete_fn = quote! {
 async fn delete_task(
 &self,
 request: rmcp::model::CancelTaskParams,
 request: rmcp::model::DeleteTaskParams,
 _context: rmcp::service::RequestContext<rmcp::RoleServer>,
 ) -> Result<rmcp::model::CancelTaskResult, McpError> {
 use rmcp::task_manager::current_timestamp;
 ) -> Result<rmcp::model::DeleteTaskResult, McpError> {
 let task_id = request.task_id;
 let mut processor = (#processor).lock().await;

 if processor.cancel_task(&task_id) {
 let timestamp = current_timestamp();
 let task = rmcp::model::Task::new(
 task_id,
 rmcp::model::TaskStatus::Cancelled,
 timestamp.clone(),
 timestamp,
 );
 return Ok(rmcp::model::CancelTaskResult { meta: None, task });
 }

 // If already completed, signal it's not cancellable
 let exists_completed = processor.peek_completed().iter().any(|r| r.descriptor.operation_id == task_id);
 if exists_completed {
 return Err(McpError::invalid_request(format!("task already completed: {}", task_id), None));
 if processor.delete_task(&task_id) {
 return Ok(rmcp::model::DeleteTaskResult { meta: None });
 }

 Err(McpError::resource_not_found(format!("task not found: {}", task_id), None))
 }
 };
 item_impl.items.push(syn::parse2::<ImplItem>(cancel_fn)?);
 item_impl.items.push(syn::parse2::<ImplItem>(delete_fn)?);
 }

 // Auto-generate get_info() if not already provided and no sibling tool/prompt handler
Expand Down

15 changes: 15 additions & 0 deletions
crates/rmcp/Cargo.toml

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Original file line numberDiff line numberDiff line change
Expand Up@@ -42,6 +42,16 @@ features = [
]
rustdoc-args = ["--cfg", "docsrs"]

# The protocol message unions in `model.rs` (`ClientRequest`, `ServerRequest`,
# `ClientResult`, `ServerResult`, …) are generated by `ts_union!` and are
# intentionally `#[non_exhaustive]`-free (see the `clippy::exhaustive_enums`
# expectation on the macro): each new spec revision adds message variants.
# Adding a variant is non-breaking for downstream consumers — the enums are
# `#[serde(untagged)]` and gain `From` impls — so `enum_variant_added` is
# expected churn rather than a true semver break.
[package.metadata.cargo-semver-checks.lints]
enum_variant_added = "allow"

[dependencies]
async-trait = "0.1.89"
serde = { version = "1.0", features = ["derive", "rc"] }
Expand DownExpand Up@@ -293,6 +303,11 @@ name = "test_custom_request"
required-features = ["server", "client"]
path = "tests/test_custom_request.rs"

[[test]]
name = "test_task_client_receiver"
required-features = ["server", "client"]
path = "tests/test_task_client_receiver.rs"

[[test]]
name = "test_prompt_macros"
required-features = ["server", "client"]
Expand Down

110 changes: 110 additions & 0 deletions
crates/rmcp/src/handler/client.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -30,6 +30,22 @@ impl<H: ClientHandler> Service<RoleClient> for H {
 .create_elicitation(request.params, context)
 .await
 .map(ClientResult::CreateElicitationResult),
 ServerRequest::ListTasksRequest(request) => self
 .list_tasks(request.params, context)
 .await
 .map(ClientResult::ListTasksResult),
 ServerRequest::GetTaskInfoRequest(request) => self
 .get_task_info(request.params, context)
 .await
 .map(ClientResult::GetTaskResult),
 ServerRequest::GetTaskResultRequest(request) => self
 .get_task_result(request.params, context)
 .await
 .map(ClientResult::GetTaskPayloadResult),
 ServerRequest::DeleteTaskRequest(request) => self
 .delete_task(request.params, context)
 .await
 .map(ClientResult::DeleteTaskResult),
 ServerRequest::CustomRequest(request) => self
 .on_custom_request(request, context)
 .await
Expand DownExpand Up@@ -191,6 +207,68 @@ pub trait ClientHandler: Sized + Send + Sync + 'static {
 )))
 }

 /// Handle a `tasks/list` request from a server. Only relevant when the
 /// client is also a task *receiver* (e.g. it accepted a task-augmented
 /// `sampling/createMessage` or `elicitation/create` request).
 ///
 /// # Default Behavior
 /// Returns `-32601` (Method not found). Clients that advertise
 /// `capabilities.tasks.list` must override this.
 fn list_tasks(
 &self,
 request: Option<PaginatedRequestParams>,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<ListTasksResult, McpError>> + MaybeSendFuture + '_ {
 let _ = (request, context);
 std::future::ready(Err(McpError::method_not_found::<ListTasksMethod>()))
 }

 /// Handle a `tasks/get` request from a server. Only relevant when the
 /// client is also a task *receiver* (e.g. it accepted a task-augmented
 /// `sampling/createMessage` or `elicitation/create` request).
 ///
 /// # Default Behavior
 /// Returns `-32601` (Method not found). Clients that advertise
 /// `capabilities.tasks.requests.sampling.createMessage` or
 /// `capabilities.tasks.requests.elicitation.create` must override this.
 fn get_task_info(
 &self,
 request: GetTaskInfoParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<GetTaskResult, McpError>> + MaybeSendFuture + '_ {
 let _ = (request, context);
 std::future::ready(Err(McpError::method_not_found::<GetTaskInfoMethod>()))
 }

 /// Handle a `tasks/result` request from a server. Only relevant when
 /// the client is also a task *receiver*.
 ///
 /// # Default Behavior
 /// Returns `-32601` (Method not found).
 fn get_task_result(
 &self,
 request: GetTaskResultParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<GetTaskPayloadResult, McpError>> + MaybeSendFuture + '_ {
 let _ = (request, context);
 std::future::ready(Err(McpError::method_not_found::<GetTaskResultMethod>()))
 }

 /// Handle a `tasks/delete` request from a server (SEP-1686 §3.6).
 /// Only relevant when the client is also a task *receiver*.
 ///
 /// # Default Behavior
 /// Returns `-32601` (Method not found). Task receivers must override this
 /// to delete the task and any associated stored result.
 fn delete_task(
 &self,
 request: DeleteTaskParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<DeleteTaskResult, McpError>> + MaybeSendFuture + '_ {
 let _ = (request, context);
 std::future::ready(Err(McpError::method_not_found::<DeleteTaskMethod>()))
 }

 fn on_cancelled(
 &self,
 params: CancelledNotificationParam,
Expand DownExpand Up@@ -310,6 +388,38 @@ macro_rules! impl_client_handler_for_wrapper {
 (**self).on_custom_request(request, context)
 }

 fn list_tasks(
 &self,
 request: Option<PaginatedRequestParams>,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<ListTasksResult, McpError>> + MaybeSendFuture + '_ {
 (**self).list_tasks(request, context)
 }

 fn get_task_info(
 &self,
 request: GetTaskInfoParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<GetTaskResult, McpError>> + MaybeSendFuture + '_ {
 (**self).get_task_info(request, context)
 }

 fn get_task_result(
 &self,
 request: GetTaskResultParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<GetTaskPayloadResult, McpError>> + MaybeSendFuture + '_ {
 (**self).get_task_result(request, context)
 }

 fn delete_task(
 &self,
 request: DeleteTaskParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<DeleteTaskResult, McpError>> + MaybeSendFuture + '_ {
 (**self).delete_task(request, context)
 }

 fn on_cancelled(
 &self,
 params: CancelledNotificationParam,
Expand Down

22 changes: 11 additions & 11 deletions
crates/rmcp/src/handler/server.rs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -125,10 +125,10 @@ impl<H: ServerHandler> Service<RoleServer> for H {
 .get_task_result(request.params, context)
 .await
 .map(ServerResult::GetTaskPayloadResult),
 ClientRequest::CancelTaskRequest(request) => self
 .cancel_task(request.params, context)
 ClientRequest::DeleteTaskRequest(request) => self
 .delete_task(request.params, context)
 .await
 .map(ServerResult::CancelTaskResult),
 .map(ServerResult::DeleteTaskResult),
 };
 // SEP-2164: peers negotiating 2026-07-28+ get the standard INVALID_PARAMS code for
 // resource-not-found; older peers keep RESOURCE_NOT_FOUND. ISO `YYYY-MM-DD` versions
Expand DownExpand Up@@ -398,13 +398,13 @@ macro_rules! server_handler_methods {
 std::future::ready(Err(McpError::method_not_found::<GetTaskResultMethod>()))
 }

 fn cancel_task(
 fn delete_task(
 &self,
 request: CancelTaskParams,
 request: DeleteTaskParams,
 context: RequestContext<RoleServer>,
 ) -> impl Future<Output = Result<CancelTaskResult, McpError>> + MaybeSendFuture + '_ {
 ) -> impl Future<Output = Result<DeleteTaskResult, McpError>> + MaybeSendFuture + '_ {
 let _ = (request, context);
 std::future::ready(Err(McpError::method_not_found::<CancelTaskMethod>()))
 std::future::ready(Err(McpError::method_not_found::<DeleteTaskMethod>()))
 }
 };
}
Expand DownExpand Up@@ -614,12 +614,12 @@ macro_rules! impl_server_handler_for_wrapper {
 (**self).get_task_result(request, context)
 }

 fn cancel_task(
 fn delete_task(
 &self,
 request: CancelTaskParams,
 request: DeleteTaskParams,
 context: RequestContext<RoleServer>,
 ) -> impl Future<Output = Result<CancelTaskResult, McpError>> + MaybeSendFuture + '_ {
 (**self).cancel_task(request, context)
 ) -> impl Future<Output = Result<DeleteTaskResult, McpError>> + MaybeSendFuture + '_ {
 (**self).delete_task(request, context)
 }
 }
 };
Expand Down

42 changes: 31 additions & 11 deletions
crates/rmcp/src/model.rs

View file


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Original file line numberDiff line numberDiff line change
Expand Up@@ -3213,32 +3213,28 @@ impl RequestParamsMeta for GetTaskResultParams {
#[deprecated(since = "0.13.0", note = "Use GetTaskResultParams instead")]
pub type GetTaskResultParam = GetTaskResultParams;

const_string!(CancelTaskMethod = "tasks/cancel");
pub type CancelTaskRequest = Request<CancelTaskMethod, CancelTaskParams>;
const_string!(DeleteTaskMethod = "tasks/delete");
pub type DeleteTaskRequest = Request<DeleteTaskMethod, DeleteTaskParams>;

#[derive(Debug, Serialize, Deserialize, Clone, PartialEq)]
#[serde(rename_all = "camelCase")]
#[cfg_attr(feature = "schemars", derive(schemars::JsonSchema))]
#[expect(clippy::exhaustive_structs, reason = "intentionally exhaustive")]
pub struct CancelTaskParams {
pub struct DeleteTaskParams {
 /// Protocol-level metadata for this request (SEP-1319)
 #[serde(rename = "_meta", default, skip_serializing_if = "Option::is_none")]
 pub meta: Option<Meta>,
 pub task_id: String,
}

impl RequestParamsMeta for CancelTaskParams {
impl RequestParamsMeta for DeleteTaskParams {
 fn meta(&self) -> Option<&Meta> {
 self.meta.as_ref()
 }
 fn meta_mut(&mut self) -> &mut Option<Meta> {
 &mut self.meta
 }
}

/// Deprecated: Use [`CancelTaskParams`] instead (SEP-1319 compliance).
#[deprecated(since = "0.13.0", note = "Use CancelTaskParams instead")]
pub type CancelTaskParam = CancelTaskParams;
/// Deprecated: Use [`GetTaskResult`] instead (spec alignment).
#[deprecated(since = "0.15.0", note = "Use GetTaskResult instead")]
pub type GetTaskInfoResult = GetTaskResult;
Expand DownExpand Up@@ -3338,7 +3334,7 @@ ts_union!(
 | GetTaskInfoRequest
 | ListTasksRequest
 | GetTaskResultRequest
 | CancelTaskRequest
 | DeleteTaskRequest
 | CustomRequest;
);

Expand All@@ -3361,7 +3357,7 @@ impl ClientRequest {
 ClientRequest::GetTaskInfoRequest(r) => r.method.as_str(),
 ClientRequest::ListTasksRequest(r) => r.method.as_str(),
 ClientRequest::GetTaskResultRequest(r) => r.method.as_str(),
 ClientRequest::CancelTaskRequest(r) => r.method.as_str(),
 ClientRequest::DeleteTaskRequest(r) => r.method.as_str(),
 ClientRequest::CustomRequest(r) => r.method.as_str(),
 }
 }
Expand All@@ -3381,6 +3377,10 @@ ts_union!(
 box CreateMessageResult
 | ListRootsResult
 | CreateElicitationResult
 | ListTasksResult
 | GetTaskResult
 | GetTaskPayloadResult
 | DeleteTaskResult
 | EmptyResult
 | CustomResult;
);
Expand All@@ -3399,9 +3399,29 @@ ts_union!(
 | CreateMessageRequest
 | ListRootsRequest
 | CreateElicitationRequest
 | GetTaskInfoRequest
 | ListTasksRequest
 | GetTaskResultRequest
 | DeleteTaskRequest
 | CustomRequest;
);

impl ServerRequest {
 pub fn method(&self) -> &str {
 match &self {
 ServerRequest::PingRequest(r) => r.method.as_str(),
 ServerRequest::CreateMessageRequest(r) => r.method.as_str(),
 ServerRequest::ListRootsRequest(r) => r.method.as_str(),
 ServerRequest::CreateElicitationRequest(r) => r.method.as_str(),
 ServerRequest::GetTaskInfoRequest(r) => r.method.as_str(),
 ServerRequest::ListTasksRequest(r) => r.method.as_str(),
 ServerRequest::GetTaskResultRequest(r) => r.method.as_str(),
 ServerRequest::DeleteTaskRequest(r) => r.method.as_str(),
 ServerRequest::CustomRequest(r) => r.method.as_str(),
 }
 }
}

ts_union!(
 export type ServerNotification =
 | CancelledNotification
Expand DownExpand Up@@ -3429,7 +3449,7 @@ ts_union!(
 | CreateTaskResult
 | ListTasksResult
 | GetTaskResult
 | CancelTaskResult
 | DeleteTaskResult
 | CallToolResult
 | GetTaskPayloadResult
 | EmptyResult
Expand Down

6 changes: 5 additions & 1 deletion
crates/rmcp/src/model/meta.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -155,7 +155,7 @@ variant_extension! {
 GetTaskInfoRequest
 ListTasksRequest
 GetTaskResultRequest
CancelTaskRequest
DeleteTaskRequest
 }
}

Expand All@@ -166,6 +166,10 @@ variant_extension! {
 ListRootsRequest
 CreateElicitationRequest
 CustomRequest
 GetTaskInfoRequest
 ListTasksRequest
 GetTaskResultRequest
 DeleteTaskRequest
 }
}

Expand Down
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
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feat(task): route server-originated tasks/* to ClientHandler (SEP-1686)
#816
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726d182

feat(task): route server-originated tasks/* to ClientHandler (SEP-1686)


TheUnderdev Apr 20, 2026
62b4b40

fix(task): rename tasks/cancel to tasks/delete (SEP-1686 §3.6)


TheUnderdev May 13, 2026
0c4d5df

chore(task): regen golden schemas after rebase; relax semver enum lint


TheUnderdev Jun 23, 2026

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30 changes: 8 additions & 22 deletions
crates/rmcp-macros/src/task_handler.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -223,38 +223,24 @@ pub fn task_handler(attr: TokenStream, input: TokenStream) -> syn::Result<TokenS
 .push(syn::parse2::<ImplItem>(get_result_fn)?);
 }

 if !has_method("cancel_task", &item_impl) {
 let cancel_fn = quote! {
 async fn cancel_task(
 if !has_method("delete_task", &item_impl) {
 let delete_fn = quote! {
 async fn delete_task(
 &self,
 request: rmcp::model::CancelTaskParams,
 request: rmcp::model::DeleteTaskParams,
 _context: rmcp::service::RequestContext<rmcp::RoleServer>,
 ) -> Result<rmcp::model::CancelTaskResult, McpError> {
 use rmcp::task_manager::current_timestamp;
 ) -> Result<rmcp::model::DeleteTaskResult, McpError> {
 let task_id = request.task_id;
 let mut processor = (#processor).lock().await;

 if processor.cancel_task(&task_id) {
 let timestamp = current_timestamp();
 let task = rmcp::model::Task::new(
 task_id,
 rmcp::model::TaskStatus::Cancelled,
 timestamp.clone(),
 timestamp,
 );
 return Ok(rmcp::model::CancelTaskResult { meta: None, task });
 }

 // If already completed, signal it's not cancellable
 let exists_completed = processor.peek_completed().iter().any(|r| r.descriptor.operation_id == task_id);
 if exists_completed {
 return Err(McpError::invalid_request(format!("task already completed: {}", task_id), None));
 if processor.delete_task(&task_id) {
 return Ok(rmcp::model::DeleteTaskResult { meta: None });
 }

 Err(McpError::resource_not_found(format!("task not found: {}", task_id), None))
 }
 };
 item_impl.items.push(syn::parse2::<ImplItem>(cancel_fn)?);
 item_impl.items.push(syn::parse2::<ImplItem>(delete_fn)?);
 }

 // Auto-generate get_info() if not already provided and no sibling tool/prompt handler
Expand Down

15 changes: 15 additions & 0 deletions
crates/rmcp/Cargo.toml

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Original file line numberDiff line numberDiff line change
Expand Up@@ -42,6 +42,16 @@ features = [
]
rustdoc-args = ["--cfg", "docsrs"]

# The protocol message unions in `model.rs` (`ClientRequest`, `ServerRequest`,
# `ClientResult`, `ServerResult`, …) are generated by `ts_union!` and are
# intentionally `#[non_exhaustive]`-free (see the `clippy::exhaustive_enums`
# expectation on the macro): each new spec revision adds message variants.
# Adding a variant is non-breaking for downstream consumers — the enums are
# `#[serde(untagged)]` and gain `From` impls — so `enum_variant_added` is
# expected churn rather than a true semver break.
[package.metadata.cargo-semver-checks.lints]
enum_variant_added = "allow"

[dependencies]
async-trait = "0.1.89"
serde = { version = "1.0", features = ["derive", "rc"] }
Expand DownExpand Up@@ -293,6 +303,11 @@ name = "test_custom_request"
required-features = ["server", "client"]
path = "tests/test_custom_request.rs"

[[test]]
name = "test_task_client_receiver"
required-features = ["server", "client"]
path = "tests/test_task_client_receiver.rs"

[[test]]
name = "test_prompt_macros"
required-features = ["server", "client"]
Expand Down

110 changes: 110 additions & 0 deletions
crates/rmcp/src/handler/client.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -30,6 +30,22 @@ impl<H: ClientHandler> Service<RoleClient> for H {
 .create_elicitation(request.params, context)
 .await
 .map(ClientResult::CreateElicitationResult),
 ServerRequest::ListTasksRequest(request) => self
 .list_tasks(request.params, context)
 .await
 .map(ClientResult::ListTasksResult),
 ServerRequest::GetTaskInfoRequest(request) => self
 .get_task_info(request.params, context)
 .await
 .map(ClientResult::GetTaskResult),
 ServerRequest::GetTaskResultRequest(request) => self
 .get_task_result(request.params, context)
 .await
 .map(ClientResult::GetTaskPayloadResult),
 ServerRequest::DeleteTaskRequest(request) => self
 .delete_task(request.params, context)
 .await
 .map(ClientResult::DeleteTaskResult),
 ServerRequest::CustomRequest(request) => self
 .on_custom_request(request, context)
 .await
Expand DownExpand Up@@ -191,6 +207,68 @@ pub trait ClientHandler: Sized + Send + Sync + 'static {
 )))
 }

 /// Handle a `tasks/list` request from a server. Only relevant when the
 /// client is also a task *receiver* (e.g. it accepted a task-augmented
 /// `sampling/createMessage` or `elicitation/create` request).
 ///
 /// # Default Behavior
 /// Returns `-32601` (Method not found). Clients that advertise
 /// `capabilities.tasks.list` must override this.
 fn list_tasks(
 &self,
 request: Option<PaginatedRequestParams>,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<ListTasksResult, McpError>> + MaybeSendFuture + '_ {
 let _ = (request, context);
 std::future::ready(Err(McpError::method_not_found::<ListTasksMethod>()))
 }

 /// Handle a `tasks/get` request from a server. Only relevant when the
 /// client is also a task *receiver* (e.g. it accepted a task-augmented
 /// `sampling/createMessage` or `elicitation/create` request).
 ///
 /// # Default Behavior
 /// Returns `-32601` (Method not found). Clients that advertise
 /// `capabilities.tasks.requests.sampling.createMessage` or
 /// `capabilities.tasks.requests.elicitation.create` must override this.
 fn get_task_info(
 &self,
 request: GetTaskInfoParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<GetTaskResult, McpError>> + MaybeSendFuture + '_ {
 let _ = (request, context);
 std::future::ready(Err(McpError::method_not_found::<GetTaskInfoMethod>()))
 }

 /// Handle a `tasks/result` request from a server. Only relevant when
 /// the client is also a task *receiver*.
 ///
 /// # Default Behavior
 /// Returns `-32601` (Method not found).
 fn get_task_result(
 &self,
 request: GetTaskResultParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<GetTaskPayloadResult, McpError>> + MaybeSendFuture + '_ {
 let _ = (request, context);
 std::future::ready(Err(McpError::method_not_found::<GetTaskResultMethod>()))
 }

 /// Handle a `tasks/delete` request from a server (SEP-1686 §3.6).
 /// Only relevant when the client is also a task *receiver*.
 ///
 /// # Default Behavior
 /// Returns `-32601` (Method not found). Task receivers must override this
 /// to delete the task and any associated stored result.
 fn delete_task(
 &self,
 request: DeleteTaskParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<DeleteTaskResult, McpError>> + MaybeSendFuture + '_ {
 let _ = (request, context);
 std::future::ready(Err(McpError::method_not_found::<DeleteTaskMethod>()))
 }

 fn on_cancelled(
 &self,
 params: CancelledNotificationParam,
Expand DownExpand Up@@ -310,6 +388,38 @@ macro_rules! impl_client_handler_for_wrapper {
 (**self).on_custom_request(request, context)
 }

 fn list_tasks(
 &self,
 request: Option<PaginatedRequestParams>,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<ListTasksResult, McpError>> + MaybeSendFuture + '_ {
 (**self).list_tasks(request, context)
 }

 fn get_task_info(
 &self,
 request: GetTaskInfoParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<GetTaskResult, McpError>> + MaybeSendFuture + '_ {
 (**self).get_task_info(request, context)
 }

 fn get_task_result(
 &self,
 request: GetTaskResultParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<GetTaskPayloadResult, McpError>> + MaybeSendFuture + '_ {
 (**self).get_task_result(request, context)
 }

 fn delete_task(
 &self,
 request: DeleteTaskParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<DeleteTaskResult, McpError>> + MaybeSendFuture + '_ {
 (**self).delete_task(request, context)
 }

 fn on_cancelled(
 &self,
 params: CancelledNotificationParam,
Expand Down

22 changes: 11 additions & 11 deletions
crates/rmcp/src/handler/server.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -125,10 +125,10 @@ impl<H: ServerHandler> Service<RoleServer> for H {
 .get_task_result(request.params, context)
 .await
 .map(ServerResult::GetTaskPayloadResult),
 ClientRequest::CancelTaskRequest(request) => self
 .cancel_task(request.params, context)
 ClientRequest::DeleteTaskRequest(request) => self
 .delete_task(request.params, context)
 .await
 .map(ServerResult::CancelTaskResult),
 .map(ServerResult::DeleteTaskResult),
 };
 // SEP-2164: peers negotiating 2026-07-28+ get the standard INVALID_PARAMS code for
 // resource-not-found; older peers keep RESOURCE_NOT_FOUND. ISO `YYYY-MM-DD` versions
Expand DownExpand Up@@ -398,13 +398,13 @@ macro_rules! server_handler_methods {
 std::future::ready(Err(McpError::method_not_found::<GetTaskResultMethod>()))
 }

 fn cancel_task(
 fn delete_task(
 &self,
 request: CancelTaskParams,
 request: DeleteTaskParams,
 context: RequestContext<RoleServer>,
 ) -> impl Future<Output = Result<CancelTaskResult, McpError>> + MaybeSendFuture + '_ {
 ) -> impl Future<Output = Result<DeleteTaskResult, McpError>> + MaybeSendFuture + '_ {
 let _ = (request, context);
 std::future::ready(Err(McpError::method_not_found::<CancelTaskMethod>()))
 std::future::ready(Err(McpError::method_not_found::<DeleteTaskMethod>()))
 }
 };
}
Expand DownExpand Up@@ -614,12 +614,12 @@ macro_rules! impl_server_handler_for_wrapper {
 (**self).get_task_result(request, context)
 }

 fn cancel_task(
 fn delete_task(
 &self,
 request: CancelTaskParams,
 request: DeleteTaskParams,
 context: RequestContext<RoleServer>,
 ) -> impl Future<Output = Result<CancelTaskResult, McpError>> + MaybeSendFuture + '_ {
 (**self).cancel_task(request, context)
 ) -> impl Future<Output = Result<DeleteTaskResult, McpError>> + MaybeSendFuture + '_ {
 (**self).delete_task(request, context)
 }
 }
 };
Expand Down

42 changes: 31 additions & 11 deletions
crates/rmcp/src/model.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -3213,32 +3213,28 @@ impl RequestParamsMeta for GetTaskResultParams {
#[deprecated(since = "0.13.0", note = "Use GetTaskResultParams instead")]
pub type GetTaskResultParam = GetTaskResultParams;

const_string!(CancelTaskMethod = "tasks/cancel");
pub type CancelTaskRequest = Request<CancelTaskMethod, CancelTaskParams>;
const_string!(DeleteTaskMethod = "tasks/delete");
pub type DeleteTaskRequest = Request<DeleteTaskMethod, DeleteTaskParams>;

#[derive(Debug, Serialize, Deserialize, Clone, PartialEq)]
#[serde(rename_all = "camelCase")]
#[cfg_attr(feature = "schemars", derive(schemars::JsonSchema))]
#[expect(clippy::exhaustive_structs, reason = "intentionally exhaustive")]
pub struct CancelTaskParams {
pub struct DeleteTaskParams {
 /// Protocol-level metadata for this request (SEP-1319)
 #[serde(rename = "_meta", default, skip_serializing_if = "Option::is_none")]
 pub meta: Option<Meta>,
 pub task_id: String,
}

impl RequestParamsMeta for CancelTaskParams {
impl RequestParamsMeta for DeleteTaskParams {
 fn meta(&self) -> Option<&Meta> {
 self.meta.as_ref()
 }
 fn meta_mut(&mut self) -> &mut Option<Meta> {
 &mut self.meta
 }
}

/// Deprecated: Use [`CancelTaskParams`] instead (SEP-1319 compliance).
#[deprecated(since = "0.13.0", note = "Use CancelTaskParams instead")]
pub type CancelTaskParam = CancelTaskParams;
/// Deprecated: Use [`GetTaskResult`] instead (spec alignment).
#[deprecated(since = "0.15.0", note = "Use GetTaskResult instead")]
pub type GetTaskInfoResult = GetTaskResult;
Expand DownExpand Up@@ -3338,7 +3334,7 @@ ts_union!(
 | GetTaskInfoRequest
 | ListTasksRequest
 | GetTaskResultRequest
 | CancelTaskRequest
 | DeleteTaskRequest
 | CustomRequest;
);

Expand All@@ -3361,7 +3357,7 @@ impl ClientRequest {
 ClientRequest::GetTaskInfoRequest(r) => r.method.as_str(),
 ClientRequest::ListTasksRequest(r) => r.method.as_str(),
 ClientRequest::GetTaskResultRequest(r) => r.method.as_str(),
 ClientRequest::CancelTaskRequest(r) => r.method.as_str(),
 ClientRequest::DeleteTaskRequest(r) => r.method.as_str(),
 ClientRequest::CustomRequest(r) => r.method.as_str(),
 }
 }
Expand All@@ -3381,6 +3377,10 @@ ts_union!(
 box CreateMessageResult
 | ListRootsResult
 | CreateElicitationResult
 | ListTasksResult
 | GetTaskResult
 | GetTaskPayloadResult
 | DeleteTaskResult
 | EmptyResult
 | CustomResult;
);
Expand All@@ -3399,9 +3399,29 @@ ts_union!(
 | CreateMessageRequest
 | ListRootsRequest
 | CreateElicitationRequest
 | GetTaskInfoRequest
 | ListTasksRequest
 | GetTaskResultRequest
 | DeleteTaskRequest
 | CustomRequest;
);

impl ServerRequest {
 pub fn method(&self) -> &str {
 match &self {
 ServerRequest::PingRequest(r) => r.method.as_str(),
 ServerRequest::CreateMessageRequest(r) => r.method.as_str(),
 ServerRequest::ListRootsRequest(r) => r.method.as_str(),
 ServerRequest::CreateElicitationRequest(r) => r.method.as_str(),
 ServerRequest::GetTaskInfoRequest(r) => r.method.as_str(),
 ServerRequest::ListTasksRequest(r) => r.method.as_str(),
 ServerRequest::GetTaskResultRequest(r) => r.method.as_str(),
 ServerRequest::DeleteTaskRequest(r) => r.method.as_str(),
 ServerRequest::CustomRequest(r) => r.method.as_str(),
 }
 }
}

ts_union!(
 export type ServerNotification =
 | CancelledNotification
Expand DownExpand Up@@ -3429,7 +3449,7 @@ ts_union!(
 | CreateTaskResult
 | ListTasksResult
 | GetTaskResult
 | CancelTaskResult
 | DeleteTaskResult
 | CallToolResult
 | GetTaskPayloadResult
 | EmptyResult
Expand Down

6 changes: 5 additions & 1 deletion
crates/rmcp/src/model/meta.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -155,7 +155,7 @@ variant_extension! {
 GetTaskInfoRequest
 ListTasksRequest
 GetTaskResultRequest
CancelTaskRequest
DeleteTaskRequest
 }
}

Expand All@@ -166,6 +166,10 @@ variant_extension! {
 ListRootsRequest
 CreateElicitationRequest
 CustomRequest
 GetTaskInfoRequest
 ListTasksRequest
 GetTaskResultRequest
 DeleteTaskRequest
 }
}

Expand Down
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style.id = 'universal-dark-mode-style';
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background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
img, video, iframe, canvas, svg, picture, [style*="background-image"] {
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filter: invert(1) hue-rotate(180deg) !important;
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border-color: #444 !important;
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feat(task): route server-originated tasks/* to ClientHandler (SEP-1686)#816

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feat(task): route server-originated tasks/* to ClientHandler (SEP-1686)
#816
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726d182

feat(task): route server-originated tasks/* to ClientHandler (SEP-1686)


TheUnderdev Apr 20, 2026
62b4b40

fix(task): rename tasks/cancel to tasks/delete (SEP-1686 §3.6)


TheUnderdev May 13, 2026
0c4d5df

chore(task): regen golden schemas after rebase; relax semver enum lint


TheUnderdev Jun 23, 2026

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30 changes: 8 additions & 22 deletions
crates/rmcp-macros/src/task_handler.rs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -223,38 +223,24 @@ pub fn task_handler(attr: TokenStream, input: TokenStream) -> syn::Result<TokenS
 .push(syn::parse2::<ImplItem>(get_result_fn)?);
 }

 if !has_method("cancel_task", &item_impl) {
 let cancel_fn = quote! {
 async fn cancel_task(
 if !has_method("delete_task", &item_impl) {
 let delete_fn = quote! {
 async fn delete_task(
 &self,
 request: rmcp::model::CancelTaskParams,
 request: rmcp::model::DeleteTaskParams,
 _context: rmcp::service::RequestContext<rmcp::RoleServer>,
 ) -> Result<rmcp::model::CancelTaskResult, McpError> {
 use rmcp::task_manager::current_timestamp;
 ) -> Result<rmcp::model::DeleteTaskResult, McpError> {
 let task_id = request.task_id;
 let mut processor = (#processor).lock().await;

 if processor.cancel_task(&task_id) {
 let timestamp = current_timestamp();
 let task = rmcp::model::Task::new(
 task_id,
 rmcp::model::TaskStatus::Cancelled,
 timestamp.clone(),
 timestamp,
 );
 return Ok(rmcp::model::CancelTaskResult { meta: None, task });
 }

 // If already completed, signal it's not cancellable
 let exists_completed = processor.peek_completed().iter().any(|r| r.descriptor.operation_id == task_id);
 if exists_completed {
 return Err(McpError::invalid_request(format!("task already completed: {}", task_id), None));
 if processor.delete_task(&task_id) {
 return Ok(rmcp::model::DeleteTaskResult { meta: None });
 }

 Err(McpError::resource_not_found(format!("task not found: {}", task_id), None))
 }
 };
 item_impl.items.push(syn::parse2::<ImplItem>(cancel_fn)?);
 item_impl.items.push(syn::parse2::<ImplItem>(delete_fn)?);
 }

 // Auto-generate get_info() if not already provided and no sibling tool/prompt handler
Expand Down

15 changes: 15 additions & 0 deletions
crates/rmcp/Cargo.toml

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -42,6 +42,16 @@ features = [
]
rustdoc-args = ["--cfg", "docsrs"]

# The protocol message unions in `model.rs` (`ClientRequest`, `ServerRequest`,
# `ClientResult`, `ServerResult`, …) are generated by `ts_union!` and are
# intentionally `#[non_exhaustive]`-free (see the `clippy::exhaustive_enums`
# expectation on the macro): each new spec revision adds message variants.
# Adding a variant is non-breaking for downstream consumers — the enums are
# `#[serde(untagged)]` and gain `From` impls — so `enum_variant_added` is
# expected churn rather than a true semver break.
[package.metadata.cargo-semver-checks.lints]
enum_variant_added = "allow"

[dependencies]
async-trait = "0.1.89"
serde = { version = "1.0", features = ["derive", "rc"] }
Expand DownExpand Up@@ -293,6 +303,11 @@ name = "test_custom_request"
required-features = ["server", "client"]
path = "tests/test_custom_request.rs"

[[test]]
name = "test_task_client_receiver"
required-features = ["server", "client"]
path = "tests/test_task_client_receiver.rs"

[[test]]
name = "test_prompt_macros"
required-features = ["server", "client"]
Expand Down

110 changes: 110 additions & 0 deletions
crates/rmcp/src/handler/client.rs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -30,6 +30,22 @@ impl<H: ClientHandler> Service<RoleClient> for H {
 .create_elicitation(request.params, context)
 .await
 .map(ClientResult::CreateElicitationResult),
 ServerRequest::ListTasksRequest(request) => self
 .list_tasks(request.params, context)
 .await
 .map(ClientResult::ListTasksResult),
 ServerRequest::GetTaskInfoRequest(request) => self
 .get_task_info(request.params, context)
 .await
 .map(ClientResult::GetTaskResult),
 ServerRequest::GetTaskResultRequest(request) => self
 .get_task_result(request.params, context)
 .await
 .map(ClientResult::GetTaskPayloadResult),
 ServerRequest::DeleteTaskRequest(request) => self
 .delete_task(request.params, context)
 .await
 .map(ClientResult::DeleteTaskResult),
 ServerRequest::CustomRequest(request) => self
 .on_custom_request(request, context)
 .await
Expand DownExpand Up@@ -191,6 +207,68 @@ pub trait ClientHandler: Sized + Send + Sync + 'static {
 )))
 }

 /// Handle a `tasks/list` request from a server. Only relevant when the
 /// client is also a task *receiver* (e.g. it accepted a task-augmented
 /// `sampling/createMessage` or `elicitation/create` request).
 ///
 /// # Default Behavior
 /// Returns `-32601` (Method not found). Clients that advertise
 /// `capabilities.tasks.list` must override this.
 fn list_tasks(
 &self,
 request: Option<PaginatedRequestParams>,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<ListTasksResult, McpError>> + MaybeSendFuture + '_ {
 let _ = (request, context);
 std::future::ready(Err(McpError::method_not_found::<ListTasksMethod>()))
 }

 /// Handle a `tasks/get` request from a server. Only relevant when the
 /// client is also a task *receiver* (e.g. it accepted a task-augmented
 /// `sampling/createMessage` or `elicitation/create` request).
 ///
 /// # Default Behavior
 /// Returns `-32601` (Method not found). Clients that advertise
 /// `capabilities.tasks.requests.sampling.createMessage` or
 /// `capabilities.tasks.requests.elicitation.create` must override this.
 fn get_task_info(
 &self,
 request: GetTaskInfoParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<GetTaskResult, McpError>> + MaybeSendFuture + '_ {
 let _ = (request, context);
 std::future::ready(Err(McpError::method_not_found::<GetTaskInfoMethod>()))
 }

 /// Handle a `tasks/result` request from a server. Only relevant when
 /// the client is also a task *receiver*.
 ///
 /// # Default Behavior
 /// Returns `-32601` (Method not found).
 fn get_task_result(
 &self,
 request: GetTaskResultParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<GetTaskPayloadResult, McpError>> + MaybeSendFuture + '_ {
 let _ = (request, context);
 std::future::ready(Err(McpError::method_not_found::<GetTaskResultMethod>()))
 }

 /// Handle a `tasks/delete` request from a server (SEP-1686 §3.6).
 /// Only relevant when the client is also a task *receiver*.
 ///
 /// # Default Behavior
 /// Returns `-32601` (Method not found). Task receivers must override this
 /// to delete the task and any associated stored result.
 fn delete_task(
 &self,
 request: DeleteTaskParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<DeleteTaskResult, McpError>> + MaybeSendFuture + '_ {
 let _ = (request, context);
 std::future::ready(Err(McpError::method_not_found::<DeleteTaskMethod>()))
 }

 fn on_cancelled(
 &self,
 params: CancelledNotificationParam,
Expand DownExpand Up@@ -310,6 +388,38 @@ macro_rules! impl_client_handler_for_wrapper {
 (**self).on_custom_request(request, context)
 }

 fn list_tasks(
 &self,
 request: Option<PaginatedRequestParams>,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<ListTasksResult, McpError>> + MaybeSendFuture + '_ {
 (**self).list_tasks(request, context)
 }

 fn get_task_info(
 &self,
 request: GetTaskInfoParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<GetTaskResult, McpError>> + MaybeSendFuture + '_ {
 (**self).get_task_info(request, context)
 }

 fn get_task_result(
 &self,
 request: GetTaskResultParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<GetTaskPayloadResult, McpError>> + MaybeSendFuture + '_ {
 (**self).get_task_result(request, context)
 }

 fn delete_task(
 &self,
 request: DeleteTaskParams,
 context: RequestContext<RoleClient>,
 ) -> impl Future<Output = Result<DeleteTaskResult, McpError>> + MaybeSendFuture + '_ {
 (**self).delete_task(request, context)
 }

 fn on_cancelled(
 &self,
 params: CancelledNotificationParam,
Expand Down

22 changes: 11 additions & 11 deletions
crates/rmcp/src/handler/server.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -125,10 +125,10 @@ impl<H: ServerHandler> Service<RoleServer> for H {
 .get_task_result(request.params, context)
 .await
 .map(ServerResult::GetTaskPayloadResult),
 ClientRequest::CancelTaskRequest(request) => self
 .cancel_task(request.params, context)
 ClientRequest::DeleteTaskRequest(request) => self
 .delete_task(request.params, context)
 .await
 .map(ServerResult::CancelTaskResult),
 .map(ServerResult::DeleteTaskResult),
 };
 // SEP-2164: peers negotiating 2026-07-28+ get the standard INVALID_PARAMS code for
 // resource-not-found; older peers keep RESOURCE_NOT_FOUND. ISO `YYYY-MM-DD` versions
Expand DownExpand Up@@ -398,13 +398,13 @@ macro_rules! server_handler_methods {
 std::future::ready(Err(McpError::method_not_found::<GetTaskResultMethod>()))
 }

 fn cancel_task(
 fn delete_task(
 &self,
 request: CancelTaskParams,
 request: DeleteTaskParams,
 context: RequestContext<RoleServer>,
 ) -> impl Future<Output = Result<CancelTaskResult, McpError>> + MaybeSendFuture + '_ {
 ) -> impl Future<Output = Result<DeleteTaskResult, McpError>> + MaybeSendFuture + '_ {
 let _ = (request, context);
 std::future::ready(Err(McpError::method_not_found::<CancelTaskMethod>()))
 std::future::ready(Err(McpError::method_not_found::<DeleteTaskMethod>()))
 }
 };
}
Expand DownExpand Up@@ -614,12 +614,12 @@ macro_rules! impl_server_handler_for_wrapper {
 (**self).get_task_result(request, context)
 }

 fn cancel_task(
 fn delete_task(
 &self,
 request: CancelTaskParams,
 request: DeleteTaskParams,
 context: RequestContext<RoleServer>,
 ) -> impl Future<Output = Result<CancelTaskResult, McpError>> + MaybeSendFuture + '_ {
 (**self).cancel_task(request, context)
 ) -> impl Future<Output = Result<DeleteTaskResult, McpError>> + MaybeSendFuture + '_ {
 (**self).delete_task(request, context)
 }
 }
 };
Expand Down

42 changes: 31 additions & 11 deletions
crates/rmcp/src/model.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -3213,32 +3213,28 @@ impl RequestParamsMeta for GetTaskResultParams {
#[deprecated(since = "0.13.0", note = "Use GetTaskResultParams instead")]
pub type GetTaskResultParam = GetTaskResultParams;

const_string!(CancelTaskMethod = "tasks/cancel");
pub type CancelTaskRequest = Request<CancelTaskMethod, CancelTaskParams>;
const_string!(DeleteTaskMethod = "tasks/delete");
pub type DeleteTaskRequest = Request<DeleteTaskMethod, DeleteTaskParams>;

#[derive(Debug, Serialize, Deserialize, Clone, PartialEq)]
#[serde(rename_all = "camelCase")]
#[cfg_attr(feature = "schemars", derive(schemars::JsonSchema))]
#[expect(clippy::exhaustive_structs, reason = "intentionally exhaustive")]
pub struct CancelTaskParams {
pub struct DeleteTaskParams {
 /// Protocol-level metadata for this request (SEP-1319)
 #[serde(rename = "_meta", default, skip_serializing_if = "Option::is_none")]
 pub meta: Option<Meta>,
 pub task_id: String,
}

impl RequestParamsMeta for CancelTaskParams {
impl RequestParamsMeta for DeleteTaskParams {
 fn meta(&self) -> Option<&Meta> {
 self.meta.as_ref()
 }
 fn meta_mut(&mut self) -> &mut Option<Meta> {
 &mut self.meta
 }
}

/// Deprecated: Use [`CancelTaskParams`] instead (SEP-1319 compliance).
#[deprecated(since = "0.13.0", note = "Use CancelTaskParams instead")]
pub type CancelTaskParam = CancelTaskParams;
/// Deprecated: Use [`GetTaskResult`] instead (spec alignment).
#[deprecated(since = "0.15.0", note = "Use GetTaskResult instead")]
pub type GetTaskInfoResult = GetTaskResult;
Expand DownExpand Up@@ -3338,7 +3334,7 @@ ts_union!(
 | GetTaskInfoRequest
 | ListTasksRequest
 | GetTaskResultRequest
 | CancelTaskRequest
 | DeleteTaskRequest
 | CustomRequest;
);

Expand All@@ -3361,7 +3357,7 @@ impl ClientRequest {
 ClientRequest::GetTaskInfoRequest(r) => r.method.as_str(),
 ClientRequest::ListTasksRequest(r) => r.method.as_str(),
 ClientRequest::GetTaskResultRequest(r) => r.method.as_str(),
 ClientRequest::CancelTaskRequest(r) => r.method.as_str(),
 ClientRequest::DeleteTaskRequest(r) => r.method.as_str(),
 ClientRequest::CustomRequest(r) => r.method.as_str(),
 }
 }
Expand All@@ -3381,6 +3377,10 @@ ts_union!(
 box CreateMessageResult
 | ListRootsResult
 | CreateElicitationResult
 | ListTasksResult
 | GetTaskResult
 | GetTaskPayloadResult
 | DeleteTaskResult
 | EmptyResult
 | CustomResult;
);
Expand All@@ -3399,9 +3399,29 @@ ts_union!(
 | CreateMessageRequest
 | ListRootsRequest
 | CreateElicitationRequest
 | GetTaskInfoRequest
 | ListTasksRequest
 | GetTaskResultRequest
 | DeleteTaskRequest
 | CustomRequest;
);

impl ServerRequest {
 pub fn method(&self) -> &str {
 match &self {
 ServerRequest::PingRequest(r) => r.method.as_str(),
 ServerRequest::CreateMessageRequest(r) => r.method.as_str(),
 ServerRequest::ListRootsRequest(r) => r.method.as_str(),
 ServerRequest::CreateElicitationRequest(r) => r.method.as_str(),
 ServerRequest::GetTaskInfoRequest(r) => r.method.as_str(),
 ServerRequest::ListTasksRequest(r) => r.method.as_str(),
 ServerRequest::GetTaskResultRequest(r) => r.method.as_str(),
 ServerRequest::DeleteTaskRequest(r) => r.method.as_str(),
 ServerRequest::CustomRequest(r) => r.method.as_str(),
 }
 }
}

ts_union!(
 export type ServerNotification =
 | CancelledNotification
Expand DownExpand Up@@ -3429,7 +3449,7 @@ ts_union!(
 | CreateTaskResult
 | ListTasksResult
 | GetTaskResult
 | CancelTaskResult
 | DeleteTaskResult
 | CallToolResult
 | GetTaskPayloadResult
 | EmptyResult
Expand Down

6 changes: 5 additions & 1 deletion
crates/rmcp/src/model/meta.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -155,7 +155,7 @@ variant_extension! {
 GetTaskInfoRequest
 ListTasksRequest
 GetTaskResultRequest
CancelTaskRequest
DeleteTaskRequest
 }
}

Expand All@@ -166,6 +166,10 @@ variant_extension! {
 ListRootsRequest
 CreateElicitationRequest
 CustomRequest
 GetTaskInfoRequest
 ListTasksRequest
 GetTaskResultRequest
 DeleteTaskRequest
 }
}

Expand Down
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