agentfootprint/dist/types/hosting/turnArtifacts.d.ts

The explainable agent framework — backtrack a wrong answer to the exact context that caused it (evidence, not guesses). Built on footprintjs.

/**
 * hosting/turnArtifacts — the artifact hand-over a turn gives its host, and
 * how long it lives.
 *
 *   turnArtifacts: async (turn) => {
 *     if (turn.bound) story = await turn.artifacts.put({ kind: 'story/turn', mediaType, data });
 *   },
 *
 * `standingAgent` opens one per turn (`openTurnArtifacts`), awaits the host's
 * `HostReply.turnArtifacts` hook with it and then `drain()` — both BOUNDED by
 * the composer (`turnArtifactsTimeoutMs`, the request's signal) — and finally
 * `revoke()`s it before the reply's terminal. This module owns that lifetime
 * and the failures it can see; the scope, the bound and the record are the
 * composer's.
 *
 * ── Why the hand-over has a lifetime at all ──────────────────────────────────
 * The scope never widens — the binding closes over one tuple — so a late write
 * can only ever land in the same person's scope. What a late write breaks is
 * the RECORD: the binding's facts are delivered on the serving agent's
 * dispatcher, and by then the agent may be running somebody else's turn (the
 * shared shape), a stopped instance (the pool evicted the lane), or the next
 * turn of the same conversation. So the binding is live only while its turn
 * is — the footprintjs `ScopeFacade · assertLive` law, "a handle held past its
 * stage is refused", applied to the turn.
 *
 * ── Drain, then revoke — and nothing here can crash the process ──────────────
 * `drain()` waits for every operation started through the binding — a `put`
 * the hook never awaited included, and one an earlier operation's
 * continuation starts while it waits. `revoke()` then refuses every later call
 * by name (`TurnArtifactsExpiredError`). Every promise this module hands out
 * is handled the moment it is created — an operation's, and a revoked call's
 * refusal alike — so none of them can become an unhandled rejection that ends
 * the process; a host that awaits one still receives its error. (A promise the
 * HOST derives from one — `put(...).then(f)` — is the host's own.)
 *
 * ── Failures are reported, never swallowed silently ──────────────────────────
 * Every failed operation (`'operation'`, with its verb and error class) and
 * every refused late call (`'expired'`) goes to `onFailure`, which the
 * composer puts on the serving agent's stream. `reported(err)` lets the
 * composer tell a hook that merely re-threw an operation's own failure from a
 * hook that failed for a reason of its own — one failure, counted once.
 *
 * Pattern: Proxy (a lifetime-bounded view over the `ctx.artifacts` capability).
 */
import { type ArtifactEventSink } from '../artifacts/capability.js';
import type { ArtifactScope, ArtifactStore } from '../artifacts/types.js';
import { TurnArtifactsExpiredError } from './errors.js';
import type { TurnArtifacts } from './types.js';
/** The five verbs of the capability, by name — what a refusal names. */
type TurnVerb = TurnArtifactsExpiredError['op'];
/** One failure of the hand-over this module can see. */
export type TurnArtifactsFailure = {
    readonly cause: 'operation';
    readonly op: TurnVerb;
    readonly error: unknown;
} | {
    readonly cause: 'expired';
    readonly op: TurnVerb;
};
/** What one turn's hand-over is built from. */
export interface TurnArtifactsSource {
    /** The serving agent's store. Absent ⇒ `{ bound: false, reason: 'no-store' }`. */
    readonly store: ArtifactStore | undefined;
    /** This request's redemption scope. Absent ⇒ `{ bound: false, reason: 'no-session' }`. */
    readonly scope: ArtifactScope | undefined;
    /** The run this turn executed, captured when the binding is built — its `origin`. */
    readonly runId: string | undefined;
    /** Where the binding's facts go (the hosting door's adapter onto the record). */
    readonly onEvent: ArtifactEventSink;
    /** Where a failed operation or a refused late call is reported. */
    readonly onFailure: (failure: TurnArtifactsFailure) => void;
}
/** One turn's hand-over: the value the host is given, and the ways to end it. */
export interface OpenTurnArtifacts {
    readonly turn: TurnArtifacts;
    /** Wait for every operation started through the binding — including one
     *  started while this waits. Never rejects; resolves at once when nothing
     *  was bound. The composer races it against its bound. */
    drain(): Promise<void>;
    /** Refuse every later call by name. Idempotent. */
    revoke(): void;
    /** Was this error already reported as a failed operation? */
    reported(err: unknown): boolean;
}
/**
 * Open this turn's hand-over — bound to `scope`, or the stated reason there is
 * nothing to bind. `'no-session'` is checked first: with no session there is no
 * scope to name at all, whatever the store.
 *
 * @internal — the composer's; hosts receive the `TurnArtifacts` value only.
 */
export declare function openTurnArtifacts(source: TurnArtifactsSource): OpenTurnArtifacts;
export {};
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