/**
 * @fileoverview Shared context-word extraction for skill recommendations.
 * @module @skillsmith/core/services/context-words
 * @see SMI-5986: CLI `recommend --context` (`recommend.ts:76`) and MCP
 *   `skill_recommend`'s `project_context` (`recommend.ts:127`) each derived a
 *   "context words" slice for the recommendation stack via
 *   `.filter((w) => w.length > 3)` — a bare length threshold that silently
 *   dropped real 2-3 character technical terms ("git", "ci", "aws", "sql")
 *   that happen to be short. When a caller's context consisted only of such
 *   terms, the resulting derived stack was empty and the SMI-5896
 *   empty-stack guard (`buildEmptyStackGuidance`, this module's sibling)
 *   fired even though the caller *did* supply usable context.
 *
 *   Shared here (not duplicated per-twin) so CLI and MCP can't independently
 *   drift on what counts as noise vs. a real short technical term — the same
 *   class of duplication risk `buildEmptyStackGuidance` above already closed
 *   for the empty-stack message itself (plan-review correction, SMI-5984
 *   Wave 1: a bare length threshold "admits noise words" and leaves the two
 *   twins free to drift apart again independently).
 */
/**
 * Extract up to `maxWords` usable technical terms from free-text project
 * context for the recommendation stack.
 *
 * Replaces the old `.filter((w) => w.length > 3)` threshold: real technical
 * terms of 2-3 characters ("git", "ci", "aws", "sql") are now kept, while
 * single-character tokens, punctuation-only tokens (including one that
 * survives edge-stripping because it's made entirely of `+`/`#`, e.g. "++"
 * or "+#" — PR review round 3, SMI-5986), and short English function words
 * ("a", "the", "is", ...) are still dropped as noise. Words of 4+
 * characters are unaffected — this only changes the outcome for the short
 * end of the spectrum the length threshold got wrong.
 *
 * @param projectContext - Free-text project/context description. `null`/
 *   `undefined`/empty returns `[]`, mirroring both callers' pre-existing
 *   `if (project_context)` guard.
 * @param maxWords - Maximum number of words to return (default 5).
 */
export declare function extractContextWords(projectContext: string | undefined | null, maxWords?: number): string[];
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