export type SearchableTool = {
    /** Prefixed name as the combiner serves it, e.g. "github_search_code". */
    name: string;
    description?: string;
};
export type RankedMatch = {
    tool: SearchableTool;
    score: number;
};
/** Rank tools against a query. Coverage floor: ≥60% of query tokens must match
 *  somewhere (100% for ≤2-token queries) — the adapter's anti-noise rule. */
export declare function rankTools(tools: SearchableTool[], query: string, limit: number, offset?: number): RankedMatch[];
/** Simple substring fallback for regex-mode search (pattern pre-validated by caller). */
export declare function regexMatches(tools: SearchableTool[], pattern: RegExp, limit: number, offset?: number): RankedMatch[];
/** Compile a user regex with a conservative safety net: anchored parsing + a size
 *  ceiling. Returns undefined (with reason) for anything that smells exponential. */
export declare function compileSafeRegex(pattern: string): {
    re?: RegExp;
    error?: string;
};
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