Kilacraft-AI v2.1.2 Knowledge Base Retrieval Reconstruction and Optimization; In-Game Query and Diagnostic Commands

v2.1.2 - New In-Game Query & Diagnostic Commands (usage / history / memory / skills / run / doctor / about), Knowledge-Base Retrieval Refactor & AI Error Handling

✨ New Features

• Corpus Seeding Dictionary: On startup, automatically scans the knowledge base for command names (e.g. /back → back) and compound identifiers (e.g. mob-farm, ender-dragon) and adds them to the HanLP tokenizer dictionary. No manual dictionary maintenance — the knowledge base content server owners write is itself the best tokenization reference
• Knowledge Base Writing Guide: The official Wiki provides ready-to-use knowledge-base writing templates (Chinese & English) — 7 writing rules + a complete usable sample; filling in per the template yields the best recall
• BM25 Document Length Auto-Statistics: On startup, automatically computes the actual average length of knowledge-base chunks so BM25 scores long and short docs more fairly. Advanced users may set a fixed avg_doc_length (default 0 = auto)
• In-Game Query & Diagnostic Commands: A set of commands for server owners and players to track AI usage and troubleshoot
  • /kila usage [player|all] [range]: AI usage stats (conversation turns, skill-call count & success rate, top skills, active players); supports self / specific player / server-wide views
  • /kila history [player] [page]: paginated conversation history
  • /kila memory [player]: view a player's profile (login stats + AI-analyzed 8-dimension profile)
  • /kila skills [page]: list currently available skills
• Force-Execute a Skill: /kila run <skill> <prompt> skips intent recognition and directly executes the named skill; supports multi-step tasks and gracefully falls back to normal chat if the intent can't be parsed
• Configuration Self-Diagnostic: /kila doctor runs 17 config checks (database / LLM connectivity / Spark / AI capability switches, etc.) to quickly locate misconfiguration; prints a redacted full-config dump to the console
• Version & Update Check: /kila about shows current version, latest version, and download URL

🔧 Improvements

• Retrieval Filter Refactor (hard threshold → soft/adaptive threshold): The old min_relevance_score (single hard threshold 30) is replaced by two-stage filtering
  • Noise floor: hard cutoff — anything below is dropped (default 25)
  • Relative threshold: soft cutoff — dropped if below top score × ratio (default 0.3)
  • Final threshold = max(noise floor, top score × relative threshold); mathematically guarantees at least 1 relevant result is returned — no more "relevant content exists but nothing comes back"
  • Tunable: lower both → more results (weakly related questions also answered); raise both → stricter (stay silent when unsure)
• BM25 Parameter Tuning: chunk overlap 30 → 50 chars (longer-doc context more coherent after segmentation); min chunk 25 → 20 chars (fewer short-but-useful paragraphs wrongly dropped); short-doc protection — chunks under 50 chars are exempt from the length penalty (old command-style docs were severely under-scored for being too short)
• Embedding Switches to Fusion Mode: No longer replaces BM25 with Embedding alone; instead BM25 + Embedding run in parallel and fuse via RRF (Reciprocal Rank Fusion) by rank. Chunks appearing in both paths rank higher, single-path chunks still participate — balancing exact keyword match and semantic understanding
• Custom Dictionary Auto-Syncs with Corpus: Hot-reloading the knowledge base re-scans the corpus and rebuilds the tokenizer dictionary; new command names / identifiers take effect immediately
• Project Stability: Fixed several NPE crashes from extreme inputs; hardened defenses against unknown user-authored docs
• AI Error Categorized Hints (highlight of this release): When an AI call fails, players now see an actionable, cause-locating hint (e.g. "The model name may be incorrect. Please check the 'model' setting in llm.yml", "API Key is invalid or lacks permission"); the raw error detail is also logged to console WARN for quick troubleshooting. Covers all AI call scenarios: normal chat, skills, tasks, login greeting, AFK notifications, server broadcast
• AI Timeout Friendly Hint: On response timeout, shows "AI response timed out. Please try again later" instead of exposing technical exception class names to the player
• AFK Task Callback Degradation Hint: When an AFK task's callback config fails to parse, clearly states the task will run in "notify-only" mode (callback action cannot execute), with the raw content logged for troubleshooting
• Code Standard Cleanup: Unified utility-class constructor style, removed fully-qualified class names, consolidated redundant method overloads (internal cleanup, no functional impact)
• Complete English Support: All command output and prompts now fully support Chinese/English bilingual; the English-environment experience is complete
• Permission-Aware Help Menu: /kila help shows only the commands the current player has permission to use
• Granular Query Permissions: Viewing self / others / server-wide are authorized separately (kilacraft.query.self, kilacraft.usage.other, etc.)

🐛 Bug Fixes

• Fixed NPE from missing null defenses in BM25Scorer.countOccurrences / EmbeddingCache.getVector / putVector / getNorm
• Fixed players getting stuck on "Thinking..." with no error message when an AI call failed due to config errors (wrong model name / Key / URL, rate limiting, server-side failure, etc.)
• Fixed AI error hints being mistakenly written into conversation history and polluting subsequent chat context (normal chat, login greeting, plugin-command paths)
• Fixed profile analysis writing dirty data and bumping the version number when the AI returned an abnormal structure (added an 8-field whitelist + length cap)
• Fixed occasional no-response hang when the AI secondary analysis failed during skill / task execution

⚠️ Compatibility

Upgrading from v2.1.1

1. Stop server, replace JAR, start
2. Recommended (for the full retrieval optimization): delete knowledge.yml and restart to let the plugin regenerate the latest version with the new config entries, then tweak as needed
3. Works without deleting knowledge.yml: the old min_relevance_score is ignored (no longer used), and retrieval filtering auto-applies the default soft thresholds (noise_floor=25, relative_threshold=0.3)
4. If you previously hand-maintained command names / identifiers in custom_dictionary.words, consider trimming them after upgrade — the new corpus-seeding dictionary auto-extracts these from knowledge-base content
5. Recommended to delete the language config files (language.yml / language_en.yml): the help-menu format was restructured and many command messages were added this build; keeping the old file leaves new command prompts missing and the help menu outdated. Delete and restart to regenerate the latest version, then re-apply your custom text
6. Server owners using English (en) mode should delete i18n/messages_en.yml: player-facing command text was migrated to the language.yml system this build, and the corresponding old keys were removed from messages_en.yml; deleting and restarting avoids leftover redundancy