Yggdrasil MCP Server

@vondervuflya

代码仓库

基本信息

分类

其他

传输方式

stdio

作者

vondervuflya

提交者

Sergey Cherkashin

关于 Yggdrasil MCP Server

Durable, local-first memory for AI coding agents over MCP — zero-dependency, curated & semantically de-duped, you own the data (SQLite + Markdown). Works with Claude Code, Codex & any MCP host.

#cli #memory #sqlite #mcp #embeddings #developer-tools #codex #ai-agents #claude #rag #local-first #coding-assistant #llm #ai-memory #model-context-protocol #claude-code

Yggdrasil MCP Server 配置

使用下面的配置,将此服务器添加到你的 MCP 客户端。

{
  "mcpServers": {
    "yggdrasil": {
      "command": "uvx",
      "args": [
        "--from",
        "yggdrasil-memory",
        "ygg",
        "mcp"
      ],
      "env": {
        "YGG_ENGINE_URL": "http://127.0.0.1:42069",
        "YGG_ENGINE_TOKEN": "YOUR_TOKEN"
      }
    }
  }
}

Yggdrasil MCP Server 工具

工具列表暂未提供

当前收录暂时没有可展示的工具列表，不代表服务没有工具。请查阅项目文档了解支持的能力。

点击上方按钮,在临时沙箱中运行此服务器并实时获取工具列表。

概览

What is Yggdrasil?

Yggdrasil is a local, persistent memory layer for AI coding agents like Claude Code, Codex, and any MCP-compatible tool. It stores project context, decisions, and gotchas across sessions and projects, eliminating the need to re-explain your work every time a new chat starts. The system runs as a tiny always-on daemon (~21 MB RAM) with zero dependencies and keeps everything on your machine.

How to use Yggdrasil?

Install inside Claude Code with two commands (/plugin marketplace add VonderVuflya/Yggdrasil then /plugin install yggdrasil) or via CLI using uvx --from yggdrasil-memory ygg install, npx yggdrasil-memory install, pipx, pip, Homebrew (brew install VonderVuflya/tap/yggdrasil), or a .mcpb file for Claude Desktop. Once running, agents interact with it through MCP tools: ygg_health, ygg_bootstrap, ygg_search, ygg_recall, ygg_remember, and ygg_materialize. Hooks automatically inject a project status summary (~300 tokens) at the start of each session.

Key features of Yggdrasil

Persistent memory survives across AI sessions and projects
One brain shared by Claude Code, Codex, and any MCP host
Cross-project recall (“this looks like project B — reuse it?”)
Curated, not captured: agent saves only what matters; governance dedupes and archives
Opt-in self-maintenance using a small local model (zero API tokens)
100% local, no cloud, no account, no telemetry

Use cases of Yggdrasil

Stop re-explaining your project’s decisions and gotchas to every new chat
Share the same memory across different AI tools (Claude Code, Codex)
Recall patterns from past projects to suggest reuse in a current one
Run a background consolidation agent that keeps memory tidy without external API calls
Keep all memory as plain Markdown notes viewable in Obsidian

常见问题

How does Yggdrasil store memory?

It uses SQLite with FTS5 indexing; no external database is needed. Optionally, local embeddings via Ollama improve recall@1 from 0.77 to 0.93 (recall@3 reaches 1.00). Each memory is also a plain Markdown file accessible in any Markdown editor.

What dependencies does Yggdrasil require?

Zero dependencies out of the box. The tool runs on SQLite + FTS5 bundled with the daemon. If you want enhanced recall, you can optionally connect to a local Ollama instance for embeddings.

Where does my data live?

All data stays completely on your machine. There is no cloud component, no account, and no telemetry. The daemon writes to a local SQLite database.

Which MCP tools does Yggdrasil expose?

It provides `ygg_health`, `ygg_bootstrap`, `ygg_search`, `ygg_recall`, `ygg_remember`, and `ygg_materialize`. Hooks automatically inject a context summary on session start.

Is Yggdrasil free and open source?

Yes, it is released under the AGPL-3.0 license. Source and full documentation are at https://github.com/VonderVuflya/yggdrasil.

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