Function recordSkillUsage

src/utils/suggestions/skillUsageTracking.ts:13–35

(skillName: string)

 * Updates both usage count and last used timestamp.
 */
export function recordSkillUsage(skillName: string): void {
  const now = Date.now()
  const lastWrite = lastWriteBySkill.get(skillName)
  // The ranking algorithm uses a 7-day half-life, so sub-minute granularity
  // is irrelevant. Bail out before saveGlobalConfig to avoid lock + file I/O.
  if (lastWrite !== undefined && now - lastWrite < SKILL_USAGE_DEBOUNCE_MS) {
    return
  }
  lastWriteBySkill.set(skillName, now)
  saveGlobalConfig(current => {
    const existing = current.skillUsage?.[skillName]
    return {
      ...current,
      skillUsage: {
        ...current.skillUsage,
        [skillName]: {
          usageCount: (existing?.usageCount ?? 0) + 1,
          lastUsedAt: now,
        },
      },
    }
  })
}

/**
 * Calculates a usage score for a skill based on frequency and recency.