MemPatrol

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MemPatrol is a dependency-free toolkit for long-lived AI agents: memory hygiene (patrol), prompt-ready recall, and a judge-first conversation gate. It runs on plain SQLite, ships a CLI and a read-only MCP server, and does not depend on an IM framework.

SQLite memories ──► patrol / diagnose ──► auditable repairs (--apply + backup)
        │
        ├──────────► recall scorer ─────► prompt-ready memory block
        │                                      │
chat events ──► gatekeep ◄────────────────────┘
        └────► LLM judge ──► send / handoff / tool_task / drop

Why MemPatrol

• Deterministic by default. Audits, decay/consolidation plans, intent expiry and finish gates are pure functions. The LLM only appears where a human would otherwise hand-edit memory.
• Judge-first interjection. A small set of hard gates rejects the obvious "not now"; after that, the LLM judge decides whether there is a natural insertion point. Throttling limits rate, it does not silently veto.
• Portable. One memories table is enough. Map any SQLite schema with --schema, or let --schema auto inspect it. jieba is optional.
• Boring operations. Read-only by default; writes require --apply and take a snapshot first. Every release has offline eval and a real-corpus replay gate.
• No host lock-in. No AstrBot/QQ/Telegram types in the kernels. Any adapter can build the small Context/rows structures.

Architecture

flowchart LR
  A[(SQLite memory DB)] --> B[policy kernels<br/>orphan / decay / consolidate / intents / finish]
  B --> C[CLI diagnose + apply<br/>read-only by default]
  A --> D[recall scorer<br/>anchor + instruction separation]
  D --> E[prompt-ready block<br/>with provenance]
  F[chat events] --> G[gatekeep<br/>8 gates + directed path]
  H[LLM judge] --> G
  G --> I[send / handoff / tool_task / drop]
  D --> G
  C --> J[MCP stdio server]
  D --> J
  G --> J

Full component map: docs/ARCHITECTURE.md.

Install

pip install mem-patrol                 # from PyPI
# or: python -m pip install .
memorix --version                      # mem-patrol 0.3.1

The distribution is mem-patrol; the import package and original CLI remain memorix for compatibility. mem-patrol / mem-patrol-mcp are aliases.

Quickstart

# read-only diagnosis (works with any schema)
memorix diagnose --db messages.db --schema auto

# plan before writing; --apply creates a DB snapshot first
memorix decay --db messages.db
memorix decay --db messages.db --apply

# offline regression
python -m memorix.eval --suite all --baseline eval/baseline.json
python -m memorix.retrieval.bench      # 6/6
python -m memorix.gatekeep.bench       # 9/9

End-to-end: group-chat interjection

from memorix.gatekeep import Context, decide
from memorix.retrieval.context import recent_private_context
from memorix.retrieval.score import recall
from memorix.retrieval.store import load_rows

rows = load_rows("messages.db")
context = recent_private_context("messages.db", user_id)
memory = recall(user_message, rows=rows, context=context, user_id=user_id)

outcome = decide(
    Context(
        text=user_message,
        user_id=user_id,
        config={
            "enable_group_interjection": True,
            "group_interject_max_daily": 30,
            "group_interject_judge_min_consult_seconds": 10,
            "group_interject_min_interval_minutes": 1,
        },
    ),
    judge=llm_judge,  # returns {"should_reply": bool, "text": ..., "needs_tools": ...}
)
if outcome.action == "sent":
    send(outcome.text)

The judge is only called after the cheap gates pass. Directed messages (@/reply/name) take a fast path. Step-by-step walkthrough: docs/END-TO-END.md.

Recall backends (lexical default, vector optional)

from memorix.retrieval.provider import make_provider

provider = make_provider("lexical")                 # default, zero deps
# provider = make_provider("vector", embedder=embed_batch)  # bring your own embeddings
block = provider.recall(user_message, rows=rows, context=context, user_id=user_id)

VectorProvider is an optional path (cosine + embedding cache); no model is bundled. The ONNX adapter is in memorix.retrieval.vector_onnx (pip install 'mem-patrol[vector]'). Lexical remains the default until vector wins on the real corpus without regressions.

MCP

{
  "mcpServers": {
    "memorix": {
      "command": "memorix-mcp",
      "args": ["--profile", "both", "--db", "/path/to/messages.db"]
    }
  }
}

Six read-only tools: memorix_diagnose, memorix_orphan, memorix_recall, memorix_gate_check, memorix_judge_replay, memorix_eval. See docs/MCP.md.

Two modes

python -m memorix.profiles --list
memorix profile --name chat

Any SQLite schema

memorix diagnose --db my.db --schema schema.json   # explicit mapping
memorix diagnose --db my.db --schema auto          # auto-detect
MEMORIX_SCHEMA=schema.json memorix diagnose --db my.db

Only memories is required; status/finish report a clear SchemaError if message tables are not mapped. A privacy-preserving real-corpus replay is in eval/real_corpus.json: docs/REAL-CORPUS.md.

Quality and benchmarks

• 374 tests; CI on Python 3.10 / 3.11 / 3.12.
• Synthetic §10.3 replay: 6/6; real production replay: 6/6 current, 5/6 historical (one data gap documented, not an algorithm failure).
• On a 1,238-memory read-only snapshot: cold load ~0.18 s, warm recall median ~43 ms, injected block ~620 chars. Environment-specific; see docs/BENCHMARKS.md.

CI/CD

• .github/workflows/ci.yml — pytest + both benches + eval on Python 3.10/3.11/3.12.
• .github/workflows/release.yml — v* tag → test, build wheel/sdist, install smoke, GitHub Release assets.
• .github/workflows/publish.yml — manual PyPI upload via trusted publishing (OIDC; no token in secrets).

Docs

• Contributing · Roadmap
• Use cases · Architecture · End-to-end · Schema · MCP · Interjection · Real corpus · Comparison · Benchmarks · Vector design · Release · FAQ

License

MIT. See LICENSE. MIT was chosen for minimal adoption friction; it has no explicit patent grant (Apache-2.0, used by 0.2.0/0.2.1, does). See FAQ.md.