Enum McpError 

pub enum McpError {
    ToolNotFound(String),
    InvalidToolNameFormat(String),
    ServerNotFound(String),
    ToolExecutionFailed {
        tool_name: String,
        server_name: String,
        error: String,
    },
    ToolExecutionError(String),
    ToolDiscoveryFailed(String),
    PromptNotFound(String),
    PromptListFailed(String),
    PromptGetFailed(String),
    SpawnFailed {
        command: String,
        reason: String,
    },
    ConnectionFailed(String),
    ServerStartupFailed(String),
    TransportError(String),
    JsonError(String),
    Other(String),
}

Variants

ToolNotFound(String)

Tool not found in the registry

InvalidToolNameFormat(String)

Invalid tool name format (should be server__tool)

ServerNotFound(String)

MCP server not found

ToolExecutionFailed

Failed to execute tool on MCP server

Fields

tool_name: String

server_name: String

error: String

ToolExecutionError(String)

Tool execution returned an error

ToolDiscoveryFailed(String)

Tool discovery failed

PromptNotFound(String)

Prompt not found in the registry

PromptListFailed(String)

Prompt listing failed

PromptGetFailed(String)

Prompt retrieval failed

SpawnFailed

Failed to spawn a stdio server process

Fields

command: String

reason: String

ConnectionFailed(String)

Server connection failed

ServerStartupFailed(String)

Server startup failed

TransportError(String)

Transport error

JsonError(String)

JSON serialization/deserialization error

Other(String)

Generic error for other cases

Trait Implementations

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, __formatter: &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<ClientInitializeError> for McpError

fn from(error: ClientInitializeError) -> Self

Converts to this type from the input type.

impl From<Error> for McpError

fn from(error: Error) -> Self

Converts to this type from the input type.

impl From<Error> for McpError

fn from(error: Error) -> Self

Converts to this type from the input type.