/**
 * @module purpose-classifier
 * @description SEI-01 — Classifies user input into one of 8 purpose classes
 * using keyword matching with confidence scoring.
 *
 * Purpose classes represent the high-level intent of a session entry,
 * enabling the intake gate to route to the appropriate specialist agent.
 */
/** The 8 purpose classes for session intake classification */
export type PurposeClass = "discovery" | "brainstorming" | "research" | "planning" | "implementation" | "gatekeeping" | "tdd" | "course-correction";
/** Ordered list of all valid purpose classes */
export declare const PURPOSE_CLASSES: readonly PurposeClass[];
/** Result of purpose classification */
export interface ClassificationResult {
    /** The top-scoring purpose class */
    purpose: PurposeClass;
    /** Confidence score between 0 and 1 */
    confidence: number;
    /** Alternative purpose classes sorted by descending confidence */
    alternatives: PurposeClass[];
}
/**
 * Classifies user input into a purpose class using keyword matching.
 *
 * @param input - The raw user input string to classify
 * @returns ClassificationResult with top purpose, confidence, and alternatives
 *
 * @example
 * ```typescript
 * const result = classifyPurpose("implement the caching layer")
 * // { purpose: "implementation", confidence: 0.85, alternatives: ["planning", "tdd"] }
 * ```
 */
export declare function classifyPurpose(input: string): ClassificationResult;
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