Enum ProtocolError

pub enum ProtocolError {
    InvalidJsonRpc {
        reason: String,
    },
    UnsupportedVersion {
        version: String,
        supported: Vec<String>,
    },
    MessageIdMismatch {
        expected: String,
        actual: String,
    },
    UnexpectedMessageType {
        expected: String,
        actual: String,
    },
    MissingField {
        field: String,
        message_type: String,
    },
    InvalidMethod {
        method: String,
    },
    ServerError {
        code: i32,
        message: String,
    },
    StateViolation {
        reason: String,
    },
    InitializationFailed {
        reason: String,
    },
    NotInitialized {
        reason: String,
    },
    InvalidResponse {
        reason: String,
    },
    InvalidConfig {
        reason: String,
    },
    TimeoutError {
        operation: String,
        timeout: Duration,
    },
    RequestFailed {
        reason: String,
    },
    RequestTimeout {
        timeout: Duration,
    },
}

Protocol-level errors related to MCP message handling.

These errors occur when messages don’t conform to the MCP specification or when protocol violations are detected.

Variants

InvalidJsonRpc

Invalid JSON-RPC message format

Fields

reason: String

UnsupportedVersion

Unsupported MCP protocol version

Fields

version: String

supported: Vec<String>

MessageIdMismatch

Message ID mismatch in request/response correlation

Fields

expected: String

actual: String

UnexpectedMessageType

Unexpected message type received

Fields

expected: String

actual: String

MissingField

Required field missing from message

Fields

field: String

message_type: String

InvalidMethod

Invalid method name for MCP operation

Fields

method: String

ServerError

Server returned an error response

Fields

code: i32

message: String

StateViolation

Protocol state violation (e.g., calling method before initialization)

Fields

reason: String

InitializationFailed

Protocol initialization failed

Fields

reason: String

NotInitialized

Operation attempted before protocol initialization

Fields

reason: String

InvalidResponse

Invalid or malformed response

Fields

reason: String

InvalidConfig

Configuration error in protocol settings

Fields

reason: String

TimeoutError

Operation timeout

Fields

operation: String

timeout: Duration

RequestFailed

Request failed

Fields

reason: String

RequestTimeout

Request timed out

Fields

timeout: Duration

Trait Implementations

impl Clone for ProtocolError

fn clone(&self) -> ProtocolError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ProtocolError

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

Formats the value using the given formatter.

impl Display for ProtocolError

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

Formats the value using the given formatter.

impl Error for ProtocolError

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<ProtocolError> for McpError

fn from(source: ProtocolError) -> Self

Converts to this type from the input type.