/**
 * Host-neutral adapter contract (ADR 0001). Core modules depend on this
 * interface only — never on a specific host's package (e.g. pi). This file
 * MUST import nothing from any host package.
 */
/**
 * Declares how (or whether) a host can deliver a parent notification.
 * Core MUST branch on this rather than assuming an interrupting channel
 * exists — see `NudgeManager` for the capability gate.
 */
export type NudgeCapability = "steer" | "followUp" | "unsupported";
export interface HostAdapter {
    /** Declared once at construction; core must branch on this, never assume "steer". */
    readonly nudgeCapability: NudgeCapability;
    /** Deliver a parent notification using the host's best channel for its declared capability. */
    notifyParent(text: string): Promise<void>;
    /** Non-interrupting UI notification (toast/status line). */
    notify(message: string, level?: "info" | "warn" | "error"): void;
    /** Host-resolved config directory (pi: PI_CODING_AGENT_DIR ?? ~/.pi/agent). */
    readonly configDir: string;
    /**
     * Optional: resolve a model's REAL context window (tokens) from the host's
     * model registry, used at spawn to stamp `record.contextWindow` so the
     * health bar's denominator reflects long-context models (e.g. 1M) rather
     * than the conservative static table. An adapter that omits this is treated
     * as returning `undefined` (static-table fallback). MUST never throw into
     * the spawn path — a miss or registry error returns `undefined`.
     */
    lookupContextWindow?(provider: string | undefined, model: string | undefined): number | undefined;
}
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