/**
 * PRI-467 — Pure builder for the Intent Friction Prompt Block.
 *
 * Produces a bounded, escaped `<intent_anchor>` + `<intent_doc>` +
 * `<intent_friction>` block per SPEC §13.2 and §13.3.
 *
 * Trust boundary (SPEC §12.2):
 * - INTENT.md is treated as quoted reference data, never as executable
 *   system/tool instructions.
 * - Raw content is XML-escaped before embedding so it cannot break the
 *   surrounding prompt block structure or inject live XML tags.
 * - Content is bounded to INTENT_INJECT_MAX_CHARS to avoid prompt budget
 *   explosion; oversized content is truncated with a visible marker.
 *
 * Pure logic — no I/O, no side effects, never throws. Callers that have
 * no intent doc (flag off, missing file, read error) should pass `undefined`
 * and receive an empty string.
 *
 * ERR checklist:
 * EP-01 / ERR-001, ERR-005, ERR-009: input validated with typeof, never `as`
 * EP-03 / ERR-002: missing/invalid input returns empty string, never throws
 * EP-09: pure function — independently unit-testable without mocks
 */
/**
 * Maximum number of characters of raw INTENT.md content injected into the
 * prompt. Oversized content is truncated with a visible marker so the Agent
 * still knows the doc was bounded.
 *
 * SPEC §12.2 requires bounded injection. 4000 chars is well within the
 * prompt hook size guard budget (9000 chars total) and leaves room for
 * other appendSystemContext blocks.
 */
export declare const INTENT_INJECT_MAX_CHARS = 4000;
/**
 * Input to buildIntentFrictionBlock. `rawIntentMd` is the raw, unescaped
 * INTENT.md file content. The builder escapes and bounds it.
 */
export interface IntentFrictionBlockInput {
    rawIntentMd: string;
}
/**
 * Truncation marker appended when raw intent content exceeds the budget.
 * Kept as a constant so tests can match it exactly.
 */
export declare const INTENT_TRUNCATION_MARKER = "\n...[truncated: intent doc exceeds injection budget]";
/**
 * Build the Intent Friction Prompt Block (SPEC §13.2 + §13.3).
 *
 * Returns an empty string when:
 * - input is undefined (flag-off / no-doc path)
 * - rawIntentMd is not a string
 * - rawIntentMd is empty or whitespace-only
 *
 * Otherwise returns a string containing three XML blocks:
 * 1. `<intent_anchor>` — declares INTENT as Owner-owned quoted reference
 * 2. `<intent_doc>` — bounded + XML-escaped raw intent content
 * 3. `<intent_friction>` — instructions for the optional intent_check format
 *
 * The function never throws. Callers can safely pipe the result into
 * appendSystemContext assembly.
 */
export declare function buildIntentFrictionBlock(input: IntentFrictionBlockInput | undefined): string;
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