Struct McpError 

pub struct McpError {
    pub code: ErrorCode,
    pub message: String,
    pub suggestion: Option<String>,
}

An error type designed for MCP tool responses.

Serializes to JSON with code, message, and an optional suggestion. The suggestion is aimed at the LLM caller — it tells the model how to retry or what parameter to fix, reducing round-trips.

Fields

code: ErrorCode

message: String

suggestion: Option<String>

Implementations

impl McpError

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

Create an error with an auto-generated suggestion based on the error code.

pub fn with_suggestion(self, suggestion: impl Into<String>) -> Self

Override the default suggestion with a context-specific one.

pub fn from_io_error(err: &Error, context: &str) -> Self

Maps a filesystem std::io::Error to an McpError, preserving the distinction between a missing file and a permission problem instead of collapsing both to ErrorCode::FileNotFound.

Trait Implementations

impl Clone for McpError

fn clone(&self) -> McpError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

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, 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

Converts a hyperdb_api::Error into an McpError by inspecting the structured variant first, falling back to message-substring classification for variants whose payload is just a String.

fn from(err: Error) -> Self

Converts to this type from the input type.

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.