ai-houkai 0.1.6

Long-term memory system for AI agents — vector search, decay & reflection

AI-Houkai — Agent Memory System

A long-term memory system for AI agents backed by ChromaDB and exposed over MCP. Agents can remember, recall, and forget information across sessions — with automatic decay of stale memories and periodic reflection that condenses experience into knowledge.

Features

Feature	Description
Vector search	Cosine-space HNSW via ChromaDB + sentence-transformers
Memory types	episodic · semantic · procedural · feedback
Rich metadata	importance, tags, source, access tracking
Decay	Exponential forgetting — prune old, unimportant memories
Reflection	Cluster episodic memories → condense into semantic summaries
MCP server	Five tools for any MCP client (Claude Code, Claude Desktop)
Multi-provider	Claude · OpenAI · Ollama (local) agent examples

Layout

AI-Houkai/
├── ai_houkai/
│   ├── __init__.py               # convenience re-exports
│   ├── memory_system/
│   │   ├── __init__.py
│   │   ├── store.py              # MemoryStore + Memory dataclass
│   │   ├── decay.py              # DecayEngine — exponential forgetting
│   │   └── reflection.py        # ReflectionEngine — episodic → semantic
│   ├── mcp_server/
│   │   ├── __init__.py
│   │   └── server.py             # FastMCP server (5 tools)
│   └── installers/
│       ├── __init__.py
│       └── claude_code.py        # ClaudeCodeInstaller — register MCP w/ Claude Code
├── examples/
│   ├── 01_standalone.py          # pure-Python walkthrough, no LLM
│   ├── 02_ollama_local_network.py  # Ollama on LAN, fully offline
│   ├── 03_claude_desktop.py      # MCP auto-install for Claude Desktop
│   ├── 04_openai.py              # OpenAI GPT-4o / gpt-4o-mini
│   ├── 05_decay_reflection.py    # decay + reflection demo
│   ├── 06_claude_code.py         # Claude Code MCP integration
│   ├── claude_agent.py           # Claude Sonnet REPL (Anthropic SDK)
│   └── pip_package_example.py   # post-install usage walkthrough
├── tests/
│   ├── conftest.py               # isolated MemoryStore fixture (tmp_path)
│   ├── test_memory.py            # MemoryStore unit tests
│   ├── test_decay.py             # DecayEngine unit tests
│   ├── test_reflection.py        # ReflectionEngine unit tests
│   └── test_dispatch.py          # cross-provider _dispatch_tool tests
├── pyproject.toml
└── requirements.txt

Install

Modern Linux distros protect the system Python (PEP 668). Pick whichever approach fits your workflow — none requires --break-system-packages.

Virtual environment (recommended for development)

python3 -m venv .venv
source .venv/bin/activate        # Windows: .venv\Scripts\activate
pip install ai-houkai

pipx (recommended for the MCP server / CLI tool)

pipx installs CLI tools into isolated venvs and puts the script on your PATH automatically — no activation step needed.

sudo apt install pipx            # or: pip install --user pipx
pipx ensurepath                  # adds ~/.local/bin to PATH (one-time)

pipx install ai-houkai
ai-houkai-mcp                    # available everywhere

uv (fastest, modern)

curl -Lsf https://astral.sh/uv/install.sh | sh   # one-time install

uv venv && uv pip install ai-houkai               # project venv
# or run a script without a persistent install:
uv run --with ai-houkai python examples/pip_package_example.py

Extras

pip install "ai-houkai[claude]"   # + Anthropic SDK
pip install "ai-houkai[openai]"   # + OpenAI SDK (also covers Ollama)
pip install "ai-houkai[all]"      # all providers
pip install "ai-houkai[dev]"      # + pytest

The embedding model (all-MiniLM-L6-v2) downloads automatically on first use (~90 MB). Everything runs fully local — no API key required for the memory layer itself.

Quick-start

from ai_houkai.memory_system import MemoryStore

store = MemoryStore()                  # persists to ./.chroma

store.remember("Python's GIL blocks CPU parallelism",
               type="semantic", importance=0.85, tags=["python"])

for mem, score in store.recall("parallel execution", k=3):
    print(f"{score:.3f}  {mem.text}")

Roadmap

Designs for upcoming features (hybrid retrieval, conflict detection, memory linking) live in PROPOSALS.md.

Run the tests

pytest tests/ -v        # 79 tests

---

Examples

01 · Standalone (no LLM)

Full memory lifecycle — seed → recall with filters → access tracking → forget.

python examples/01_standalone.py

02 · Ollama (local network)

Conversational REPL using a local model over Ollama's OpenAI-compatible endpoint. No API key, no internet.

ollama pull llama3.1
OLLAMA_MODEL=llama3.1 python examples/02_ollama_local_network.py

Env var	Default
OLLAMA_BASE_URL	http://localhost:11434/v1
OLLAMA_MODEL	llama3.1
AI_HOUKAI_PATH	./.chroma

03 · Claude Desktop (MCP)

Auto-installs the MCP server into Claude Desktop's config.

python examples/03_claude_desktop.py            # preview config
python examples/03_claude_desktop.py --install  # write config
python examples/03_claude_desktop.py --demo     # simulated session

04 · OpenAI

GPT-4o / gpt-4o-mini with function calling.

export OPENAI_API_KEY=sk-...
python examples/04_openai.py
OPENAI_MODEL=gpt-4o AI_HOUKAI_PATH=~/.ai_houkai python examples/04_openai.py

Env var	Default
OPENAI_MODEL	gpt-4o-mini
AI_HOUKAI_PATH	temp dir

05 · Decay + Reflection

Shows both cognitive maintenance features with backdated timestamps.

python examples/05_decay_reflection.py

06 · Claude Code (MCP)

Gives the Claude Code CLI a persistent memory so it remembers project conventions, past debug sessions, and your preferences across every coding session.

# Option A — one-liner (recommended)
claude mcp add ai-houkai -- ai-houkai-mcp

# Option B — installer console script (after `pip install ai-houkai`)
ai-houkai-install-claude-code --install
ai-houkai-install-claude-code --verify
ai-houkai-install-claude-code --claudemd

# Option C — auto-patch ~/.claude/settings.json via the example script
python examples/06_claude_code.py --install

# Option D — preview the config block
python examples/06_claude_code.py

# Smoke-test
python examples/06_claude_code.py --verify

# Simulated coding session
python examples/06_claude_code.py --demo

# Print a CLAUDE.md snippet that teaches Claude how to use memory
python examples/06_claude_code.py --claudemd

The installed MCP block in ~/.claude/settings.json:

{
  "mcpServers": {
    "ai-houkai": {
      "command": "ai-houkai-mcp",
      "env": {
        "AI_HOUKAI_PATH": "~/.ai_houkai",
        "AI_HOUKAI_COLLECTION": "claude_code"
      }
    }
  }
}

The install logic lives in the reusable ai_houkai.installers.claude_code module — drop it into your own scripts:

from ai_houkai.installers import ClaudeCodeInstaller

ClaudeCodeInstaller(memory_path="~/.ai_houkai").install()

Recommended CLAUDE.md addition

Add the following to your project's CLAUDE.md so Claude Code knows when and how to use memory tools (run ai-houkai-install-claude-code --claudemd or python examples/06_claude_code.py --claudemd to generate it):

## Memory (AI-Houkai MCP)

- **remember** — store conventions, decisions, preferences
- **recall** — search before starting any task
- **forget** — remove outdated facts

| Situation | Action |
|---|---|
| User states a convention | `remember` with `type="procedural"` |
| User corrects you | `remember` correction, `forget` old fact |
| Starting a new task | `recall` relevant context first |

Claude agent (Anthropic SDK REPL)

export ANTHROPIC_API_KEY=sk-ant-...
AI_HOUKAI_PATH=/tmp/my_memory python examples/claude_agent.py

REPL commands: memories to list recent memories · quit to exit.

---

MCP server

Exposes the memory store to any MCP client.

ai-houkai-mcp
# or: python -m ai_houkai.mcp_server.server

Exposed tools: remember · recall · forget · list_recent · stats.

Environment variables:

Variable	Default
AI_HOUKAI_PATH	./.chroma
AI_HOUKAI_COLLECTION	ai_houkai

Claude Code (global):

claude mcp add ai-houkai -- ai-houkai-mcp

Claude Code (manual ~/.claude/settings.json):

{
  "mcpServers": {
    "ai-houkai": {
      "command": "ai-houkai-mcp",
      "env": { "AI_HOUKAI_PATH": "/your/memory/path" }
    }
  }
}

Claude Desktop — use examples/03_claude_desktop.py --install.

---

Decay

Memories fade over time based on age and importance.

score = importance × exp(−λ × days_since_last_access)

Default λ = 0.1 → half-life ≈ 7 days for a 0.5-importance memory. procedural memories are protected and never pruned.

from ai_houkai.memory_system import MemoryStore, DecayEngine

store  = MemoryStore()
engine = DecayEngine(store, decay_rate=0.1, min_score=0.05)

engine.prune(dry_run=True)   # preview
engine.prune()               # delete stale memories

Reflection

Clusters of semantically similar episodic memories are condensed into a single semantic summary (the Generative Agents pattern).

from ai_houkai.memory_system import MemoryStore, ReflectionEngine

store  = MemoryStore()
engine = ReflectionEngine(store, similarity_threshold=0.75)

engine.clusters()                    # inspect clusters
engine.reflect(dry_run=True)         # preview
engine.reflect(consolidate=True)     # create summaries + delete sources

Plug in any summarizer — including an LLM:

def llm_summarizer(memories):
    prompt = "\n".join(m.text for m in memories)
    return openai_client.chat.completions.create(
        model="gpt-4o-mini",
        messages=[{"role": "user", "content": f"Summarise: {prompt}"}],
    ).choices[0].message.content

engine = ReflectionEngine(store, summarizer=llm_summarizer)