Struct PolicyRefusal 

#[non_exhaustive]
pub struct PolicyRefusal { /* private fields */ }

A RequestPolicy’s refusal of one outbound request.

Residual: the message is authored by the policy, not by this phase

The message travels back to the MCP client. It is chosen by the policy implementation, so the toolkit cannot mechanically constrain it — a policy that interpolates the rejected value into its own message creates exactly the value-echo leak every toolkit-authored refusal in this phase avoids (T-128-40). Supply a FIXED string. Do not put a request value, a resolved path, or a credential in it.

Implementations

impl PolicyRefusal

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

Refuse the request with a fixed message.

The message must not carry any byte of the rejected request — see the type documentation for why the toolkit cannot enforce that for you.

pub fn message(&self) -> &str

The policy-supplied message, verbatim.

Trait Implementations

impl Clone for PolicyRefusal

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 PolicyRefusal

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

Formats the value using the given formatter.

impl Display for PolicyRefusal

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

Formats the value using the given formatter.

impl Eq for PolicyRefusal

impl Error for PolicyRefusal

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 PolicyRefusal

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for PolicyRefusal