/**
 * Read-only "is this capability already satisfied on this machine?"
 * detector for the capability catalog (`peaks capability status` /
 * `peaks capabilities --source ...`).
 *
 * `getInstalledCapabilityIds()` returned `[]` unconditionally, so the
 * catalog could never report anything as installed. This module answers
 * the question from evidence that already exists on disk — no install
 * side effect, no network, no subprocess:
 *
 *   - `everything-claude-code.*` — satisfied when the ECC agents are readable,
 *     i.e. `~/.peaks/agents/ecc/` holds at least one agent (landed by
 *     `peaks ecc install` from the `ecc-universal` dependency).
 *   - a source that maps to an npm package — satisfied when that package
 *     (or its `.bin` shim) is present in the project's `node_modules`.
 *
 * Every probe is fail-soft: a throw degrades to "not installed" so the
 * catalog never breaks because a probe failed.
 */
export type InstalledCapabilityProbe = {
    /** Project whose `node_modules` is probed. */
    readonly projectRoot: string;
    /** Override for tests; defaults to `<projectRoot>/node_modules`. */
    readonly nodeModulesDir?: string;
    /** Override for tests; defaults to a live probe of the materialized copy. */
    readonly eccAgentsAvailable?: boolean;
};
/**
 * Return the capabilityIds whose acquisition is already satisfied.
 * Sorted + de-duplicated so the JSON envelope is stable across runs.
 */
export declare function detectInstalledCapabilityIds(probe: InstalledCapabilityProbe): string[];