Struct ServerState 

pub struct ServerState {
    pub registry: Registry,
    pub config: SharedServerConfig,
    pub tier_policy: TierPolicy,
    pub middleware: Vec<Arc<dyn Middleware>>,
    pub metrics: Arc<MetricsCounters>,
    pub cursor_issuer: Arc<CursorIssuer>,
}

Shared dispatch state. Listener crates own one Arc<ServerState> and hand the clone to per-connection / per-request dispatch.

SP-streamable-http §4.3: every listener holds the same Arc<Registry>, exactly one TierPolicy, exactly one middleware chain, and exactly one SharedServerConfig snapshot. The HTTP listener does not duplicate any of this — it composes the same struct.

Fields

registry: Registry

config: SharedServerConfig

tier_policy: TierPolicy

middleware: Vec<Arc<dyn Middleware>>

metrics: Arc<MetricsCounters>

SP-concurrency-baseline §5.7 — hot-path counters. Updated by the dispatch error arms below, by the per-transport accept loops (atd-server / atd-server-http), and by Phase F follow-up wiring in audit. Always present; counters default to zero.

cursor_issuer: Arc<CursorIssuer>

SP-pagination-v1 — process-wide HMAC issuer for paginated-result cursors. Built once at server startup from SharedServerConfig.cursor_signing_key and a fresh-random session_nonce. Server restart → new nonce → outstanding cursors expire (ERR_CURSOR_EXPIRED). Shared Arc so dispatch (verify- continuation) and tools (issue-next-cursor via CallContext) see the same nonce.