import type { SpawnAgentInput } from "../types.js";
/**
 * v2.1 Phase 4j: pre-register the child agent PARENT-SIDE and persist the
 * plaintext token via the FileTokenStore vault so the spawned terminal's
 * SessionStart hook can resolve identity from disk. Removes the operator-
 * paste step that violated `feedback_spawn_must_carry_token`.
 *
 * v2.6.1: token no longer flows through the env-var spawn-arg channel — it
 * flows through the per-instance file vault at `<instanceDir>/agents/<name>
 * .token`. The hook reads the vault first; on miss it falls back to
 * `register_agent` + capture + write. Eliminates the "spawn-agent.sh
 * directly without pre-mint" failure mode (3-min broken state) hit
 * 2026-05-04 during a builder spawn.
 *
 * Rollback: if the platform driver fails to launch, unregister the agent
 * row AND delete the vault entry so we don't leak a registered-but-not-
 * running phantom or a stale vault file blocking the next spawn.
 *
 * Name-collision: refuses cleanly if an agent with the requested name already
 * exists. Re-spawning on top would either silently rotate caps or force a
 * legacy-migration path we don't want to conflate with new-agent creation —
 * operator must unregister the existing one first.
 */
export declare function handleSpawnAgent(input: SpawnAgentInput): Promise<{
    content: {
        type: "text";
        text: string;
    }[];
    isError: boolean;
} | {
    content: {
        type: "text";
        text: string;
    }[];
    isError?: undefined;
}>;
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