Enum McpToolError 

pub enum McpToolError {
    ArgumentsMustBeObject,
    MissingField {
        field: String,
    },
    UnexpectedNull {
        field: String,
    },
    DuplicateField {
        field: String,
    },
    DecodeField {
        field: String,
        message: String,
    },
    UnknownField {
        field: String,
    },
    InvalidFieldValue {
        field: String,
        value: String,
    },
    Validation {
        message: String,
        details: Vec<Value>,
    },
    InvalidToolOutput {
        name: String,
        message: String,
    },
    Conversion {
        message: String,
    },
    Handler {
        message: String,
    },
    InvalidSchema {
        label: String,
        message: String,
    },
    DuplicateTool {
        name: String,
    },
    UnknownTool {
        name: String,
    },
    DuplicateResource {
        uri: String,
    },
    UnknownResource {
        uri: String,
    },
    DuplicatePrompt {
        name: String,
    },
    UnknownPrompt {
        name: String,
    },
}

Typed setup, decoding, validation, and handler error used by MCP helpers.

Variants

ArgumentsMustBeObject

Tool arguments were omitted or supplied as a non-object JSON value.

MissingField

A required tool argument field is missing.

Fields

field: String

UnexpectedNull

A non-nullable tool argument field was supplied as JSON null.

Fields

field: String

DuplicateField

A field was supplied by multiple accepted wire names.

Fields

field: String

DecodeField

A field could not be decoded into its typed Rust value.

Fields

field: String

message: String

UnknownField

A raw argument field remains after typed decoding finishes.

Fields

field: String

InvalidFieldValue

A field value is outside the accepted schema or enum values.

Fields

field: String

value: String

Validation

Validation rejected a value or metadata object.

Fields

message: String

details: Vec<Value>

InvalidToolOutput

A handler returned structured content that does not match its output schema.

Fields

name: String

message: String

Conversion

A value conversion failed.

Fields

message: String

Handler

A handler returned an application-level failure.

Fields

message: String

InvalidSchema

A schema or metadata definition is invalid.

Fields

label: String

message: String

DuplicateTool

A tool with the same name is already registered.

Fields

name: String

UnknownTool

A requested tool name is not registered.

Fields

name: String

DuplicateResource

A resource with the same URI is already registered.

Fields

uri: String

UnknownResource

A requested resource URI is not registered.

Fields

uri: String

DuplicatePrompt

A prompt with the same name is already registered.

Fields

name: String

UnknownPrompt

A requested prompt name is not registered.

Fields

name: String

Implementations

impl McpToolError

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

Stable machine-readable error kind used in MCP structured error content.

pub fn to_structured_value(&self) -> Value

Build the structured_content.error object for this typed MCP error.

pub fn missing_field(field: impl Into<String>) -> Self

Build a missing-field error.

pub fn decode(field: impl Into<String>, message: impl Into<String>) -> Self

Build a field decoding error.

pub fn invalid_field_value( field: impl Into<String>, value: impl Into<String>, ) -> Self

Build an invalid field value error.

pub fn validation(message: impl Into<String>) -> Self

Build a validation error with a text message.

pub fn validation_details( details: impl IntoIterator<Item = impl Into<String>>, ) -> Self

Build a validation error from text details.

pub fn validation_structured_details( message: impl Into<String>, details: impl IntoIterator<Item = Value>, ) -> Self

Build a validation error with machine-readable structured details.

pub fn conversion(message: impl Into<String>) -> Self

Build a conversion error.

pub fn invalid_tool_output( name: impl Into<String>, message: impl Into<String>, ) -> Self

Build an invalid tool-output error.

pub fn handler(message: impl Into<String>) -> Self

Build a handler error.

pub fn invalid_schema( label: impl Into<String>, message: impl Into<String>, ) -> Self

Build an invalid schema or metadata error.

pub fn duplicate_tool(name: impl Into<String>) -> Self

Build a duplicate tool registration error.

pub fn duplicate_resource(uri: impl Into<String>) -> Self

Build a duplicate resource registration error.

pub fn unknown_resource(uri: impl Into<String>) -> Self

Build an unknown resource lookup error.

pub fn duplicate_prompt(name: impl Into<String>) -> Self

Build a duplicate prompt registration error.

pub fn unknown_prompt(name: impl Into<String>) -> Self

Build an unknown prompt lookup error.

Trait Implementations

impl Clone for McpToolError

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for McpToolError

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

Formats the value using the given formatter.

impl Display for McpToolError

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

Formats the value using the given formatter.

impl Eq for McpToolError

impl Error for McpToolError

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 PartialEq for McpToolError

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for McpToolError