Memory Arbiter MCP Server

mcp-name: io.github.billy12151/memory-arbiter-mcp

memory-arbiter-mcp

中文 | English

---

English

A lightweight, fully local MCP Server that gives your AI coding tools a shared memory store with built-in conflict arbitration.

Every tool — ZCode, Codex, Cursor, Claude Code — has its own memory. They don't talk to each other. Memory Arbiter fixes this: one SQLite database, all tools read and write through the same MCP protocol, conflicts are resolved by structured rules (not LLM guesswork).

Features

• Structured memory write: content, agent_id, workspace, tags, source_type, event_time, ingest_time, confidence, protection_level, and more.
• Source trust levels: user_confirmed > document_extracted > agent_generated > unknown.
• Dual timeline arbitration: resolves conflicts by user confirmation → event time → source trust → ingest time. Every decision comes with an explainable rationale.
• Locked protection: user_confirmed memories are automatically locked — no agent can overwrite them.
• Client policy system: per-client enable/disable, agent allow/deny lists for multi-agent governance.
• Graceful degradation: sqlite-vec → FTS5 → LIKE → JSONL backup. Never crashes.
• Zero cloud, zero LLM calls: pure local SQLite. No Postgres, Redis, or external services.

Quick Start

Requirements: Python 3.11+

# Clone
git clone https://github.com/billy12151/memory-arbiter-mcp.git
cd memory-arbiter-mcp

# Setup
python3.11 -m venv .venv
source .venv/bin/activate
pip install -r requirements.txt
pip install -e .

# Optional: semantic recall via sqlite-vec
pip install '.[vec]'

# Run
memory-arbiter-mcp

Connect Your Tool

Add to your tool's MCP config (see examples/ for ready-made templates):

{
  "mcpServers": {
    "memory-arbiter": {
      "command": "/path/to/memory-arbiter-mcp/.venv/bin/memory-arbiter-mcp",
      "env": {
        "MEMORY_ARBITER_CLIENT": "zcode",
        "MEMORY_ARBITER_AGENT_ID": "zcode-default",
        "MEMORY_ARBITER_DB_PATH": "~/.local/share/memory-arbiter/memory.sqlite3"
      }
    }
  }
}

Change MEMORY_ARBITER_CLIENT for each tool (zcode, codex, cursor, claude-code). All tools share the same DB_PATH — that's the whole point.

⚠️ New session required: MCP servers are loaded at session startup. Already-open sessions won't see the new tools. Start a fresh session after configuring.

Client Config Locations

MCP Tools

Data Migration

Moving to a new machine? Just copy the SQLite file:

# Copy the database
cp ~/.local/share/memory-arbiter/memory.sqlite3 /new/machine/~/.local/share/memory-arbiter/

# Reinstall the project (don't copy .venv — rebuild it)
python3.11 -m venv .venv
source .venv/bin/activate
pip install -e .

Testing

python3.11 -m pip install -r requirements.txt
python3.11 -m pytest

License

MIT

---

中文

一个轻量、完全本地运行的 MCP Server，给你的 AI 编程工具提供共享记忆库，内置冲突仲裁机制。

你同时用 ZCode、Codex、Cursor、Claude Code——每个工具都有各自的记忆，互不相通。Memory Arbiter 解决这个问题：一个 SQLite 数据库，所有工具通过同一个 MCP 协议读写，冲突由结构化规则仲裁，不依赖大模型。

核心能力

• 结构化写入：content、agent_id、workspace、tags、source_type、event_time、ingest_time、confidence、protection_level 等。
• 来源可信度：user_confirmed > document_extracted > agent_generated > unknown。
• 双时间轴仲裁：按 用户确认 → 事件发生时间 → 来源可信度 → 录入时间 的优先级判定，输出可解释的裁决理由。
• 锁定保护：user_confirmed 的记忆自动锁定，任何 Agent 都不能自动覆盖。
• 客户端策略：按客户端启用/禁用，Agent 级别的 allow/deny 白名单控制。
• 逐级降级：sqlite-vec → FTS5 → LIKE → JSONL 备份，不会崩。
• 零云依赖、零大模型调用：纯本地 SQLite，不需要 Postgres、Redis 或外部服务。

快速开始

要求：Python 3.11+

# 克隆
git clone https://github.com/billy12151/memory-arbiter-mcp.git
cd memory-arbiter-mcp

# 安装
python3.11 -m venv .venv
source .venv/bin/activate
pip install -r requirements.txt
pip install -e .

# 可选：启用语义召回增强（sqlite-vec）
pip install '.[vec]'

# 启动
memory-arbiter-mcp

接入工具

在你的工具的 MCP 配置中加入（完整示例见 examples/ 目录）：

{
  "mcpServers": {
    "memory-arbiter": {
      "command": "/path/to/memory-arbiter-mcp/.venv/bin/memory-arbiter-mcp",
      "env": {
        "MEMORY_ARBITER_CLIENT": "zcode",
        "MEMORY_ARBITER_AGENT_ID": "zcode-default",
        "MEMORY_ARBITER_DB_PATH": "~/.local/share/memory-arbiter/memory.sqlite3"
      }
    }
  }
}

每个工具改一下 MEMORY_ARBITER_CLIENT 标识（zcode、codex、cursor、claude-code），共享同一个 DB_PATH——这就是跨工具记忆共享的关键。

⚠️ 需要新建会话：MCP Server 在客户端启动时加载，已经打开的会话不会识别新添加的 Server。配置好后请新建一个会话。

客户端配置位置

MCP 工具

数据迁移

换电脑只需拷贝一个文件：

# 拷贝数据库
cp ~/.local/share/memory-arbiter/memory.sqlite3 新电脑:~/.local/share/memory-arbiter/

# 重新安装项目（.venv 不要拷贝，新机器上重建）
python3.11 -m venv .venv
source .venv/bin/activate
pip install -e .

测试

python3.11 -m pip install -r requirements.txt
python3.11 -m pytest

License

MIT