Yggdrasil
About
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.
Explore
- 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
Setting up with Highlight
This MCP is not yet compatible with Highlight’s one-click setup. However, you can still use it with Highlight by following these steps:
- Download and install Highlight from highlightai.com/download
- Navigate to the plugins tab and select "Add Custom Plugin"
-
Configure the plugin with the settings below
Plugin Name
YggdrasilCommand (node, npx, python, etc.)Please refer to the README for specific instructions on how to obtain API keys or other required environment variables.
- Enable "Start Automatically" if you want the plugin to start when Highlight launches
From the repository
Inside Claude Code (two commands):
/plugin marketplace add VonderVuflya/Yggdrasil
/plugin install yggdrasil
Or via CLI (registers MCP tools with Claude Code and Codex):
uvx --from yggdrasil-memory ygg install
Also available via npx yggdrasil-memory install, pipx, pip, Homebrew (brew install VonderVuflya/tap/yggdrasil), and a .mcpb for Claude Desktop.
Claude Desktop / Cursor
Paste into your MCP client config file to install this server.
{
"mcpServers": {
"yggdrasil": {
"yggdrasil": {
"command": "uvx",
"args": [
"--from",
"yggdrasil-memory",
"ygg",
"mcp"
],
"env": {
"YGG_ENGINE_URL": "http://127.0.0.1:42069",
"YGG_ENGINE_TOKEN": "YOUR_TOKEN"
}
}
}
}
}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"
}
}
}Install
Inside Claude Code (two commands):/plugin marketplace add VonderVuflya/Yggdrasil
/plugin install yggdrasil
Or via CLI (registers MCP tools with Claude Code and Codex):
uvx --from yggdrasil-memory ygg install
Also available via npx yggdrasil-memory install, pipx, pip, Homebrew (brew install VonderVuflya/tap/yggdrasil), and a .mcpb for Claude Desktop.
Why
- 🧠 Persistent — decisions, lessons, and project status survive across sessions - 🔌 One brain, every tool — Claude Code, Codex, and any MCP host share the same memory - 🌐 Cross-project recall — "this looks like what you did in project B — reuse it?" - 🧹 Curated, not captured — the agent saves the few things that matter; governance dedupes and archives, never deletes - 🌱 Self-maintaining (opt-in) — a small local model consolidates memory in the background, zero API tokens - 🔒 100% local — no cloud, no account, no telemetryHow it works
A tiny always-on daemon (~21 MB RAM) your agents reach over MCP tools:ygg_health, ygg_bootstrap, ygg_search, ygg_recall, ygg_remember, ygg_materialize. Hooks auto-inject project status at session start (~300 tokens). Runs on SQLite + FTS5 with zero dependencies out of the box; optional local embeddings via Ollama lift recall@1 from 0.77 to 0.93 (recall@3 = 1.00, reproducible benchmark included). Every memory doubles as a plain-Markdown note you can read in Obsidian.
Source & docs: https://github.com/VonderVuflya/yggdrasil · License: AGPL-3.0Sign in to leave a review
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