Struct RpcError 

pub struct RpcError {
    pub code: i64,
    pub data: Option<Value>,
    pub message: String,
}

Latest MCP Protocol 2026_07_28 RpcError

JSON schema

{
 "type": "object",
 "required": [
   "code",
   "message"
 ],
 "properties": {
   "code": {
     "description": "The error type that occurred.",
     "type": "integer"
   },
   "data": {
     "description": "Additional information about the error. The value of this member is defined by the sender (e.g. detailed error information, nested errors etc.)."
   },
   "message": {
     "description": "A short description of the error. The message SHOULD be limited to a concise single sentence.",
     "type": "string"
   }
 }
}

Fields

code: i64

The error type that occurred.

data: Option<Value>

Additional information about the error. The value of this member is defined by the sender (e.g. detailed error information, nested errors etc.).

message: String

A short description of the error. The message SHOULD be limited to a concise single sentence.

Implementations

impl RpcError

pub fn new( error_code: RpcErrorCodes, message: String, data: Option<Value>, ) -> Self

pub fn method_not_found() -> Self

pub fn invalid_params() -> Self

pub fn invalid_request() -> Self

pub fn internal_error() -> Self

pub fn parse_error() -> Self

pub fn with_message<T: Into<String>>(self, message: T) -> Self

pub fn with_data(self, data: Option<Value>) -> Self

Trait Implementations

impl Clone for RpcError

fn clone(&self) -> RpcError

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for RpcError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for RpcError

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for RpcError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Error for RpcError

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl From<CallToolError> for RpcError

Converts a CallToolError into a RpcError.

The conversion creates an internal error variant of RpcError and attaches the string representation of the original CallToolError as a message.

fn from(value: CallToolError) -> Self

Converts to this type from the input type.

impl From<MissingRequiredClientCapabilityError> for RpcError

fn from(value: MissingRequiredClientCapabilityError) -> Self

Converts to this type from the input type.

impl From<RpcError> for MessageFromServer

fn from(value: RpcError) -> Self

Converts to this type from the input type.

impl From<RpcError> for MessageFromClient

fn from(value: RpcError) -> Self

Converts to this type from the input type.

impl From<UnsupportedProtocolVersionError> for RpcError

fn from(value: UnsupportedProtocolVersionError) -> Self

Converts to this type from the input type.

impl FromStr for RpcError

type Err = RpcError

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<Self, Self::Err>

Parses a string s to return a value of this type.

impl Serialize for RpcError

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.