/**
 * dangling-reference — a served capability whose declared argument ground
 * has left the window and was not re-established.
 *
 * Pattern: pure function over three name sets; the closure check.
 * Role:    the decidable fragment of "does everything the model is being
 *          offered still have its evidence in reach?". The measured
 *          failure: a `whats_here` result carrying the valid ids was
 *          evicted by the window strategy while the tool that FIRES at
 *          those ids stayed on the wire; the model assembled a plausible
 *          id from memory and was refused. The drop already speaks
 *          (9.57.0, `WindowRecord.droppedObservations`); this makes the
 *          next composition answerable for it.
 *
 * DECLARED, NEVER INFERRED. The library cannot know that one tool's
 * arguments come from another tool's results — only the author does. The
 * edge is `Tool.argumentsFrom`, stamped at definition; a tool that
 * declares nothing is never this check's subject, which is the whole
 * zero-delta story.
 *
 * THE TWO FENCES, stated because they are the check's honesty:
 * - A ground that was NEVER dropped is silent even with no result in the
 *   window — the model simply has not called it yet, and offering the
 *   dependent tool ahead of that is legitimate sequencing, not a defect.
 * - A re-fetched ground (a fresh result present in the window) is silent
 *   however many drops preceded it — the evidence is back in reach.
 * The defect is exactly the third state: WAS grounded, evidence evicted,
 * nothing re-established, capability still offered.
 */
import type { ContextError } from '../finding/types.js';
/** One served tool and the grounds its author declared. */
export interface ServedGroundedTool {
    readonly name: string;
    /** `Tool.argumentsFrom` — tool names whose results ground this one's arguments. */
    readonly argumentsFrom: readonly string[];
}
/**
 * Compare the served tools' declared grounds against what the window has
 * dropped and what it currently holds.
 *
 * @param droppedResults tool names whose RESULTS have left the window this
 *   run (union of `WindowRecord.droppedObservations`).
 * @param presentResults tool names with a result currently IN the window.
 */
export declare function danglingReferencesOf(servedTools: readonly ServedGroundedTool[], droppedResults: ReadonlySet<string>, presentResults: ReadonlySet<string>, epoch: number): readonly ContextError[];