All notable changes to [MemPalace](https://github.com/MemPalace/mempalace) are documented in this file.
The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/), and this project adheres to [Semantic Versioning](https://semver.org/).
- **Install regression** — `mempalace-mcp` console script is now declared in `pyproject.toml` alongside `.claude-plugin/plugin.json`'s reference to it. In v3.3.2 the two drifted apart (plugin.json shipped the new `"command": "mempalace-mcp"` form before the matching entry point landed), so every fresh `pip install mempalace==3.3.2` produced a Claude Code plugin config pointing at a binary that wasn't installed. (#1093, #340)
- Restore silent-save visibility after the Claude Code 2.1.114 client regression — production transcript saves were failing silently until this PR. (#1021)
- Paginate `status`-path metadata fetches so large palaces don't trip SQLite variable limits. (#851)
- Resolve the Claude plugin hook runner across platform / plugin-dir variations; previously broke on Windows and some macOS layouts. (#942)
- Real `python3` resolution for `.sh` hooks with a `MEMPAL_PYTHON` override path. (#833)
- Add optional `wing` parameter to `tool_diary_write` / `tool_diary_read` and derive per-project wing from the Claude Code transcript path when writing from the stop hook — diary entries from different projects no longer collapse into a shared default wing. (#659)
- Treat empty string as "no filter" in `mempalace_search``wing`/`room`; LLM agents that default to filling every optional parameter with `""` no longer get bounced with `must be a non-empty string`. (#1097, #1084)
- Broaden `_wing_from_transcript_path` to handle Claude Code project folders without a `-Projects-` segment (e.g. `~/dev/<parent>/<project>`, `~/code/<project>`). The project name is now derived from the final dash-separated token of the encoded folder, so Linux users with code outside `~/Projects/` get per-project diary scoping instead of falling through to `wing_sessions`. (#1145, follow-up to #659)
-`mempalace_diary_read(wing="")` now returns diary entries from every wing this agent has written to, matching the #1097 "empty-string as no filter" pattern. Previously defaulted to `wing_<agent>`, siloing entries that hooks wrote to project-derived wings. (#1145)
- **Deterministic hook saves.** Save hook now uses a silent Python API path, so successive hook invocations produce reproducible results and zero data loss on the hot path. (#673)
- **Graph cache with write-invalidation** inside `build_graph()` — warm-path calls no longer rebuild the palace-graph per request. (#661)
### Added
- i18n: Belarusian translation. (#1051)
- i18n: entity detection for German, Spanish, and French locales. (#1001)
- i18n: Traditional + Simplified Chinese entity detection. (#945)
### Known — deferred to v3.3.4
- HNSW parallel-insert SIGSEGV when `hnsw:num_threads` is unset on collection creation (#974) — fix in-flight as #976, awaiting rebase against develop.
- Fix silent drop of `.jsonl` files in project miner; raise `MAX_FILE_SIZE` cap from 10 MB to 500 MB so large transcripts no longer fall through unnoticed. Adds a tandem **sweeper** — a message-level, timestamp-coordinated, idempotent safety net that catches anything the primary miner missed. (#998)
-`mempalace sweep <target>` CLI to run the sweeper on demand against a transcript file or a directory. (#998)
- Guard `Layer3.search_raw` against `None` doc/meta rows returned by ChromaDB — prevents `AttributeError` crashes on mixed-schema palaces. (#1011, #1013)
- Guard searcher API path, closet loop, and miner status histogram against `None` metadata; matching guards added to `tool_status` / `list_wings` / `list_rooms` / `get_taxonomy` in the MCP server. (#999)
- Upgrade `chromadb` floor to `>=1.5.4` for Python 3.13 / 3.14 compatibility and pin upper bound to `<2` so future breaking majors don't silently install. (#1010)
- Fix Unicode checkmark rendering on Windows terminals that can't encode the `✓` glyph — avoids `UnicodeEncodeError` crashes on first-run output. (#681)
- **`quarantine_stale_hnsw`** — on open, detect HNSW segment directories whose `data_level0.bin` is significantly older than `chroma.sqlite3` and rename them out of the way. Recovers cleanly from HNSW/sqlite drift that otherwise causes SIGSEGV on `count()` / `query(...)` (the chroma-core/chroma#2594 failure mode). Rebuilds the index lazily on next use. (#1000)
- **PID file guard** — `mine` writes a per-source-directory PID file and refuses to start if an existing mine is still running, preventing process stacking that bloats HNSW and wedges concurrent writes. Includes cross-platform PID liveness check (`os.kill(pid, 0)` terminates on Windows, so the guard falls back to a platform-aware probe). (#1023)
### Improvements
- **RFC 001 §10 — typed backend contracts.** `BaseBackend` now returns typed `QueryResult` / `GetResult` dataclasses and `PalaceRef` for palace identity; registry-based backend discovery. Internal refactor; no user-facing API change. (#995)
- **RFC 002 §9 — source adapter scaffolding.** Introduces `BaseSourceAdapter`, adapter registry, and `PalaceContext` — the plumbing that future pluggable ingest sources will target. Internal refactor; no user-facing API change yet. (#1014)
### Documentation
- **RFC 002** — full specification for the source adapter plugin system (future pluggable ingest). (#990)
- First-run help text and `README` now reference the real `~/.claude/projects/<project>/` path shape instead of the placeholder `/path/to/transcripts`. (#996, #1012)
### Internal
- Harden sweeper for production: verbatim tool blocks, full `session_id`, logged failures.
- Address Copilot review on #995: cursor tie-break, honest metrics, accurate comments.
- Test hygiene: avoid ONNX network download in update-length validation tests; dedup update-length-validation tests; fix Windows file-lock in cache-invalidation test.
---
## [3.3.1] — 2026-04-16
### New Features
**Multi-language entity detection** — lexical patterns (person verbs, pronouns, dialogue markers, project verbs, stopwords, candidate character classes) now live in the optional `entity` section of each locale JSON under `mempalace/i18n/<lang>.json`. Every public function in `entity_detector` accepts a `languages=` tuple and unions patterns across enabled locales. Default stays `("en",)` so existing English-only callers are unchanged. (#911)
- **Five new fully-supported locales** with CLI strings, AAAK compression instructions, and entity-detection patterns:
- Brazilian Portuguese `pt-br` (#156)
- Russian `ru` (#760)
- Italian `it` (#907)
- Hindi `hi` (#773)
- Indonesian `id` (#778)
- **`MempalaceConfig.entity_languages`** — persistent palace-level language selection; `MEMPALACE_ENTITY_LANGUAGES` env override; `mempalace init --lang en,pt-br` flag that saves to `~/.mempalace/config.json` (#911)
- **Per-language `candidate_pattern`** — non-Latin scripts register their own character class, so names like `João`, `Инна`, `राज` are no longer silently dropped by the ASCII-only default (#911)
- **VSCode devcontainer** matching the CI environment (#881)
-`MEMPAL_VERBOSE` env toggle — developers see diaries surfaced in chat while the default remains silent (#871)
-`created_at` timestamps included in search results (#846)
### Bug Fixes
**i18n / Unicode**
- Script-aware word boundaries for combining-mark scripts — Python's `\b` fails on Devanagari vowel signs (`ा ी ु`), Arabic, Hebrew, Thai, Tamil, Khmer etc., truncating names like `अनीता` → `अनीत` and making person-verb patterns never fire. Locales now declare an optional `boundary_chars` field and the i18n loader expands `\b` into a script-aware lookaround boundary (#932)
- Case-insensitive BCP 47 language code resolution — `--lang PT-BR`, `zh-cn`, `Pt-Br` previously fell through to English silently; now resolve to the canonical locale file via lowercase matching, with the entity-pattern cache keyed on the canonical form so casing variations share one cache entry (#928)
- Wire i18n candidate patterns into `miner._extract_entities_for_metadata()`, `palace.build_closet_lines()`, and `entity_registry.extract_unknown_candidates()` — three code paths that still hardcoded ASCII-only `[A-Z][a-z]{2,}` and silently missed Cyrillic, accented Latin, and non-Latin entity metadata tags (#931)
- Explicit `encoding="utf-8"` on `Path.read_text()` calls across entity_registry, instructions_cli, split_mega_files, and onboarding tests — prevents Windows GBK (and other non-UTF-8) locales from corrupting UTF-8 files (#946, #776)
-`ko.json``status_drawers` used `{drawers}` instead of `{count}`, showing the raw template string instead of the number (#758)
- Move `test_i18n.py` from inside the installed package into `tests/` so pytest actually collects it; remove the `sys.path.insert` hack (#758)
-`Dialect.from_config()` defaulted to `current_lang()` (module-global) when config had no `lang` key — replaced with explicit `"en"` fallback for determinism (#758)
**Other**
- Guard `KnowledgeGraph.close()` and `query_relationship`/`timeline`/`stats` methods with the instance lock to prevent concurrent-access corruption (#887, #884)
- Replace invalid `{"decision": "allow"}` with `{}` in hook responses — the string wasn't a valid decision value and triggered schema warnings (#885)
-`entity_registry.research()` defaults to local-only — previously made outbound Wikipedia HTTPS requests without explicit user opt-in; callers now must pass `allow_network=True` (#811)
- Precompact hook no longer blocks compaction when it fails or takes too long (#856, #858, #863)
- Redirect stdout to stderr during MCP server import so library logging can't corrupt the JSON-RPC channel (#225, #864)
-`mempalace init` auto-adds per-project files to `.gitignore` in git repositories so users don't accidentally commit `mempalace.yaml` / `entities.json` (#185, #866)
- Searcher guards against empty ChromaDB query results that previously raised on edge-case corpora (#195, #865)
- Return empty status instead of an error on a cold-start palace with no drawers yet (#830, #831)
- Restrict file permissions on sensitive palace data (#814)
- Slack transcript importer writes a provenance header and preserves speaker IDs (#815)
- Allow `mempalace mine` to run in directories without a local `mempalace.yaml` and surface the missing-yaml warning on stderr (#604)
- Security hook injection fix (#812)
- Save hook auto-mines transcripts even when `MEMPAL_DIR` is unset (#840)
- Pin the Pages custom domain via a shipped `CNAME` in the deploy artifact (#877)
- Version drift safeguard — sync pyproject + `version.py` + README badge in one place (#876)
- Deploy docs workflow now runs on `develop` only, preventing accidental main-branch deploys (#845)
### Improvements
- Regex compilation optimization for entity extraction — pre-compile per-entity pattern sets once and cache by `(name, languages)` tuple, so multi-language callers don't thrash the cache (#880)
- Knowledge-graph value sanitization now preserves natural punctuation (commas, colons, parentheses) that commonly appears in KG subject/object values (#873)
### Documentation
- Clarify that `mempalace init` requires a `<dir>` argument in CLI help text (#210, #862)
- Domain name and specific impostor sites called out in the scam-alert section (#869)
- Tightened `SECURITY.md` with a real version-support policy and the GHPVR-only reporting channel (#810)
- Fixed stale `pyproject.toml` URLs (#853)
- v4 planning prep (#852)
### Internal
-`palace_graph` tunnel helper test coverage (#908)
- Rewrite `README.md` and `mempalaceofficial.com` benchmark pages to remove category-error cross-system comparisons (R@5 retrieval recall had been listed next to competitor QA accuracy under one column), remove the retracted "+34% palace boost" claim from the surfaces where it had remained, replace the `100%` Haiku-rerank headline with the honest held-out `98.4%` R@5, drop the LoCoMo `100%` top-50 row (retrieval-bypass artefact), and fix the broken `aya-thekeeper/mempal` reproduction URL (#875)
- Add `docs/HISTORY.md` as the canonical home for corrections, retractions, and public notices; move the 2026-04-07 "Note from Milla & Ben" and the 2026-04-11 impostor-domain notice out of `README.md`
- Add v3.3.0 reproduction result JSONLs and the deterministic `seed=42` 50/450 LongMemEval split under `benchmarks/` — every BENCHMARKS.md claim reproduces exactly
