Muninn

"Odin feared losing Muninn more than Huginn — losing memory is worse than losing thought."

Muninn is a personal MCP memory server for cross-client project continuity.

It is document-first: each project has one structured markdown document stored in projects.summary, and MCP tools save/recall/search those project documents directly.

Primary clients: Claude Code CLI, Claude Desktop, ChatGPT Mac App, Codex CLI

5-Minute Quickstart

1) Install

pip install muninn-mcp

Optional extras:

pip install "muninn-mcp[http]"    # HTTP transport support
pip install "muninn-mcp[github]"  # GitHub sync dependencies
pip install "muninn-mcp[all]"     # all optional deps

2) Configure one client (Claude Code example)

claude mcp add muninn -- uvx muninn-mcp

If you prefer local Python instead of uvx:

claude mcp add muninn -- muninn

3) First save (must be structured markdown)

In the client chat, send:

Save this to project "muninn-demo":

# Muninn Demo

## Overview
Personal MCP memory server for project continuity across tools.

## Key Decisions
- Use project-level markdown one-pager, not atomic memory writes.

## Current Status
- Initial setup complete.

## Open Questions
- What sections should be mandatory in every project document?

muninn_save rejects plain text without ## headers.

4) Recall it

Ask:

Recall muninn-demo

You should get the saved project document back.

Current Architecture

• Document-first MCP model: muninn_save replaces the entire projects.summary document for a project.
• 6 MCP tools: muninn_save, muninn_recall, muninn_search, muninn_status, muninn_manage, muninn_sync.
• Search is keyword-only: no semantic/vector search path in MCP tools.
• Storage: SQLite/libSQL with WAL mode; FTS5 tables are present in schema.
• Transport: stdio (default) and streamable HTTP.
• Dashboard: Next.js + React + Tailwind app in web/ (localhost workflow).

MCP Tools Reference (Actual Signatures)

Tool	Signature	Behavior
muninn_save	muninn_save(project: str, content: str) -> str	Save or replace a project's markdown document. Auto-creates project if missing. Requires markdown with ## headers.
muninn_recall	muninn_recall(project: str | None = None) -> str	Recall one project's document, or all active project documents when project is omitted.
muninn_search	muninn_search(query: str) -> str	Keyword search across project documents.
muninn_status	muninn_status() -> str	Status overview of projects.
muninn_manage	muninn_manage(action: Literal["set_status", "create_project", "delete_project"], project: str, status: str | None = None, value: str | None = None) -> str	Manage project lifecycle.
muninn_sync	muninn_sync(project: str) -> str	Sync linked GitHub repo (commits/issues/PRs) into memory for that project.

muninn_manage actions

Action	Required	Notes
set_status	project, status	status must be one of active, paused, idea, archived.
create_project	project	Optional value sets display name.
delete_project	project	Irreversible delete of project and its data.

muninn_sync prerequisites

• Project must exist.
• Project must have github_repo set (via dashboard or REST API).
• GITHUB_TOKEN is recommended for private repos and rate limits.

Client Configuration Examples

Claude Code CLI

claude mcp add muninn -- uvx muninn-mcp

Claude Desktop

~/Library/Application Support/Claude/claude_desktop_config.json:

{
  "mcpServers": {
    "muninn": {
      "command": "uvx",
      "args": ["muninn-mcp"]
    }
  }
}

Codex CLI

codex mcp add muninn -- uvx muninn-mcp
codex mcp list

ChatGPT Mac App (HTTP connector)

1. Start Muninn in HTTP mode:

MUNINN_API_KEY=your-secret-key muninn --transport http --host 127.0.0.1 --port 8000

2. In ChatGPT Mac App, add a custom MCP connector to:

http://127.0.0.1:8000/

3. Use bearer auth with the same key.

For remote/public access, run with a public URL and appropriate auth settings.

Running The Server

# stdio (default)
muninn

# HTTP
muninn --transport http --host 127.0.0.1 --port 8000

# HTTP with public URL (OAuth issuer host)
muninn --transport http --host 0.0.0.0 --port 8000 --public-url https://your-domain.example

# Reset data and instructions file
muninn --reset

HTTP auth mode priority:

1. MUNINN_OWNER_PASSWORD → OAuth 2.0
2. MUNINN_API_KEY → Bearer token
3. Neither set → no auth (local dev only)

Dashboard (Localhost)

# terminal 1: Muninn server
muninn --transport http --port 8000

# terminal 2: dashboard
cd web
npm install
npm run dev

Open http://localhost:3000.

Data & Environment

• Default DB path: ~/.local/share/muninn/muninn.db
• Override DB path: MUNINN_DB_PATH=/path/to/muninn.db
• OAuth PIN auth: MUNINN_OWNER_PASSWORD
• Bearer auth: MUNINN_API_KEY
• GitHub sync auth: GITHUB_TOKEN

Development

# Install dev deps
pip install -e ".[dev]"

# Run tests
python -m pytest tests/ -v

# Run server module directly
python -m muninn.server
python -m muninn.server --transport http --port 8000

Architecture

src/muninn/
  server.py       # FastMCP entry point (stdio + HTTP, CLI args)
  tools.py        # 6 MCP tool functions (document-first)
  store.py        # SQLite/libSQL store, WAL, FTS5 tables
  formatter.py    # LLM-readable formatter output
  models.py       # Dataclasses and validation
  auth.py         # Bearer middleware (HTTP)
  api.py          # Dashboard REST routes
  github_sync.py  # GitHub commits/issues/PR sync

License

MIT