Struct Error 

pub struct Error {
    pub type: ErrorType,
    pub level: Option<Level>,
    pub fatal: Option<bool>,
    pub message: Value,
}

A failure or advisory written to stdout. fatal: true means the process is exiting with a non-zero status; fatal: false is a non-blocking warning (e.g. auto-update failed but the requested command still ran).

message is an arbitrary JSON value so producers can emit structured payloads (e.g. {"code": ..., "detail": ...}). Wrap a plain string as Value::String(...) (or use .into()) and the wire bytes stay identical to the old String-only shape.

The type field is a single-variant ErrorType enum that always serializes to "error". This is what disambiguates the untagged Output enum from a notification — Output tries Error first, and the constant type:"error" tag is what rejects every non-error wire shape.

Fields

type: ErrorType

level: Option<Level>

fatal: Option<bool>

message: Value

Trait Implementations

impl Clone for Error

fn clone(&self) -> Error

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl CommandResponse for Error

Available on crate feature mcp only.

fn into_mcp(self) -> McpResponseItem

impl Debug for Error

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Error

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for Error

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

Render message as a plain string when it’s a JSON string, otherwise as compact JSON. level and fatal are dropped — Display is the human-readable message; the metadata lives on the struct itself for callers that want it.

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 JsonSchema for Error

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 PartialEq for Error

fn eq(&self, other: &Error) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for Error

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Error