Enum Era 

pub enum Era {
    V1,
    V2,
}

Protocol era: the coarse behavioral generation a negotiated version belongs to.

The whole v2.5 milestone era-gates off this classifier. V1 covers every 2024/2025 protocol version (the compatibility layer); V2 is the 2026-07-28 stateless/Tasks/MCP-Apps generation. Unknown or unrecognized versions conservatively classify as Era::V1 so a malformed or forward-dated version string can never accidentally reach v2 behavior.

Why this derives Hash

The emit-time outputSchema validator cache in crate::server::output_validation is keyed on (Era, schema text), not on the schema text alone: under Phase 115 D-01 the SAME schema document compiles to two DIFFERENT validators depending on the era (v1 auto-detects the declared $schema dialect; v2 pins Draft 2020-12). Keying on text alone would be first-writer-wins for the process lifetime — whichever era compiled a given schema first would serve its validator to the other. Hash on this fieldless enum is what makes the tuple key possible.

Variants

V1

The 2024/2025 protocol generation (compatibility layer, current default).

V2

The 2026-07-28 protocol generation (opt-in, stateless-first).

Trait Implementations

impl Clone for Era

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Era

impl Debug for Era

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

Formats the value using the given formatter.

impl Eq for Era

impl Hash for Era

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Era

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Era