moyu-memory 2.8.1

Zero-trust memory toolkit for AI Agents. Pure Python, zero infrastructure, self-defending.

Your AI remembers every conversation. But —

• Is someone writing garbage into your memory?
• Did that private info you discussed yesterday leak into a file?
• Context window full — will you lose what matters?

MOYU is a security-first memory layer for AI Agents. Pure Python, one folder, plug and play. LLM-enhanced features are on by default; no API key? Silent degrade, core memory keeps working.

Install and go:

pip install moyu-memory
moyu quickstart    # 5-minute interactive demo, zero config

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Three things that make MOYU different

• 🛡️ Security built in — Injection detection (regex + 8-class LLM guard), PII redaction, file integrity verification, write burst protection. Security isn't an add-on, it's default.
• ⏳ Lifecycle on autopilot — Context compression, forgetting curve, memory merge — all automatic. No more losing important things when context fills up.
• 🧠 Retrieval + adaptive tuning — Semantic + keyword + recency + entity hybrid search with configurable weights. Search feedback feeds moyu tune which auto-adjusts weights over time.

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🏆 Comparison

Dimension	MOYU	Mem0	Letta	Zep	Cognee
Setup	pip, zero config	pip + API Key	Runtime setup	Cloud simple, self-host complex	uv pip install
External deps	Storage layer zero-dependency	LLM API + vector DB	LLM API + storage	Self-host needs graph DB	LLM API
Security	Injection defense + PII redaction + integrity + zero-trust, on by default	API Key + compliance	Framework isolation	Cloud SOC2/HIPAA	Tenant isolation
Retrieval	Semantic+BM25+time+entity, configurable weights + adaptive tuning	Semantic+BM25+entity 3-way fusion	Agent tool pagination	Temporal graph	Graph+vector hybrid
Lifecycle	Compression/forgetting/merge/scene classification, fully automatic	ADD-only, no forgetting	3-tier, auto pagination	Temporal graph auto versioning	Feedback learning, needs config
Knowledge Graph	Entity extraction + time-travel + distillation	Pro $249/mo	Indirect (external tools)	Temporal graph, all tiers	Core feature, full OSS
Offline	Fully offline	Partial (local embed)	Self-hostable	Self-host only	Fully local

Bottom line: MOYU excels at security, offline capability, lifecycle management, and configurable retrieval — areas where alternatives offer little to none. Choose by your scenario, not by feature count.

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🎮 Who is it for

• Your AI Agent needs persistent memory with real security
• Frequently hit context limits, need auto-compression without losing important content
• Worried about PII leaks — don't want phone numbers, IDs, API keys in memory files
• Want zero infrastructure — no Docker, no databases, no signups

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🔬 Full Capability Index

New here? Start with the "Three things that make MOYU different" section above, then the comparison table.

🛡️ Defense Layer (11)

#	Capability	Description
1	Content Security Gate	Pre-write injection blocking — 516 regex patterns + 8-class LLM recheck
2	Forensic Analysis	Detect injection patterns, JSON corruption, file tampering
3	Write Burst Protection	>30 writes/60s → rollback + 5-min lock
4	Tool Call Loop Detection	SHA256 fingerprint + exhaustive cycle scan + hard abort
5	PII Redaction	Bilingual: phones, IDs, bank cards, emails, SSNs, IPs, API keys
6	Password Verification	Pre-op confirmation + auto-lock after 3 failures (30 min)
7	Integrity Check & Recovery	SHA256 manifest + daily backups (3-day retention)
8	Memory Digital Signature	HMAC-SHA256 per-file signing + verification + auto-recover from signed backup. Disabled by default, set MOYU_SIGN_KEY to enable
9	User Isolation & Encryption (opt-in)	Per-user directories + AES-256-GCM encryption
10	LLM Security Guard	Regex-untouched inputs → LLM verdict (8 classes). Never blocks legitimate writes
11	Access Behavior Monitoring	Read burst detection (>100 reads/60s → alert). Every search is tracked.

🧠 Memory & Retrieval Layer (8) 2 LLM-Enhanced

#	Capability	Description
1	TEMPR Multi-Strategy Retrieval	Semantic + BM25 + time-weighted + entity + progressive content (summary→overview→full) + semantic dedup, configurable weights
2	Search Rerank LLM	LLM re-ranks candidates by semantic relevance (on by default, degrades without key)
3	Smart Summary LLM	Writes auto-refined by LLM — filler out, facts in
4	FastEmbed Local Embedding	Local ONNX vectorization, no API needed, auto-degrades to n-gram
5	SQLite FTS5 + MD5 Dedup	Full-text index + in-memory/batch double dedup
6	Search Feedback Collection	Explicit votes + implicit ref/correction signals — feeds adaptive tuning
7	Adaptive Weight Tuning	moyu tune — auto-optimizes retrieval weights from feedback data
8	Auto Memory Extraction	Dual-channel fact extraction from conversation: fast rules (27 patterns, 0 token cost) + LLM (semantic edge cases). Enabled by default on every moyu command.

📊 Knowledge Layer (3) 1 LLM-Enhanced

#	Capability	Description
1	Knowledge Graph LLM	Entity extraction + time-travel + relation invalidation + entity timeline + conflict auto-invalidation + distillation
2	Workflow Knowledge Base	Markdown indexing + keyword search
3	User Profile	Auto-extract preferences, habits, facts from conversation

⏳ Lifecycle Layer (5) 3 LLM-Enhanced

#	Capability	Description
1	Context-Aware Compression + Warning	Two-tier compression, originals preserved, auto-warning before compression
2	Task Map	Auto-generated Mermaid task graph on wake
3	Forgetting Curve LLM	Four gates (safety/access/scene/LLM semantic review) + LLM scene classification
4	Memory Merge LLM	Related memories auto-merged with LLM summary, originals preserved
5	Access Heat Tracking & Decay	Per-memory heat tracking (HOT/WARM/COLD) with 5%/day time decay + auto-decay on search, drives retrieval priority

🔄 Learning & Reflection (2)

#	Capability	Description
1	Learn from Corrections	Auto-detect correction signals, 3 identical → permanent behavioral rule
2	Self-Reflection	Cross-time association, contradiction detection, topic shift analysis

🔗 Integration Layer (6)

#	Capability	Description
1	Working Memory	Independent file, survives context compression
2	Cross-Session Bridge	10-turn summaries + 3-round conversations + state (topic, decisions, pending) auto-synced across sessions. Hermes users: zero-config via prefill. Other agents: add a line to system prompt (see below)
3	Auto-Update	GitHub release check + TOFU checksum + in-place update
4	Wake Orchestration	Check→backup→forget→merge→reflect→context→bridge — fully automatic
5	Memory Injection	moyu inject — standardized injection with built-in context warning
6	Defense Log	All defense events unified to defense_log.md — signature fails, content blocks, PII redactions, burst rollbacks, loop aborts. Hermes users get auto chat notifications. Others: configure defense_log.webhook in config.yaml

For non-Hermes agents — add this line to your Agent's system prompt to enable session continuation:

When starting a new conversation, read ~/.moyu/session_state.json and use its content to continue from the previous session's context.

🛡️ Security Assessment

MOYU's defense chain is a layered deterrent, not a silver bullet. Honest assessment:

Level	Threat	Coverage
🟢	Accidental misuse (fat-finger, mis-script)	~90%
🟢	Script-kiddie injection (known patterns)	~70%
🟡	Simple prompt injection (standard variants)	~65%
🟠	Professional adversarial injection (targeted bypass)	~25%
🟠	Semantic injection (metaphor, no keywords)	~60% (LLM layer)
🟢	Combined defense	1,769 test cases, 15 attack categories, 0% false positives. Run moyu benchmark --full to reproduce

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🚀 Quick Start

One-line install:

pip install moyu-memory

5-minute interactive demo:

moyu quickstart
# → Auto-stores sample memories, runs injection attack tests,
# → shows defense chain in action, reports results.
# → Zero config, no API key needed

Integrate with your Agent:

moyu inject "current conversation topic"
# → Outputs relevant memories (with context warning), ready for System Prompt injection

Or from your code:

from moyu_toolkit.moyu import inject_context
inject_context("current conversation topic")  # Auto-search, format, inject

Copy the toolkit (no pip needed):

pip install -r requirements.txt

Copy the moyu_toolkit/ folder into your project, run python3 moyu.py.

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🔌 MCP Integration

MOYU can be used as a Model Context Protocol (MCP) server, exposing its memory, search, and defense capabilities as tools for any MCP-compatible client — Hermes Agent, Claude Desktop, Cherry Studio, Kimi, and more.

How it works: MOYU runs as a local stdio subprocess. Client starts it on demand; no daemon, no network port.

Setup

pip install moyu-memory

Then add this to your MCP client configuration:

{
  "mcpServers": {
    "moyu": {
      "command": "uvx",
      "args": ["moyu-mcp@latest"]
    }
  }
}

Or use the Python entry point directly:

{
  "mcpServers": {
    "moyu": {
      "command": "python3",
      "args": ["-m", "moyu_toolkit.mcp_server"]
    }
  }
}

Available Tools

Tool	Description
search_memory	TEMPR semantic + keyword hybrid search. Returns top-k with relevance scores.
add_memory	Store a new memory with auto-deduplication. Returns memory ID.
memory_stats	Memory statistics: count, storage size, embedding status.
defense_scan	Security scan — injection detection, PII, prompt leaks.
memory_doctor	Full health check: integrity, redundancy, security events, storage.

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📋 Command Reference

Defense & Security

moyu setup moyu verify moyu unlock moyu check moyu audit moyu init moyu rules list moyu rules remove <pattern> moyu rules whitelist <pattern> moyu protect moyu benchmark moyu demo-attack moyu doctor moyu mutate moyu frequency stats moyu frequency unlock <name>

Memory & Retrieval

moyu search <query> moyu search --vote <id> good|bad moyu search --ns <ns> moyu inject <query> moyu config show moyu config set retrieval.weights.<dim> <val> moyu tune / --dry-run / --reset moyu stats moyu status moyu extract <text> moyu extract stats moyu memory detail <id> moyu memory heat-recalc

Knowledge Layer

moyu kg search <entity> moyu kg history <entity> moyu kb search <keyword>

Lifecycle & Context

moyu compress moyu context moyu forget moyu lifecycle moyu ref <name> moyu snapshot

Learning & Maintenance

moyu learn <text> moyu detect <text> moyu signals moyu quickstart moyu demo moyu reflect moyu setup agents moyu update

Session & Bridge

moyu session state moyu session prompt moyu session decision <text> moyu session pending <text> moyu session clear moyu bridge

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📚 Documentation

• FAQ & Anti-Patterns — Common pitfalls and solutions
• Python API Integration Guide — Code examples and integration patterns

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📁 File Structure

moyu_toolkit/
├── _llm_client.py            # Unified LLM client
├── agent_memory.py           # Vector memory engine + TEMPR retrieval
├── agent_memory_sqlite.py    # SQLite FTS5 search index
├── active_context.py         # Working memory
├── context_manager.py        # Context compression + warning + task map
├── forgetting_curve.py       # Forgetting curve + LLM review
├── memory_merge.py           # Memory merge
├── knowledge_graph.py        # Entity-relation knowledge graph
├── knowledge_base.py         # Workflow knowledge base
├── learner.py                # Learn from corrections
├── security.py               # Password + lockout
├── feedback.py               # Search feedback collection
├── tune.py                   # Adaptive weight tuning
├── quickstart.py             # 5-minute interactive demo
├── moyu.py                   # CLI entry point
├── moyu_wake.py              # Startup pipeline
├── defense_toolkit/
│   ├── integrity_checker.py  # File integrity + LLM guard
│   ├── forensic_patterns.json # 516 injection detection patterns
│   └── pii_redactor.py       # PII redaction
├── tests/
│   └── test_all.py           # Automated tests
├── config.yaml               # Configuration
└── requirements.txt

📜 License

MIT