import type { Usage } from "../../shared/types.ts";
/**
 * Retry delays for child processes that exit before any model or tool activity.
 * The schedule is intentionally short and bounded to avoid amplifying persistent
 * launch failures while allowing concurrent Pi startup locks to clear.
 */
export declare const SUBAGENT_STARTUP_RETRY_DELAYS_MS: readonly [250, 750, 1500];
/** A genuine startup race should fail well before a model request can complete. */
export declare const MAX_SUBAGENT_STARTUP_FAILURE_DURATION_MS = 2000;
export interface SubagentStartupFailureEvidence {
    exitCode: number | null | undefined;
    error?: string;
    finalOutput?: string;
    messageCount: number;
    toolCount: number;
    usage: Usage;
    durationMs: number;
    protocolError?: unknown;
    processSignal?: string | null;
    observedMutationAttempt?: boolean;
    detached?: boolean;
    interrupted?: boolean;
    timedOut?: boolean;
    stopped?: boolean;
    turnBudgetExceeded?: boolean;
}
/**
 * Classify only unexplained, zero-activity child exits as startup failures.
 * This intentionally fails closed: any model output, tool activity, usage,
 * mutation evidence, diagnostic, or lifecycle interruption prevents a retry.
 */
export declare function isRetryableSubagentStartupFailure(evidence: SubagentStartupFailureEvidence): boolean;
export declare function formatSubagentStartupRetryNote(input: {
    model: string;
    attempt: number;
    maxAttempts: number;
    delayMs: number;
}): string;
export declare function formatSubagentStartupRetryExhaustedError(input: {
    model: string;
    attempts: number;
}): string;
/** Wait for a retry delay, returning false when any lifecycle signal aborts it. */
export declare function waitForSubagentStartupRetry(delayMs: number, signals: Array<AbortSignal | undefined>): Promise<boolean>;
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