mempalace

<div align="center"> <img src="assets/mempalace_logo.png" alt="MemPalace" width="240"> # MemPalace Local-first AI memory. Verbatim storage, pluggable backend, 96.6% R@5 raw on LongMemEval — zero API calls. [![][version-shield]][release-link] [![][python-shield]][python-link] [![][license-shield]][license-link] [![][discord-shield]][discord-link] </div> > [!CAUTION] > **Beware of impostor sites.** MemPalace has no other official websites. The **only** official sources are this **[GitHub repository](https://github.com/MemPalace/mempalace)**, the **[PyPI package](https://pypi.org/project/mempalace/)**, and the docs at **[mempalaceofficial.com](https://mempalaceofficial.com)**. Any other domain (including `.tech`, `.net`, or other `.com` variants) is an impostor and may distribute malware. Details and timeline: [docs/HISTORY.md](docs/HISTORY.md). > [!IMPORTANT] > **Claude Code sessions expire in 30 days without auto-save hooks wired.** [Read this →](https://github.com/MemPalace/mempalace/discussions/1388) > > Need the shortest recovery/setup path? Use the [Claude Code retention setup checklist](https://mempalaceofficial.com/guide/claude-code-retention.html). --- ## What it is MemPalace stores your conversation history as verbatim text and retrieves it with semantic search. It does not summarize, extract, or paraphrase. The index is structured — people and projects become *wings*, topics become *rooms*, and original content lives in *drawers* — so searches can be scoped rather than run against a flat corpus. The retrieval layer is pluggable. The current default is ChromaDB; the interface is defined in [`mempalace/backends/base.py`](mempalace/backends/base.py) and alternative backends can be dropped in without touching the rest of the system. Nothing leaves your machine unless you opt in. Architecture, concepts, and mining flows: [mempalaceofficial.com/concepts/the-palace](https://mempalaceofficial.com/concepts/the-palace.html). --- ## Install MemPalace ships a CLI, so install it in an isolated environment to avoid PEP 668 errors on Debian/Ubuntu/Homebrew Pythons and to keep mempalace's deps (`chromadb`, `numpy`, `grpcio`, …) from conflicting with anything else in your global site-packages. We recommend [`uv`](https://docs.astral.sh/uv/) — `uv tool install` puts the `mempalace` CLI in an isolated environment on your PATH: ```bash uv tool install mempalace mempalace init ~/projects/myapp ``` [`pipx`](https://pipx.pypa.io/) works the same way if you prefer it: `pipx install mempalace`. Prefer plain `pip` only inside an activated virtualenv where you explicitly want `import mempalace` available: ```bash python -m venv .venv && source .venv/bin/activate pip install mempalace ``` ### Android / Termux Native Termux installation is not currently supported because compiled dependencies such as ChromaDB and ONNX Runtime publish Linux wheels, not Android wheels. Android ARM64 users can run the regular Linux packages in an isolated Debian PRoot container instead. See the [Termux installation guide](website/guide/termux.md) for the tested setup and an argv-preserving launcher. ### Docker A container image is also available for running the MCP server or the CLI without a local Python toolchain. Multi-arch (amd64 + arm64), so it runs natively on Apple Silicon: ```bash docker pull ghcr.io/mempalace/mempalace:latest ``` Everything persists under `/data` — palace, config, and the cached embedding model — so mount a volume there and reuse it across runs: ```bash # MCP server over stdio — note the `-i` flag (JSON-RPC needs stdin) docker run -i --rm -v mempalace-data:/data ghcr.io/mempalace/mempalace # Run any CLI command instead. The container only sees what you mount, so # mount the directory you want to mine — read-only is enough, mining never # writes to the source. docker run --rm -v mempalace-data:/data -v /path/to/project:/work:ro \ ghcr.io/mempalace/mempalace mine /work docker run --rm -v mempalace-data:/data ghcr.io/mempalace/mempalace search "why GraphQL" ``` The first command that needs embeddings downloads the model into `/data` (~80 MB for the default `minilm`, ~300 MB for `embeddinggemma`). It is a one-off as long as the volume persists, but it does mean the first call is slow and needs network — worth knowing before assuming a hung container. Wire it into an MCP client (e.g. Claude Code) as a stdio server. Mount anything you want the server to be able to mine — it cannot reach your transcripts otherwise: ```json { "mcpServers": { "mempalace": { "command": "docker", "args": [ "run", "-i", "--rm", "-v", "mempalace-data:/data", "-v", "/absolute/path/to/.claude/projects:/transcripts:ro", "ghcr.io/mempalace/mempalace" ] } } } ``` Use a real absolute path there — `~` and `$HOME` are not expanded by every MCP client. Paths are container paths from then on: mine `/transcripts`, not `~/.claude/projects`. **Mount permissions on Linux.** The image runs as uid 1000 and bind mounts keep their host ownership, so a mounted directory has to be readable by that uid — an ordinary `0755` checkout is fine, a `0700` directory is not, and the failure surfaces as `PermissionError: [Errno 13]` rather than anything about Docker. Docker Desktop maps uids on macOS and Windows, so this only bites on Linux. Do **not** work around it with `--user`: `/data` is owned by uid 1000 inside the image, so another uid cannot write the palace at all. `docker compose run --rm mcp` works too (see `docker-compose.yml`), and `deploy/docker-compose.server.yml` stands up the team server. To build the image yourself instead of pulling — required for the GPU variant, which is not published: ```bash docker build -t mempalace . # CPU docker build --build-arg EXTRAS="extract,spellcheck" -t mempalace . docker build -f Dockerfile.gpu -t mempalace:gpu . # CUDA; run with --gpus all ``` The GPU image is x86_64-only: `onnxruntime-gpu` publishes no aarch64 Linux wheels, so that last build fails on an ARM host (including Apple Silicon) with a dependency-resolution error rather than an obvious one. Note that a build from a clone uses whatever branch you checked out; `develop` is the default branch, so pull the published image if you want the released version. ## Storage backends ChromaDB is the default and needs no configuration. MemPalace also ships a pluggable backend contract, exercised across deliberately different substrates so the contract is never accidentally shaped around one vendor. Every non-default backend is opt-in. | Backend | Mode | Install | Namespaces | Lexical | Configure with | | ------- | ---- | ------- | :--------: | :-----: | -------------- | | `chroma` _(default)_ | Local (embedded) | bundled | – | ✓ | – | | `sqlite_exact` | Local (exact) | bundled | – | ✓ | – | | `milvus` | Local (Lite) · Server opt-in | `mempalace[milvus]` | ✓ | ✓ | `MEMPALACE_MILVUS_URI` | | `qdrant` | Server (REST) | bundled | ✓ | ✓ | `MEMPALACE_QDRANT_URL` | | `pgvector` | Server (Postgres) | `mempalace[pgvector]` | ✓ | ✓ | `MEMPALACE_PGVECTOR_DSN` | Select with `--backend <name>`, `MEMPALACE_BACKEND=<name>`, or `"backend": "<name>"` in `config.json`. See [Storage backends](/guide/configuration#storage-backends) for connection variables, namespace behavior, and deployment notes. ## Quickstart ```bash # Mine content into the palace mempalace mine ~/projects/myapp # project files mempalace mine ~/.claude/projects/ --mode convos # Claude Code sessions (scope with --wing per project) # Search mempalace search "why did we switch to GraphQL" # Load context for a new session mempalace wake-up ``` For Claude Code, Gemini CLI, [Antigravity](https://mempalaceofficial.com/guide/antigravity.html), MCP-compatible tools, and local models, see [mempalaceofficial.com/guide/getting-started](https://mempalaceofficial.com/guide/getting-started.html). --- ## Benchmarks All numbers below are reproducible from this repository with the commands in [`benchmarks/BENCHMARKS.md`](benchmarks/BENCHMARKS.md). Full per-question result files are committed under `benchmarks/results_*`. **LongMemEval — retrieval recall (R@5, 500 questions):** | Mode | R@5 | LLM required | |---|---|---| | Raw (semantic search, no heuristics, no LLM) | **96.6%** | None | | Hybrid v4, held-out 450q (tuned on 50 dev, not seen during training) | **98.4%** | None | | Hybrid v4 + LLM rerank (full 500) | ≥99% | Any capable model | The raw 96.6% requires no API key, no cloud, and no LLM at any stage. The hybrid pipeline adds keyword boosting, temporal-proximity boosting, and preference-pattern extraction; the held-out 98.4% is the honest generalisable figure. The rerank pipeline promotes the best candidate out of the top-20 retrieved sessions using an LLM reader. It works with any reasonably capable model — we have reproduced it with Claude Haiku, Claude Sonnet, and minimax-m2.7 via Ollama Cloud (no Anthropic dependency). The gap between raw and reranked is model-agnostic; we do not headline a "100%" number because the last 0.6% was reached by inspecting specific wrong answers, which `benchmarks/BENCHMARKS.md` flags as teaching to the test. **Other benchmarks (full results in [`benchmarks/BENCHMARKS.md`](benchmarks/BENCHMARKS.md)):** | Benchmark | Metric | Score | Notes | |---|---|---|---| | LoCoMo (session, top-10, no rerank) | R@10 | 60.3% | 1,986 questions | | LoCoMo (hybrid v5, top-10, no rerank) | R@10 | 88.9% | Same set | | ConvoMem (all categories, 250 items) | Avg recall | 92.9% | 50 per category | | MemBench (ACL 2025, 8,500 items) | R@5 | 80.3% | All categories | We deliberately do not include a side-by-side comparison against Mem0, Mastra, Hindsight, Supermemory, or Zep. Those projects publish different metrics on different splits, and placing retrieval recall next to end-to-end QA accuracy is not an honest comparison. See each project's own research page for their published numbers. **Reproducing every result:** ```bash git clone https://github.com/MemPalace/mempalace.git cd mempalace uv sync --extra dev # or: pip install -e ".[dev]" # see benchmarks/README.md for dataset download commands uv run python benchmarks/longmemeval_bench.py /path/to/longmemeval_s_cleaned.json ``` --- ## Knowledge graph MemPalace includes a temporal entity-relationship graph with validity windows — add, query, invalidate, timeline — backed by local SQLite. Usage and tool reference: [mempalaceofficial.com/concepts/knowledge-graph](https://mempalaceofficial.com/concepts/knowledge-graph.html). ## MCP server 44 MCP tools cover palace reads/writes, knowledge-graph operations, cross-wing navigation, drawer management, agent diaries, and agent coordination (logstream events + artifact handoffs). Installation and the full tool list: [mempalaceofficial.com/reference/mcp-tools](https://mempalaceofficial.com/reference/mcp-tools.html). ## Agents Each specialist agent gets its own wing and diary in the palace. Discoverable at runtime via `mempalace_list_agents` — no bloat in your system prompt: [mempalaceofficial.com/concepts/agents](https://mempalaceofficial.com/concepts/agents.html). ## Auto-save hooks Auto-save hooks for **Claude Code, Codex CLI, and Cursor IDE** save periodically and before context compression: - Claude Code + Codex → [mempalaceofficial.com/guide/hooks](https://mempalaceofficial.com/guide/hooks.html) - Cursor IDE (adds session-start recall and a transcript snapshot before compaction) → [mempalaceofficial.com/guide/cursor-hooks](https://mempalaceofficial.com/guide/cursor-hooks.html) If you are installing under time pressure, start with the [Claude Code retention setup checklist](https://mempalaceofficial.com/guide/claude-code-retention.html): wire the hooks, back up existing JSONL transcripts, and backfill them with `mempalace mine ~/.claude/projects/ --mode convos`. For per-message recall on top of the file-level chunks the hooks produce, run `mempalace sweep <transcript-dir>` periodically — it stores one verbatim drawer per user/assistant message, idempotent and resume-safe. --- ## Requirements - Python 3.9+ - A vector-store backend (ChromaDB by default) - ~300 MB disk for the embedding model. Onboarding (`python -m mempalace.onboarding`) offers `embeddinggemma-300m` (multilingual, 100+ languages, recommended) or `all-MiniLM-L6-v2` (English-only, ~30 MB). See the docstring at [`mempalace/embedding.py`](mempalace/embedding.py) for details and migration notes. - Optional — compute embeddings on a server instead of locally. Set `embedding_model: "openai-compat"` in `~/.mempalace/config.json` together with `embedding_api_url` / `embedding_api_model` (and `embedding_api_key` if the server needs auth) to use any OpenAI-compatible `/v1/embeddings` endpoint — LM Studio, llama.cpp, vLLM, Ollama's OpenAI shim, or a self-hosted server (e.g. a larger multilingual or GPU-served embedder). Each key is overridable via the matching `MEMPALACE_EMBEDDING_API_*` env var. When the endpoint is on your machine or LAN, no content leaves your network. Switching to it requires `mempalace repair rebuild-index` (different vector space). No API key is required for the core benchmark path. ## Docs - Getting started → [mempalaceofficial.com/guide/getting-started](https://mempalaceofficial.com/guide/getting-started.html) - CLI reference → [mempalaceofficial.com/reference/cli](https://mempalaceofficial.com/reference/cli.html) - Python API → [mempalaceofficial.com/reference/python-api](https://mempalaceofficial.com/reference/python-api.html) - Full benchmark methodology → [benchmarks/BENCHMARKS.md](benchmarks/BENCHMARKS.md) - Release notes → [CHANGELOG.md](CHANGELOG.md) - Corrections and public notices → [docs/HISTORY.md](docs/HISTORY.md) ## Contributing PRs welcome. See [CONTRIBUTING.md](CONTRIBUTING.md). ## License MIT — see [LICENSE](LICENSE). <!-- Link Definitions --> [version-shield]: https://img.shields.io/badge/version-3.8.0-4dc9f6?style=flat-square&labelColor=0a0e14 [release-link]: https://github.com/MemPalace/mempalace/releases [python-shield]: https://img.shields.io/badge/python-3.9+-7dd8f8?style=flat-square&labelColor=0a0e14&logo=python&logoColor=7dd8f8 [python-link]: https://www.python.org/ [license-shield]: https://img.shields.io/badge/license-MIT-b0e8ff?style=flat-square&labelColor=0a0e14 [license-link]: https://github.com/MemPalace/mempalace/blob/main/LICENSE [discord-shield]: https://img.shields.io/badge/discord-join-5865F2?style=flat-square&labelColor=0a0e14&logo=discord&logoColor=5865F2 [discord-link]: https://discord.com/invite/ycTQQCu6kn