/**
 * Playbook search — symptom-to-playbook matching (Sprint 25).
 *
 * Loads playbooks from .bober/playbooks/*.md (skipping README.md).
 * Each playbook frontmatter (name, classification, applicableSymptoms,
 * prerequisites) is parsed via a minimal YAML block parser — no external dep.
 *
 * searchPlaybooks(symptom) tokenises the symptom string, scores each
 * playbook's applicableSymptoms by token overlap, and returns matches
 * sorted by confidence descending.
 *
 * Confidence thresholds (exported constants):
 *   HIGH_CONFIDENCE_THRESHOLD  = 0.6  → diagnoser auto-follows playbook
 *   LOW_CONFIDENCE_THRESHOLD   = 0.3  → diagnoser surfaces as suggestion
 *
 * Sprint 25 — src/incident/playbook-search.ts
 */
/** A match at or above this threshold triggers automatic playbook execution. */
export declare const HIGH_CONFIDENCE_THRESHOLD = 0.6;
/** A match at or above this (and below HIGH) surfaces as a suggestion. */
export declare const LOW_CONFIDENCE_THRESHOLD = 0.3;
export interface Playbook {
    name: string;
    classification: "standard" | "emergency";
    applicableSymptoms: string[];
    prerequisites: string[];
    filePath: string;
    /** Raw step sections (## Step N: ...) extracted from the markdown body */
    stepSections: string[];
}
export interface PlaybookMatch {
    playbook: Playbook;
    /** Confidence in [0, 1]. Clamped to the range. */
    confidence: number;
    /** The tokens from the query that overlapped with a matched symptom phrase */
    matchedTokens: string[];
}
/**
 * Tokenise a string into lowercase, non-empty, non-stopword tokens.
 * Splits on whitespace and common punctuation.
 */
export declare function tokenize(text: string): string[];
/**
 * Load all playbooks from .bober/playbooks/*.md in the given projectRoot.
 * - Skips README.md
 * - Skips files with missing or malformed frontmatter (logs a warning)
 * - Returns [] gracefully when the directory does not exist
 */
export declare function loadPlaybooks(projectRoot: string): Promise<Playbook[]>;
/**
 * Search the playbook library for playbooks matching the given symptom string.
 *
 * Algorithm:
 *   1. Tokenise the symptom string.
 *   2. For each playbook, score each of its applicableSymptoms phrases.
 *   3. Take the maximum score across phrases as the playbook's confidence.
 *   4. Return all playbooks with confidence > 0, sorted descending by confidence.
 *
 * @param symptom     The free-text symptom string from the incident.
 * @param projectRoot Absolute path to the project root. Defaults to process.cwd().
 */
export declare function searchPlaybooks(symptom: string, projectRoot?: string): Promise<PlaybookMatch[]>;
/**
 * Search a pre-loaded list of playbooks. Useful for testing without touching disk.
 */
export declare function searchPlaybooksList(symptom: string, playbooks: Playbook[]): PlaybookMatch[];
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