Struct HandlerError 

pub struct HandlerError { /* private fields */ }

The error a ToolHandler returns from its own code.

A handler is only ever called with an already-typed, already-validated input, so it never has to report a schema mismatch. What it reports is a genuine failure of the work it does: a provider rejected the request, a precondition did not hold, and so on. This type carries a human-readable message and an optional underlying source error.

The dispatch layer wraps a returned HandlerError in ToolError::Handler, tagging it with the tool name.

Implementations

impl HandlerError

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

Builds a HandlerError from a message alone, with no underlying source.

pub fn new(source: impl Into<Box<dyn Error + Send + Sync + 'static>>) -> Self

Builds a HandlerError that wraps an underlying error as its source.

The message is taken from the source’s Display output, so the wrapped error’s own text is preserved. Use this to forward a ?-propagated error out of a handler: some_call().map_err(HandlerError::new)?.

Trait Implementations

impl Debug for HandlerError

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

Formats the value using the given formatter.

impl Display for HandlerError

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

Formats the value using the given formatter.

impl Error for HandlerError

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.