/**
 * Structural object guard shared by all runtimes. Excludes arrays so callers can
 * treat the result as a plain `Record<string, unknown>`. Codex previously kept
 * ~4 byte-identical copies of this; the SDK runtimes all used the same shape.
 */
export declare function isPlainObject(value: unknown): value is Record<string, unknown>;
/** True when `name` is a syntactically valid MCP server key. */
export declare function isValidMcpServerName(name: string): boolean;
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