Enum McpError

pub enum McpError {
    Transport(String),
    Protocol(String),
    Serialization(Error),
    InvalidUri(String),
    ToolNotFound(String),
    ResourceNotFound(String),
    PromptNotFound(String),
    Connection(String),
    Authentication(String),
    Validation(String),
    Io(Error),
    Url(ParseError),
    Http(String),
    WebSocket(String),
    SchemaValidation(String),
    Timeout(String),
    Cancelled(String),
    Internal(String),
}

The main error type for the MCP SDK

Variants

Transport(String)

Transport-related errors (connection, I/O, etc.)

Protocol(String)

Protocol-level errors (invalid messages, unexpected responses, etc.)

Serialization(Error)

JSON serialization/deserialization errors

InvalidUri(String)

Invalid URI format or content

ToolNotFound(String)

Requested tool was not found

ResourceNotFound(String)

Requested resource was not found

PromptNotFound(String)

Requested prompt was not found

Connection(String)

Connection-related errors

Authentication(String)

Authentication/authorization errors

Validation(String)

Input validation errors

Io(Error)

I/O errors from the standard library

Url(ParseError)

URL parsing errors

Http(String)

HTTP-related errors when using HTTP transport

WebSocket(String)

WebSocket-related errors when using WebSocket transport

SchemaValidation(String)

JSON Schema validation errors

Timeout(String)

Timeout errors

Cancelled(String)

Cancellation errors

Internal(String)

Internal errors that shouldn’t normally occur

Implementations

impl McpError

pub fn transport<S: Into<String>>(message: S) -> Self

Create a new transport error

pub fn protocol<S: Into<String>>(message: S) -> Self

Create a new protocol error

pub fn validation<S: Into<String>>(message: S) -> Self

Create a new validation error

pub fn connection<S: Into<String>>(message: S) -> Self

Create a new connection error

pub fn internal<S: Into<String>>(message: S) -> Self

Create a new internal error

pub fn io(err: Error) -> Self

Create a new IO error from std::io::Error

pub fn serialization(err: Error) -> Self

Create a new serialization error from serde_json::Error

pub fn timeout<S: Into<String>>(message: S) -> Self

Create a new timeout error

pub fn is_recoverable(&self) -> bool

Check if this error is recoverable

pub fn category(&self) -> &'static str

Get the error category for logging/metrics

Trait Implementations

impl Debug for McpError

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

Formats the value using the given formatter.

impl Display for McpError

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

Formats the value using the given formatter.

impl Error for McpError

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<Error> for McpError

fn from(source: Error) -> Self

Converts to this type from the input type.

impl From<Error> for McpError

fn from(source: Error) -> Self

Converts to this type from the input type.

impl From<Error> for McpError

fn from(err: Error) -> Self

Converts to this type from the input type.

impl From<Error> for McpError

fn from(err: Error) -> Self

Converts to this type from the input type.

impl From<ParseError> for McpError

fn from(source: ParseError) -> Self

Converts to this type from the input type.