/**
 * Encode a header value per the transport's value-encoding rules: plain when
 * header-safe ASCII, otherwise the base64 sentinel form. Plain values that
 * would themselves look like the sentinel are encoded to avoid ambiguity.
 */
export declare function encodeHeaderValue(value: string): string;
/** Build Mcp-Method and (when applicable) Mcp-Name for a request. */
export declare function buildStandardRequestHeaders(method: string, params: unknown): Record<string, string>;
interface HeaderAnnotation {
    readonly headerName: string;
    readonly path: readonly string[];
}
/**
 * Collect `x-mcp-header` annotations that are statically reachable from the
 * schema root through `properties` keys only. Returns null when any
 * annotation in the schema violates the constraints (which makes the whole
 * tool definition invalid per the specification).
 */
export declare function collectHeaderAnnotations(inputSchema: unknown): HeaderAnnotation[] | null;
/** True when the tool definition's x-mcp-header annotations are all valid. */
export declare function hasValidHeaderAnnotations(inputSchema: unknown): boolean;
/**
 * Build `Mcp-Param-{Name}` headers for a tools/call from the most recently
 * obtained inputSchema. Absent or null argument values omit the header.
 */
export declare function buildParamHeaders(inputSchema: unknown, args: Record<string, unknown>): Record<string, string>;
export {};
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