/**
 * Checks a tool call's arguments against the schema that tool publishes.
 *
 * Both checks read the SAME tool definitions the server hands to callers, so
 * neither can drift from what a caller sees in `tools/list`. They live here
 * rather than in server/index.ts because that module starts a server the
 * moment it is imported, which makes its internals untestable.
 */
/** The shape this module needs from a tool definition; anything else is ignored. */
export interface ToolDefinitionLike {
    name: string;
    inputSchema?: {
        required?: string[];
        properties?: Record<string, unknown>;
    };
}
export interface ToolArgumentChecker {
    /** Throws when a field the tool advertises as required is absent. */
    assertRequiredFields(name: string, args: unknown): void;
    /** Throws when a field the tool does not advertise is present. */
    assertKnownFields(name: string, args: unknown): void;
}
/**
 * The advertised field closest to `candidate`, or null when nothing is close.
 *
 * A containing name wins outright -- `filePattern` against `pattern` is a
 * likelier slip than anything edit distance would rank first.
 */
export declare function nearestKnownField(candidate: string, known: ReadonlySet<string>): string | null;
/**
 * Builds the two checks from the definitions the server publishes.
 */
export declare function createToolArgumentChecker(tools: readonly ToolDefinitionLike[]): ToolArgumentChecker;
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