/**
 * Runtime "plugin reuse nudge" — the reactive half of the plugin-productivity
 * guidance.
 *
 * The static `promptGuidelines` on the plugin tools are injected into the system
 * prompt once at session build and never re-surface when the work actually shows
 * a reusable-facing cue. This extension closes that gap: it watches tool output
 * and turn text for the cues in {@link REUSE_NUDGES}, and when one appears it
 * attaches a matching, plugin-facing note to the *next* turn's context — an
 * ephemeral message merged into the outgoing request via the `context` hook, so
 * nothing is written into persisted history.
 *
 * Policy (see ./policy.ts for the cue table — the single source of truth):
 *   - Cues are read from `before_agent_start` (user prompt), `tool_execution_start`
 *     (tool args, e.g. content being written) and `tool_execution_end` (tool
 *     output, e.g. content being read).
 *   - First-hit arming: a matching cue arms its nudge immediately.
 *   - One note per turn, and at most once per category per session — so a cue
 *     that keeps appearing never turns into a nag.
 *   - The whole thing is gated on the autonomous-plugin-system flag
 *     (`enablePluginTools`, default off) and never blocks normal flow.
 *
 * Wired once from hoo-core (the single default composition root); the guard below
 * makes double-registration a no-op for downstreams that compose extensions
 * differently, and the static import keeps it bundled in the compiled binary.
 */
import type { ExtensionAPI } from "../../../core/extensions/types.js";
export interface PromptReactiveNudgesOptions {
    /**
     * Enablement gate. Defaults to the shared autonomous-plugin-system flag so the
     * reactive nudge and the plugin tool surface flip together. Injectable for tests.
     */
    isEnabled?: (cwd: string) => boolean;
}
/**
 * Install the runtime reuse-nudge extension. Idempotent — a second call on the
 * same `hoo` is a no-op, so composing default extensions twice is harmless.
 */
export declare function setupPromptReactiveNudges(hoo: ExtensionAPI, options?: PromptReactiveNudgesOptions): void;
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