What problem does it solve? Language tutors and learners accumulate session reports in markdown files but lack a systematic way to turn those raw records into targeted follow-up practice. This Skill reads recent session files, identifies recurring error patterns, and produces a data-driven plan for the next lesson. ## Core Features & Use Cases - Error Pattern Extraction: Scans session files for correction markers, categorizes errors by type (grammar, vocabulary, prepositions, etc.) and severity, then counts frequency to distinguish typos from critical weaknesses. - Trajectory Tracking: Compares accuracy, error counts, and trends across the last 3-5 sessions to measure progress and tune difficulty. - Session Planning: Generates a structured next-session plan allocating time to top weaknesses, moderate patterns, and integration scenarios. - Use Case: Before starting a Dutch writing lesson, the tutor loads this Skill to review the last three writing session reports, discovers that formal/informal pronoun confusion appeared five times, and builds a 20-minute drill sequence targeting that pattern. ## Quick Start Analyze my last three writing session files in /results and tell me what I should practice next.