/**
 * Runtime attestation (ADR 0005 H9). Declares the implementation status
 * of each runtime export in this module. See CONTRIBUTING.md § Module
 * attestations for the category definitions and the convention for
 * updating these when sync or rebrand changes the surface.
 */
export declare const MODULE_ATTESTATIONS: {
    readonly decodeStrictBase64: "live";
    readonly splitModelRef: "live";
    readonly spawnSubagentDirect: "live";
};
export declare const SUBAGENT_SPAWN_MODES: readonly ["run", "session"];
export type SpawnSubagentMode = (typeof SUBAGENT_SPAWN_MODES)[number];
export declare const SUBAGENT_SPAWN_SANDBOX_MODES: readonly ["inherit", "require"];
export type SpawnSubagentSandboxMode = (typeof SUBAGENT_SPAWN_SANDBOX_MODES)[number];
export declare function decodeStrictBase64(value: string, maxDecodedBytes: number): Buffer | null;
export type SpawnSubagentParams = {
    task: string;
    label?: string;
    agentId?: string;
    model?: string;
    runTimeoutSeconds?: number;
    thread?: boolean;
    mode?: SpawnSubagentMode;
    cleanup?: "delete" | "keep";
    sandbox?: SpawnSubagentSandboxMode;
    expectsCompletionMessage?: boolean;
    attachments?: Array<{
        name: string;
        content: string;
        encoding?: "utf8" | "base64";
        mimeType?: string;
    }>;
    attachMountPath?: string;
};
export type SpawnSubagentContext = {
    agentSessionKey?: string;
    agentChannel?: string;
    agentAccountId?: string;
    agentTo?: string;
    agentThreadId?: string | number;
    agentGroupId?: string | null;
    agentGroupChannel?: string | null;
    agentGroupSpace?: string | null;
    requesterAgentIdOverride?: string;
};
export declare const SUBAGENT_SPAWN_ACCEPTED_NOTE = "auto-announces on completion, do not poll/sleep. The response will be sent back as an user message.";
export declare const SUBAGENT_SPAWN_SESSION_ACCEPTED_NOTE = "thread-bound session stays active after this task; continue in-thread for follow-ups.";
export type SpawnSubagentResult = {
    status: "accepted" | "forbidden" | "error";
    childSessionKey?: string;
    runId?: string;
    mode?: SpawnSubagentMode;
    note?: string;
    modelApplied?: boolean;
    error?: string;
    attachments?: {
        count: number;
        totalBytes: number;
        files: Array<{
            name: string;
            bytes: number;
            sha256: string;
        }>;
        relDir: string;
    };
};
export declare function splitModelRef(ref?: string): {
    provider: undefined;
    model: undefined;
} | {
    provider: string;
    model: string;
} | {
    provider: undefined;
    model: string;
};
export declare function spawnSubagentDirect(params: SpawnSubagentParams, ctx: SpawnSubagentContext): Promise<SpawnSubagentResult>;