Enum McpTransportError 

pub enum McpTransportError {
    StaleSession {
        status: u16,
    },
    TransportClosed,
    RecoveryPending,
}

Transport-level failures that require reconnecting and re-running the MCP handshake. The client may retry only when the request is known not to have been written; failures after a possible write are surfaced without replay. Distinct from a genuine tool/application error, which is always reported as-is and never retried.

Variants

StaleSession

The server no longer recognizes our session (typically after it restarted). Surfaced from HTTP 404/410 responses.

Fields

status: u16

TransportClosed

The underlying stream/connection dropped before a response arrived (e.g. SSE EOF or connection reset).

RecoveryPending

A recovery was published after this request entered the transport but before it crossed the concrete writer boundary. The caller must wait for that recovery instead of treating this as a connection failure.

Trait Implementations

impl Debug for McpTransportError

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

Formats the value using the given formatter.

impl Display for McpTransportError

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

Formats the value using the given formatter.

impl Error for McpTransportError

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.