import type { LlmTool } from '@mcp-abap-adt/llm-agent';
export interface ToolBlockEntry {
    toolName: string;
    blockedUntil: number;
    reason: string;
}
export declare class ToolAvailabilityRegistry {
    private readonly defaultTtlMs;
    private readonly sessions;
    constructor(defaultTtlMs?: number);
    getBlockedToolNames(sessionId: string, now?: number): Set<string>;
    isBlocked(sessionId: string, toolName: string, now?: number): boolean;
    block(sessionId: string, toolName: string, reason: string, ttlMs?: number, now?: number): ToolBlockEntry;
    filterTools(sessionId: string, tools: LlmTool[], now?: number): {
        allowed: LlmTool[];
        blocked: string[];
    };
    private prune;
}
export declare function isToolContextUnavailableError(message: string): boolean;
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