Enum McpEventKind 

pub enum McpEventKind {
    Init,
    Message,
    Progress,
    Lagged,
    Heartbeat,
}

Discriminator for the per-session SSE event stream. The wire event: field is rendered from the kebab-case spelling of each variant — kept in lock-step with the constants below so handlers + clients agree on the literal string.

Variants:

• Init — emitted once when a subscriber connects (event: init). The payload includes the session id + tenant + connect ts.
• Message — JSON-RPC notifications/message from the P4 bridge (event: message).
• Progress — JSON-RPC notifications/progress from P3 long-running tool handlers (event: progress).
• Lagged — synthetic event emitted by the GET handler when a subscriber falls past the broadcast buffer’s capacity, OR when a Last-Event-ID is older than the buffer’s oldest retained event (event: lagged). Carries {dropped: <count>} so clients know whether to resync state.
• Heartbeat — synthetic event emitted by the heartbeat tick to keep proxies + clients aware the stream is alive (event: heartbeat).

Variants

Init

event: init — subscriber-connect handshake.

Message

event: message — JSON-RPC notifications/message.

Progress

event: progress — JSON-RPC notifications/progress.

Lagged

event: lagged — subscriber drifted past the buffer.

Heartbeat

event: heartbeat — periodic liveness ping.

Implementations

impl McpEventKind

pub fn as_str(&self) -> &'static str

Wire-format event: string. Kept in lock-step with the constants above so the GET handler + clients agree on the literal.

Trait Implementations

impl Clone for McpEventKind

fn clone(&self) -> McpEventKind

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for McpEventKind

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

Formats the value using the given formatter.

impl PartialEq for McpEventKind

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for McpEventKind

impl Eq for McpEventKind

impl StructuralPartialEq for McpEventKind