/**
 * innerRunRecords — the record a tool keeps of its OWN run.
 *
 * Pattern: bounded LRU store + a structural join key (a registry symbol).
 * Role:    the one place the outer trace and an inner trace are allowed to
 *          know about each other. Nothing here executes, renders, or
 *          formats — it holds records and hands them back by id.
 *
 * THE GAP
 * ───────
 * `inspect_tool_call` resolves a tool call end to end and then stops at a
 * wall: *"⚠ boundary: what happened INSIDE the tool is not traced."* That
 * marker is honest for a tool that calls someone else's system. It is
 * needlessly honest for a tool that IS a footprintjs flowchart — that tool
 * recorded every stage it ran, and then threw the recording away, because
 * nobody was holding it.
 *
 * So: hold it. `flowchartAsTool({ keepRecord: true })` keeps each
 * invocation's inner record here, keyed by the `toolCallId` the outer run
 * already uses to name that call. One id, two levels — which is what makes
 * the descent a lookup rather than a correlation puzzle.
 *
 * WHY BOUNDED, AND WHY LRU
 * ────────────────────────
 * A retained snapshot is retained memory. An agent that runs a chart tool
 * on every turn for a week would pin every one of those runs, and the
 * failure would look like a leak rather than like a feature. So the store
 * has a cap (default {@link DEFAULT_INNER_RUN_LIMIT}), drops the
 * least-recently-USED record when it overflows, and COUNTS the drops —
 * because "we kept the last 20 of 340" is an answer a debugging session can
 * act on, and a silently missing row is not.
 *
 * Reading refreshes recency on purpose: a record under active investigation
 * (three drills into one inner run) must not be the next one evicted by a
 * turn happening beside it.
 *
 * THE JOIN KEY
 * ────────────
 * The store rides the `Tool` object under a registry symbol rather than a
 * named property: a `Tool` is a consumer-authored shape, and a plain name
 * like `innerRuns` would be a name a consumer's own tool could collide
 * with. `Symbol.for` (registry, not unique-per-module) because this package
 * ships CJS *and* ESM — two module instances of this file must agree on the
 * key or a tool built in one half would be invisible to the other.
 */
import type { ControlDepLookup } from 'footprintjs/trace';
/**
 * How many invocations one tool keeps by default.
 *
 * Twenty is a debugging window, not an archive: enough that "the call three
 * turns ago" is still there, small enough that a long-lived server holding
 * one store per chart tool has a ceiling it can multiply out. Raise it with
 * `keepRecordLimit` when the sessions are long and the charts are small.
 */
export declare const DEFAULT_INNER_RUN_LIMIT = 20;
/** How the inner run finished, from the wrapping tool's point of view. */
export type InnerRunOutcome = 'ok' | 'error' | 'paused';
/**
 * One retained inner run — the evidence of a single tool invocation.
 *
 * `recording` is deliberately the `{ snapshot, structure }` shape
 * `recordRun(...).toRecording()` produces, so the same `openRecording`
 * adapter opens it. It is held BY REFERENCE (no clone): the inner executor
 * is discarded after the call, so nothing else can mutate it, and cloning a
 * snapshot per invocation would be the retention cost twice over.
 */
export interface InnerRunRecord {
    /** The outer run's id for this call — the one `inspect_tool_call` takes. */
    readonly toolCallId: string;
    /** The wrapping tool's name, for messages that name what was descended into. */
    readonly toolName: string;
    /** How the invocation ended. A failed inner run is still a complete record. */
    readonly outcome: InnerRunOutcome;
    /** Committed steps in the inner run — the size hint the descent line prints. */
    readonly steps: number;
    /**
     * `{ snapshot, structure }` — absent only when capture itself failed, in
     * which case {@link problem} says why.
     */
    readonly recording?: {
        readonly snapshot: unknown;
        readonly structure?: unknown;
    };
    /**
     * The inner run's control-dependence lookup.
     *
     * A serialized recording can never carry one (a function does not
     * serialize — see `openRecording`). This record is LIVE in process, so it
     * can: the wrapping tool attaches a fresh `controlDepRecorder()` per
     * invocation, and inner slices therefore show the `[control: rule]` edges
     * that a reopened JSON recording has to say ⚠ about.
     */
    readonly controlDeps?: ControlDepLookup;
    /** The inner run's narrative lines, when the chart had a narrative attached. */
    readonly narrative?: readonly string[];
    /**
     * Why there is no `recording`.
     *
     * A record that could not be captured is filed anyway, carrying the
     * reason. The alternative — no row at all — is indistinguishable from a
     * call that was never made, which is the one thing a trace must never be
     * ambiguous about.
     */
    readonly problem?: string;
}
/** A retained record, named without opening it. */
export interface InnerRunSummary {
    readonly toolCallId: string;
    readonly toolName: string;
    readonly outcome: InnerRunOutcome;
    readonly steps: number;
}
/** Read side — what the trace tools are given. */
export interface InnerRunLookup {
    /** The record for one tool call, or undefined (never kept, or evicted). */
    get(toolCallId: string): InnerRunRecord | undefined;
    /**
     * Every record still held, least-recently-used first. Used for the
     * unknown-id correction, so the model is told which calls it CAN descend
     * into rather than only which one it cannot.
     */
    list(): readonly InnerRunSummary[];
    /** Records dropped to stay under the cap. Non-zero means "ask sooner". */
    readonly dropped: number;
    /** The cap in force (the smallest, when several stores are merged). */
    readonly limit: number;
}
/** Write side — what the wrapping tool holds. */
export interface InnerRunStore extends InnerRunLookup {
    /** File one invocation's record, evicting the least-recently-used if full. */
    keep(record: InnerRunRecord): void;
}
/**
 * The key an inner-record store rides on a `Tool`.
 *
 * Registry symbol, not a unique one: this package ships CJS and ESM, and a
 * tool built through one entry point must be readable through the other.
 */
export declare const INNER_RUN_RECORDS: unique symbol;
/** A `Tool` (or anything) that carries retained inner runs. */
export interface KeepsInnerRuns {
    readonly [INNER_RUN_RECORDS]: InnerRunLookup;
}
/**
 * Read the inner-run store off a candidate, or undefined when it carries
 * none. Structural and total — a plain tool, a string, `null` all answer
 * "no records" rather than throwing.
 */
export declare function innerRunsOf(candidate: unknown): InnerRunLookup | undefined;
/**
 * A bounded LRU store of inner runs.
 *
 * @param limit maximum retained records (clamped to at least 1 — a store
 *              that keeps nothing is `keepRecord: false`, and saying so with
 *              a zero would be config that lies).
 */
export declare function innerRunStore(limit?: number): InnerRunStore;
/**
 * One lookup over several stores — an agent may mount more than one chart
 * tool, and the model asking "descend into call c3" should not have to know
 * which tool produced c3.
 *
 * Returns undefined for an empty list so callers can spread the field
 * conditionally rather than passing an empty lookup that answers "nothing
 * was kept" when the truth is "nothing keeps anything".
 */
export declare function mergeInnerRuns(lookups: readonly InnerRunLookup[]): InnerRunLookup | undefined;