/**
 * Size guard — truncates prompt injection to stay within budget.
 *
 * Architecture: this function receives the three prompt components separately
 * (matching how the plugin calls it — in-place modification of prependSystemContext,
 * prependContext, appendSystemContext). It returns an object with the stripped
 * components so the caller can reassemble.
 *
 * Priority stripping order (diagnosticianMode):
 *   1. project_context (always stripped first when over limit)
 *   1.5. intent_block (PRI-467: always stripped, sits between project_context and thinking_os)
 *   2. thinking_os (only in diag mode)
 *   3. evolution_principles (only in diag mode)
 *   4. reflection_log (only in diag mode)
 *   5. reason: line truncation (only in diag mode, when reason: line > 129 chars)
 *   6. fallback: only replaces appendSystemContext — prependSystemContext and
 *      prependContext are ALWAYS preserved (matching plugin behavior)
 *
 * Phase: PRI-75 Prompt Injection SDK Migration Phase 1
 */
import type { SizeGuardOptions, TruncateResult } from './types.js';
/**
 * Truncates the combined prompt injection to fit within budget.
 *
 * Receives the three prompt components separately (prependSystemContext,
 * prependContext, appendSystemContext) to allow exact-content replacement and
 * proper fallback behavior (preserving prependSystemContext + prependContext).
 *
 * @param prependSystemContext - Fixed system identity block
 * @param prependContext - Dynamic directives block
 * @param appendSystemContext - Principles + Thinking OS + reflection_log + project_context
 * @param options - Size guard options (diagnosticianMode, blocks with exact content for replacement)
 * @returns Stripped prompt components + truncation log
 */
export declare function truncateInjectionToBudget(prependSystemContext: string, prependContext: string, appendSystemContext: string, options?: SizeGuardOptions): TruncateResult;
//# sourceMappingURL=size-guard.d.ts.map