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Yggdrasil MCP Server

@vondervuflya

リポジトリ

基本情報

カテゴリ

その他

トランスポート

stdio

作者

vondervuflya

投稿者

Sergey Cherkashin

Yggdrasil MCP Server について

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 の設定

以下の設定を使って、このサーバーを MCP 対応クライアントに追加してください。

{
  "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 のツール

ツール一覧はまだありません

この掲載には表示できるツール一覧がまだありません。サーバーにツールがないという意味ではありません。対応機能はプロジェクトのドキュメントをご確認ください。

上のボタンで一時的なサンドボックスでこのサーバーを実行し、ツール一覧を取得できます。

概要

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

よくある質問

1

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.

2

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.

3

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.

4

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.

5

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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