Struct Error 

pub struct Error {
    pub code: ErrorCode,
    pub message: String,
    pub data: Option<Value>,
}

Core MCP error type

Fields

code: ErrorCode

Error code following MCP specification

message: String

Human-readable error message

data: Option<Value>

Optional additional error data

Implementations

impl Error

pub fn new(code: ErrorCode, message: impl Into<String>) -> Self

Create a new error with the given code and message

pub fn with_data( code: ErrorCode, message: impl Into<String>, data: Value, ) -> Self

Create an error with additional data

pub fn parse_error(message: impl Into<String>) -> Self

Create a parse error

pub fn invalid_request(message: impl Into<String>) -> Self

Create an invalid request error

pub fn method_not_found(method: impl Into<String>) -> Self

Create a method not found error

pub fn invalid_params(message: impl Into<String>) -> Self

Create an invalid params error

pub fn internal_error(message: impl Into<String>) -> Self

Create an internal error

pub fn protocol_version_mismatch( client_version: &str, server_version: &str, ) -> Self

Create a protocol version mismatch error

pub fn unauthorized(message: impl Into<String>) -> Self

Create an authorization error

pub fn forbidden(message: impl Into<String>) -> Self

Create a forbidden error

pub fn resource_not_found(resource: impl Into<String>) -> Self

Create a resource not found error

pub fn tool_not_found(tool: impl Into<String>) -> Self

Create a tool not found error

pub fn validation_error(message: impl Into<String>) -> Self

Create a validation error

pub fn rate_limit_exceeded(message: impl Into<String>) -> Self

Create a rate limit exceeded error

pub fn url_elicitation_required( message: impl Into<String>, elicitations: Vec<UrlElicitationInfo>, ) -> Self

Create a URL elicitation required error (MCP 2025-11-25)

This error indicates that a request requires URL mode elicitation before it can proceed. The client should present the elicitation URLs to the user and retry after completion.

Trait Implementations

impl Clone for Error

fn clone(&self) -> Error

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Error

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Error

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for Error

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

Formats the value using the given formatter.

impl Error for Error

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

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

fn description(&self) -> &str

👎Deprecated since 1.42.0: use the Display impl or to_string()

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<CommonError> for Error

fn from(err: CommonError) -> Self

Converts to this type from the input type.

impl From<Error> for Error

fn from(err: Error) -> Self

Converts to this type from the input type.

impl From<Error> for Error

fn from(err: Error) -> Self

Converts to this type from the input type.

impl From<ValidationErrors> for Error

fn from(err: ValidationErrors) -> Self

Converts to this type from the input type.

impl PartialEq for Error

fn eq(&self, other: &Error) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for Error

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Error