Enum Error 

pub enum Error {
    Validation(String),
    Memory(Error),
    Storage(Error),
    Json(Error),
    External(Error),
}

Errors produced by the MCP tool layer.

Variants

Validation(String)

Caller’s MCP tool params failed validation.

Memory(Error)

Underlying memory / orchestrator error.

Storage(Error)

Underlying storage error (exposed when the MCP tool calls into storage directly, e.g. session list).

Json(Error)

JSON (de)serialization failed at the MCP boundary.

External(Error)

Catch-all for migrating call sites that still use anyhow.

Implementations

impl Error

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

A stable discriminant for metrics / structured logs.

pub fn mcp_code(&self) -> i32

Map to a JSON-RPC error code per the MCP spec.

• -32602 Invalid params (validation failures).
• -32603 Internal error (everything else).

Trait Implementations

impl Debug for Error

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

Formats the value using the given formatter.

impl Display for Error

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

Formats the value using the given formatter.

impl Error for Error

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 Error

fn from(source: Error) -> Self

Converts to this type from the input type.

impl From<Error> for Error

fn from(source: Error) -> Self

Converts to this type from the input type.

impl From<Error> for Error

fn from(source: Error) -> Self

Converts to this type from the input type.

impl From<Error> for Error

fn from(source: Error) -> Self

Converts to this type from the input type.