/** Agent-preset vocabulary shared by discovery, mounting, and consumers. */
/**
 * Where a preset's composition came from. A `system` preset ships with the
 * deployment; a `user` preset was authored locally, by a person or by an
 * agent, and therefore carries the same trust as shell access.
 */
export type PresetTrust = 'system' | 'user';
/**
 * Ids a preset directory may use.
 *
 * The id becomes a path segment, so this is a containment boundary rather than
 * a style rule: `..`, a separator, or an absolute-looking name would place the
 * composition outside the root the deployment authorised. Discovery shares it:
 * a directory whose name no copy could ever claim is not a preset slot.
 */
export declare const PRESET_ID: RegExp;
/** One preset directory that carries a mountable agent composition. */
export interface AgentPreset {
    /** Stable identifier; the preset directory's name. */
    readonly id: string;
    /** Trust recorded from the root this preset was discovered under. */
    readonly trust: PresetTrust;
    /** Absolute path of the preset's agent composition file. */
    readonly path: string;
    /** Display name from the preset's own metadata; absent falls back to {@link id}. */
    readonly name?: string;
    /** One sentence on what this preset is for, when it published one. */
    readonly description?: string;
    /** Declared position within its group; absent sorts after those that declare one. */
    readonly order?: number;
    /**
     * Why this preset cannot compose a session, absent when it can. A broken
     * preset stays on the roster — hiding it would leave its directory blocking
     * the id with nothing to see or delete — but every mounting path refuses it
     * up front with this reason instead of failing deep inside the loader.
     */
    readonly broken?: string;
}
/** One directory scanned for preset subdirectories. */
export interface PresetRoot {
    /** Directory holding one subdirectory per preset; a leading `~` expands. */
    path: string;
    /** Trust recorded on every preset discovered under this root. */
    trust: PresetTrust;
}
/** Plugin config: which preset is the default, and where presets live. */
export interface Config {
    /** Preset id mounted when a caller names none. Missing at mount time fails loud. */
    default: string;
    /** Scanned roots in precedence order; an earlier root wins a duplicate id. */
    roots: PresetRoot[];
    /**
     * Append the harness home's `USER_PRESET_DIR` as a `user` root, after every
     * configured root. False mounts a roster over `roots` alone.
     */
    includeUserRoot: boolean;
}
/**
 * No configured root supplies the requested preset.
 *
 * Separate from a mount failure because the two mean different things to a
 * caller: an unknown id is a bad request, while an unusable composition is a
 * broken preset the deployment must fix.
 */
export declare class UnknownPresetError extends Error {
    /** The id that was requested. */
    readonly presetId: string;
    /** Ids the roster does supply, for the caller to offer instead. */
    readonly available: readonly string[];
    constructor(
    /** The id that was requested. */
    presetId: string, 
    /** Ids the roster does supply, for the caller to offer instead. */
    available: readonly string[]);
}
/** A preset exists but its composition cannot be installed. */
export declare class PresetMountError extends Error {
    /** The preset whose composition failed. */
    readonly presetId: string;
    /** Why it failed, without this package's own message prefix. */
    readonly reason: string;
    constructor(
    /** The preset whose composition failed. */
    presetId: string, 
    /** Why it failed, without this package's own message prefix. */
    reason: string, options?: ErrorOptions);
}
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