/**
 * /plugin — marketplace add/list + plugin install/list/remove (the human path).
 *
 * `/plugin` installs plugins from marketplaces (a git repo or local dir with a
 * native `.agents-plugin/marketplace.json`, Claude `.claude-plugin/marketplace.json`,
 * or Copilot-style `.github/marketplace.json` index). Installed plugins are placed
 * at the chosen scope — `~/.agents/plugins/<name>` for `user`, or
 * `<cwd>/.agents/plugins/<name>` for `project` — and loaded by the plugin loader
 * after a reload. `install` asks which, since a human is right here to answer;
 * the autonomous tool reads the `pluginInstallScope` setting instead.
 *
 * Adding a marketplace is the human trust boundary and stays here; the shared
 * mechanics (discovery, install, remove, the bundled default marketplace) live in
 * `core/extensions/plugins/install.ts` so this command and the model-facing
 * lifecycle tools never drift.
 *
 *   /plugin marketplace add <git-url|path>
 *   /plugin marketplace list
 *   /plugin marketplace refresh     re-fetch every cached index now
 *   /plugin list                     list available plugins across marketplaces
 *   /plugin install <name> [--scope user|project]
 *   /plugin remove <name>
 *   /plugin trust [list]             allow repo-committed plugins to run code here
 *   /plugin untrust
 *   /plugin publish <name> [--to <marketplace-dir>]
 *
 * `publish` is the human end of the publish lane (§3.2). The model can package a
 * plugin — gates, README, index entry — but never publish it, because an agent
 * that can push executable code into a marketplace other agents install from
 * unattended is a supply-chain compromise primitive. So the last step is a
 * command a person types, and even then it stops at the machine boundary: with
 * `--to` it copies the plugin into a local marketplace checkout and updates that
 * index, leaving an uncommitted diff to review. Committing and opening the PR
 * stay manual.
 */
import type { ExtensionAPI } from "../../core/extensions/types.js";
export declare function setupMarketplace(hoo: ExtensionAPI): void;
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