Struct McpError 

pub struct McpError {
    pub code: ErrorCode,
    pub message: String,
    pub details: Option<Value>,
    pub retryable: bool,
}

Structured error response for MCP tools.

Fields

code: ErrorCode

Machine-readable error code

message: String

Human-readable error message

details: Option<Value>

Additional context (e.g., matched session IDs for ambiguous prefix)

retryable: bool

Whether the operation can be retried

Implementations

impl McpError

pub fn session_not_found(session_id: &str) -> Self

pub fn ambiguous_prefix(prefix: &str, matches: Vec<String>) -> Self

pub fn invalid_event_index(session_id: &str, index: usize, max: usize) -> Self

pub fn invalid_cursor(cursor: &str) -> Self

pub fn invalid_parameter(param_name: &str, reason: &str) -> Self

pub fn internal_error(message: String) -> Self

Trait Implementations

impl Debug for McpError

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for McpError

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for McpError

fn fmt(&self, f: &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(err: Error) -> Self

Converts to this type from the input type.

impl JsonSchema for McpError

fn schema_name() -> Cow<'static, str>

The name of the generated JSON Schema.

fn schema_id() -> Cow<'static, str>

Returns a string that uniquely identifies the schema produced by this type.

fn json_schema(generator: &mut SchemaGenerator) -> Schema

Generates a JSON Schema for this type.

fn inline_schema() -> bool

Whether JSON Schemas generated for this type should be included directly in parent schemas, rather than being re-used where possible using the $ref keyword.

impl Serialize for McpError

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

where __S: Serializer,

Serialize this value into the given Serde serializer.