/**
 * Model configuration validation and resolution.
 *
 * Pure logic — no I/O, no side effects (except optional logger callback).
 *
 * Extracted from openclaw-plugin/src/hooks/prompt.ts (PRI-444) so that model
 * config validation can be unit-tested in core without mocking plugin I/O.
 */
/**
 * Minimal logger interface for core (structural typing — plugin's PluginLogger
 * satisfies this because `(...args: unknown[]) => void` is assignable to
 * `(msg: string) => void` under parameter bivariance).
 */
export interface CoreLogger {
    warn?(msg: string): void;
    info?(msg: string): void;
    error?(msg: string): void;
}
/**
 * Model configuration with primary model and optional fallback models.
 * Input shape for {@link resolveModelFromConfig} when config is an object.
 */
export interface ModelConfigObject {
    primary?: string;
    fallbacks?: string[];
}
/**
 * Validate model format: must be "provider/model".
 *
 * provider: e.g., "openai", "anthropic" — the API provider name
 * model: e.g., "gpt-4", "claude-3-opus" — the specific model name
 */
export declare function isValidModelFormat(model: string): boolean;
/**
 * Resolve model configuration for OpenClaw agents, supporting string and object formats.
 *
 * @param modelConfig - Model config: string (e.g. "provider/model") or { primary, fallbacks } object
 * @param logger - Optional logger for validation warnings
 * @returns Resolved model string, or null if config is missing/invalid
 */
export declare function resolveModelFromConfig(modelConfig: unknown, logger?: CoreLogger): string | null;
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