Enum Subject 

pub enum Subject {
    Endpoint,
    Model,
}

What a step is actually measuring — and therefore whether its answer survives a relay.

This is the distinction that matters to anyone probing an endpoint that is not the vendor’s own. Ask “is this endpoint’s error envelope well formed” through three hops and you have measured the hop nearest you; ask “does the text coming back read like the model it claims to be” and you have measured whatever generated the tokens, however many hops away it sits, because the tokens themselves are the evidence.

A marketplace verifying a seller reachable only through its own gateway must run Subject::Model steps and skip the rest: the endpoint steps would all be describing the gateway, identically for every seller, at the cost of a real request each. Running the whole suite there is not merely wasteful — the contract steps deliberately send malformed and unauthenticated requests, which is exactly the traffic pattern that gets a seller’s upstream account flagged for abuse.

Variants

Endpoint

The HTTP endpoint itself: its contract, its error shapes, its headers, and the usage numbers it reports. Behind a relay, these describe the relay.

Model

The model generating the text. Survives any number of relay hops.

Trait Implementations

impl Clone for Subject

fn clone(&self) -> Subject

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Subject

impl Debug for Subject

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

Formats the value using the given formatter.

impl Eq for Subject

impl PartialEq for Subject

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Subject