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<img src="assets/banner.png" alt="mnemosyne OS" width="100%"> # mnemosyne OS <a href="https://pypi.org/project/mnemosyne-os/">PyPI</a> · <a href="https://github.com/FrankHu-HK/mnemosyne">GitHub</a> · <a href="README_CN.md">中文</a> <a href="https://pypi.org/project/mnemosyne-os/"><img src="https://img.shields.io/badge/PyPI-mnemosyne--os-blue?style=for-the-badge" alt="PyPI"></a> <a href="LICENSE"><img src="https://img.shields.io/badge/License-MIT-green?style=for-the-badge" alt="License: MIT"></a> <a href="https://www.python.org/"><img src="https://img.shields.io/badge/Python-3.8%2B-3776AB?style=for-the-badge&logo=python&logoColor=white" alt="Python 3.8+"></a> <a href="#-mcp-server"><img src="https://img.shields.io/badge/MCP-31%20Tools-00ADD8?style=for-the-badge" alt="Model Context Protocol"></a> <a href="#quick-start"><img src="https://img.shields.io/badge/dependencies-0-brightgreen?style=for-the-badge" alt="Zero dependencies"></a> <a href="https://pepy.tech/projects/mnemosyne-os"><img src="https://img.shields.io/pepy/dt/mnemosyne-os?style=for-the-badge" alt="Downloads"></a> <a href="https://x.com/mnemosyne_oos"><img src="https://img.shields.io/badge/X-@mnemosyne_oos-black?style=for-the-badge&logo=x&logoColor=white" alt="X"></a> <a href="README_TW.md"><img src="https://img.shields.io/badge/Lang-繁體中文-red?style=for-the-badge" alt="繁體中文"></a> <a href="README.es.md"><img src="https://img.shields.io/badge/Lang-Español-orange?style=for-the-badge" alt="Español"></a> <a href="README.ru.md"><img src="https://img.shields.io/badge/Lang-Русский-blue?style=for-the-badge" alt="Русский"></a> <a href="README.de.md"><img src="https://img.shields.io/badge/Lang-Deutsch-lightgrey?style=for-the-badge" alt="Deutsch"></a> <a href="README.th.md"><img src="https://img.shields.io/badge/Lang-ไทย-blue?style=for-the-badge" alt="ไทย"></a> <a href="README.ko.md"><img src="https://img.shields.io/badge/Lang-한국어-green?style=for-the-badge" alt="한국어"></a> <a href="README.ja.md"><img src="https://img.shields.io/badge/Lang-日本語-red?style=for-the-badge" alt="日本語"></a> **Mnemosyne OS 8.0.0** — a zero-dependency, local-first AI memory system. Graph memory, multimodal ingestion, reranking, temporal reasoning, a hash-chained audit ledger, lossless compression, and 31 MCP tools. > The only AI memory engine whose **core genuinely carries zero third-party > dependencies** — no vector database, no LLM runtime, no cloud account. > `install_requires` is an empty list. It runs on a laptop, a server, or > serverless infrastructure alike. Use it as a **Python library**, a **CLI**, an **HTTP API**, or an **MCP server**. --- ## 🚀 Quick start ### Install ```bash pip install mnemosyne-os # core: zero third-party dependencies ``` ### Remember and recall without configuring anything ```python from mnemosyne import Memory m = Memory() # built-in embedder + rule-based extractor m.add("I prefer dark mode and use vim keybindings. My name is Alice.", user_id="alice") for hit in m.search("what does alice prefer", filters={"user_id": "alice"})["results"]: print(f"{hit['score']:.3f} {hit['memory']}") ``` Offline, no API key, no model download, no database to install — which is what makes the next section possible. ### Attach real models only once recall needs to be stronger ```python from mnemosyne import Memory m = Memory.from_config({ "llm": {"provider": "openai", "config": {"model": "gpt-4o-mini"}}, "embedder": {"provider": "openai", "config": {"model": "text-embedding-3-small"}}, "vector_store": {"provider": "qdrant", "config": {"url": "http://localhost:6333"}}, "reranker": {"provider": "cohere", "config": {"api_key": "..."}}, "graph_store": {"provider": "builtin"}, }) ``` Every component is independently optional. When a provider cannot be built it falls back to the built-in equivalent and **says so** — nothing degrades silently: ```python m.describe()["degraded"] # {'llm': {'requested': 'openai', 'used': 'rules', 'reason': 'no API key configured', # 'hint': 'Set MNEMOSYNE_LLM_OPENAI_API_KEY ...'}} ``` ### Or drive it from the command line ```bash mnemosyne init mnemosyne add "I prefer dark mode and vim keybindings" --user-id alice mnemosyne search "what does alice prefer" --user-id alice mnemosyne list --user-id alice mnemosyne event --limit 10 mnemosyne --agent search "preferences" --user-id alice # JSON envelope for tool loops ``` ### Or expose it over MCP ```json { "mcpServers": { "mnemosyne": { "command": "python", "args": ["-m", "mnemosyne.webui.mcp_server", "--brain-dir", "./mem", "--namespace", "default"], "env": { "MNEMOSYNE_MCP_TOKEN": "<random 32+ chars>" } } } } ``` ### Or serve it over HTTP ```bash mnemosyne-web --port 9090 # console and REST share one port curl -X POST http://127.0.0.1:8788/v3/memories/add/ \ -H "Authorization: Bearer $MNEMOSYNE_API_KEY" -H "Content-Type: application/json" \ -d '{"messages":[{"role":"user","content":"I moved to Berlin in 2023."}],"user_id":"alice"}' ``` --- ## 📊 Benchmarks Measured with the harness shipped in this repository. Reproduce with `scripts/verify_recall_quality.py` and `scripts/verify_precision_recall.py`. | Benchmark | Score | What it measures | | --- | --- | --- | | LongMemEval | **96.2** | long-horizon conversational recall | | LoCoMo | **94.8** | multi-session dialogue memory | | BEAM (1M) | **68.5** | recall under a 1M-token context budget | | BEAM (10M) | **53.9** | recall under a 10M-token context budget | Scores are out of 100. --- ## 🧩 Capabilities <table> <tr><td>Memory API</td><td><code>Memory</code> / <code>AsyncMemory</code> / <code>MemoryClient</code> with a complete method surface: <code>add</code> <code>get</code> <code>get_all</code> <code>search</code> <code>update</code> <code>delete</code> <code>delete_all</code> <code>history</code> <code>reset</code> <code>close</code> <code>from_config</code>.</td></tr> <tr><td>Four-dimensional scoping</td><td><code>user_id</code> / <code>agent_id</code> / <code>run_id</code> / <code>app_id</code> — enforced by physical isolation: one SQLite file per scope, rather than shared rows with a filter applied.</td></tr> <tr><td>Filter language</td><td><code>eq</code> <code>ne</code> <code>gt</code> <code>gte</code> <code>lt</code> <code>lte</code> <code>in</code> <code>nin</code> <code>contains</code> <code>icontains</code> <code>wildcard</code>, with arbitrarily nested <code>AND</code>/<code>OR</code>/<code>NOT</code>.</td></tr> <tr><td>Single-pass ADD-only extraction</td><td>One model call per write; memories accumulate and are never overwritten. Because nothing is rewritten, a bad extraction only introduces noise — it can never destroy a real fact.</td></tr> <tr><td>Graph memory, always on</td><td>Entity linking and multi-hop traversal live in the same SQLite file. No external graph database required.</td></tr> <tr><td>Multimodal ingestion</td><td>Accepts the OpenAI, Anthropic and Gemini image content shapes (plus audio). With a vision model configured it stores a description; without one it stores the reference — nothing is dropped.</td></tr> <tr><td>Multi-signal retrieval</td><td>Semantic + BM25 keyword + entity graph + temporal + tag, fused with calibrated relevance floors and a lexical fallback.</td></tr> <tr><td>Temporal reasoning</td><td>Observation dates, relative-time resolution, expiry semantics, and per-entity version chains.</td></tr> <tr><td>Tiered memory</td><td>Hot / warm / cold tiers with forgetfulness economics: low-value memories are demoted and compressed, never silently deleted.</td></tr> <tr><td>Lossless compression (AIC)</td><td>Compresses a memory into pointer + structured facts + content atoms. Numbers, dates, amounts and model numbers survive at every tier; <code>expand()</code> recovers the original text byte-for-byte and verifies its hash.</td></tr> <tr><td>Hash-chained audit ledger</td><td>A SHA-256 chain; <code>verify_integrity()</code> detects tampering and names the exact entry that changed.</td></tr> <tr><td>Async API and events</td><td><code>AsyncMemory</code> for high-throughput writes, plus a persisted operation log so an accepted write stays visible across processes.</td></tr> <tr><td>Chinese-optimised</td><td>Bigram tokenisation + FTS5 + a built-in synonym dictionary, with full Latin-script support.</td></tr> <tr><td>Safety notary</td><td>Detects credentials, invisible Unicode and HTML injection before a write lands, and redacts at field level.</td></tr> </table> --- ## 🔌 Integrations Every adapter is optional. **stdlib** adapters need no third-party package at all — they speak HTTP directly through `urllib`. **sdk** adapters import their SDK lazily and tell you exactly which package is missing. ### LLM providers (20) | Transport | Providers | | --- | --- | | **stdlib HTTP** | `openai` `openai_structured` `azure_openai` `azure_openai_structured` `ollama` `anthropic` `gemini` `groq` `together` `deepseek` `minimax` `xai` `sarvam` `openrouter` `litellm` `lmstudio` `vllm` | | **sdk** | `langchain` `aws_bedrock` | | **built-in** | `rules` — a deterministic offline extractor, which is why `add()` works with no model configured at all | ### Embedders (13) | Transport | Providers | | --- | --- | | **stdlib HTTP** | `openai` `azure_openai` `ollama` `gemini` `vertexai` `together` `lmstudio` `huggingface` | | **sdk** | `fastembed` `langchain` `aws_bedrock` | | **built-in** | `builtin` (128-dim, zero-dependency, deterministic) · `hashing` (any dimension, offline) | ### Vector stores (28) | Transport | Stores | | --- | --- | | **embedded** | `builtin` (one SQLite file holds both memories and vectors) · `memory` · `generic` (declarative REST) | | **stdlib HTTP** | `qdrant` `pinecone` `elasticsearch` `opensearch` `weaviate` `upstash_vector` `turbopuffer` | | **sdk** | `chroma` `pgvector` `milvus` `mongodb` `redis` `valkey` `azure_ai_search` `azure_mysql` `baidu` `cassandra` `databricks` `faiss` `langchain` `neptune` `oracledb` `s3_vectors` `supabase` `vertex_ai_vector_search` | ### Graph stores (6) `builtin` (native SQLite triples) · `neo4j` · `memgraph` · `neptune` · `kuzu` · `sparql` (any SPARQL 1.1 endpoint) ### Rerankers (5) `llm` · `cohere` · `zero_entropy` · `huggingface` · `sentence_transformer` ### Framework adapters LangChain · LlamaIndex · CrewAI · Dify · n8n · Vercel AI SDK · Ollama · MCP (stdio + Streamable HTTP) --- ## 🛠 MCP server Runs over stdio JSON-RPC: ```bash export MNEMOSYNE_MCP_TOKEN="your-secret-token" # optional, but recommended python -m mnemosyne.webui.mcp_server --brain-dir ./mem --namespace default ``` **31 tools** — twenty native, plus eleven that reuse the conventional agent-memory tool names, so an existing MCP client can be pointed at Mnemosyne without rewriting its tool definitions. **Native (20):** | Tool | Purpose | | --- | --- | | `retain` | Store one memory | | `recall` | Retrieve memories | | `retain_batch` | Bulk write, roughly 15× faster | | `forget` | Forget a memory — by id, or by locating it with a natural-language query | | `capsule` | Compress a memory into pointer + facts + atoms | | `expand` | Recover a capsule's original text byte-for-byte | | `recall_health` | Read-only recall quality metrics | | `consolidate` | Merge near-duplicate memories into one representative | | `reflect` | Statistics, frequent entities, conflict detection, cognitive patterns | | `dedup` | Detect duplicates and near-duplicates | | `graph_query` | Knowledge-graph traversal | | `temporal_query` | Version-chain queries | | `list_projects` | List isolated projects | | `doctor` | Health check — integrity, counts, disk, backend state | | `stats` | Runtime statistics | | `audit` | Audit-chain queries | | `confidence_history` | Confidence trajectories | | `memory/export-v1` | Export via the Memory Exchange Protocol | | `memory/import-v1` | Import via the Memory Exchange Protocol | | `memory/claim` | Take over memories from an external export | **Client-compatible (11):** | Tool | Purpose | | --- | --- | | `add_memory` | Save text or conversation history for a user/agent | | `search_memories` | Semantic search with filters | | `get_memories` | Structured filter + paginated listing | | `get_memory` | Fetch one by id | | `update_memory` | Overwrite text and/or metadata | | `delete_memory` | Delete one | | `delete_all_memories` | Clear a scope | | `delete_entities` | Delete entities and cascade | | `list_entities` | List users/agents/apps/runs | | `list_events` | List memory operations | | `get_event_status` | Poll an async operation | --- ## 🌐 Self-hosted REST API One process, one port, accepting `X-API-Key`, `Bearer` and `Token` auth headers. The console and the API share the same listener. | Method | Path | Purpose | | --- | --- | --- | | `GET` | `/v1/status/` | Liveness probe + live configuration report | | `GET` | `/v1/providers/` | Every provider and its current availability | | `POST` | `/v3/memories/add/` | Extract and store (async, returns an event id) | | `POST` | `/v3/memories/search/` | Semantic search | | `POST` | `/v3/memories/get-all/` | Filtered listing | | `GET` / `PUT` / `DELETE` | `/v3/memories/{id}/` | Fetch / update / delete one | | `DELETE` | `/v3/memories/` | Clear a scope | | `GET` | `/v3/memories/{id}/history/` | Change history | | `GET` | `/v1/event/{id}/` · `/v1/events/` | Poll / list operations | | `GET` / `DELETE` | `/v2/entities/` | List / delete scopes | | `POST` | `/v3/graph/{add,search,get-all,delete-all}/` | Graph memory | | `POST` | `/v1/capsule/` · `/v1/expand/` | Lossless compression | | `GET` | `/v1/integrity/` | Ledger verification | | `GET` / `POST` / `DELETE` | `/v1/keys/` | API key management | --- ## 🧠 Python API ```python from mnemosyne import Memory, AsyncMemory, MemoryClient # --- extraction / scope / filters --------------------------------------------- m = Memory() m.add([{"role": "user", "content": "I moved to Berlin in 2023."}], user_id="alice", metadata={"source": "onboarding"}, observation_date="2023-06-01") m.add("The invoice number is INV-2024-001.", user_id="alice", immutable=True) hits = m.search("where does the user live", filters={"user_id": "alice", "AND": [{"source": {"eq": "onboarding"}}]}, top_k=5, threshold=0.1, rerank=False, explain=True) # --- multimodal --------------------------------------------------------------- m.add([{"role": "user", "content": [ {"type": "text", "text": "My new desk."}, {"type": "image_url", "image_url": {"url": "https://example.com/desk.jpg"}}, ]}], user_id="alice") # --- graph memory ------------------------------------------------------------- m.graph_add("Jobs founded Apple in Cupertino.", user_id="alice") m.graph_search("Apple", filters={"user_id": "alice"}) # --- async and events --------------------------------------------------------- async def ingest(): am = AsyncMemory() await am.add_many([{"messages": t, "options": {"user_id": "alice"}} for t in transcripts]) ``` `Memory`, `AsyncMemory` and `MemoryClient` also accept the conventional agent-memory call shape used by other memory libraries, so code already written against that shape can switch by changing only the import. See [docs/COMPATIBILITY.md](docs/COMPATIBILITY.md). The engine's own capabilities hang off the same object: ```python from mnemosyne import MemoryBrain brain = MemoryBrain("./memories", enable_embeddings=True) brain.ensure_init() brain.retain("His laptop is an ASUS VivoBook Pro 14", fast=True) results = brain.recall("what are that machine's specs", k=5) results, cost = brain.recall("that machine's specs", k=5, budget_tokens=100) cap = brain.capsule("<memory_id>", budget_tokens=60) # pointer + facts + atoms brain.expand(cap["ref"]) # byte-exact recovery brain.verify_integrity() # SHA-256 ledger check ``` --- ## 📂 Layout ``` mnemosyne/ ├── api/ # the memory API: Memory / AsyncMemory / MemoryClient │ ├── memory.py # engine-backed client │ ├── config.py # MemoryConfig + dimension consistency checks │ ├── filters.py # filter language -> predicates │ ├── extract.py # single-pass ADD-only extraction │ ├── multimodal.py # image / audio attachment parsing │ ├── events.py # persisted operation log │ └── client.py # embedded + HTTP transports ├── providers/ # optional component adapters (72 in total) │ ├── llms.py # 20 LLM providers │ ├── embedders.py # 13 embedder providers │ ├── vector_stores.py # 28 vector stores │ ├── graph_stores.py # 6 graph stores │ ├── rerankers.py # 5 rerankers │ ├── vision.py # three image wire formats │ └── transport.py # stdlib HTTP + retries + credential redaction ├── brain.py # MemoryBrain — the engine facade ├── capsule.py # AIC lossless compression ├── retrieval.py # multi-signal fusion and relevance calibration ├── graph.py # temporal triple store ├── notary.py # pre-write trust pipeline ├── cli.py # native CLI ├── api_cli.py # client-API CLI └── webui/ ├── web_server.py # console + REST host ├── api_routes.py # /v1 /v2 /v3 routes ├── mcp_server.py # 20 native MCP tools └── mcp_api.py # 11 client-compatible MCP tools storage/ # SQLite backend, hash-chained ledger, plugin SDK security/ # contradiction detection, security reporting scripts/ # verification scripts docs/ # acceptance guide, recall strategy, compatibility ``` --- ## ✅ Tests ```bash python verify.py # self-check python scripts/verify_api.py # client API verification, fully offline python scripts/verify_memory_lifecycle.py --brain-dir ./mem --src-root . python scripts/verify_precision_recall.py # offline precision regression python scripts/verify_recall_quality.py # end-to-end recall quality ``` --- ## 📚 Documentation - [docs/COMPATIBILITY.md](docs/COMPATIBILITY.md) — the conventional agent-memory call shape - [docs/ACCEPTANCE_GUIDE.md](docs/ACCEPTANCE_GUIDE.md) — acceptance criteria and the script for each - [docs/RECALL_STRATEGY.md](docs/RECALL_STRATEGY.md) — how retrieval is assembled and budgeted - [docs/KNOWN_DEFECTS.md](docs/KNOWN_DEFECTS.md) — confirmed defects, with measurements and fixes - [docs/DEPLOY_DEEPSEEK_HARNESS.md](docs/DEPLOY_DEEPSEEK_HARNESS.md) — MCP deployment walkthrough - [CHANGELOG.md](CHANGELOG.md) — version history --- ## 📄 License MIT License — see [LICENSE](LICENSE). Built by the Mnemosyne OS contributors.

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