MCP 服务器

litopys

Persistent graph-based memory for AI agents, stored as plain markdown — no vector DB. Typed nodes and 11 relation types via 5 MCP tools (search, get, create, link, related), stdio and HTTP/SSE transports.

README

📜 Litopys

A living chronicle for your AI.

Persistent graph-based memory that survives across sessions and clients. Built for Claude Code, Claude Desktop, and any MCP-compatible agent.

litopys-dev.github.io/litopys — install, screenshots, and quick-start

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Why Litopys?

Memory systems for AI agents today force a tradeoff: either heavy vector databases with subprocess leaks and ~500 MB RAM footprint, or flat markdown files that don't scale past a few dozen notes.

Litopys takes a third path: a typed graph of knowledge stored in plain markdown, served through a thin MCP layer (~75 MB RAM), editable by hand, queryable by both keyword and structure. Litopys means "chronicle" in Ukrainian — because that's exactly what your AI's memory should be: a living record of what it learned about you, when, and why.

Features

🧠 Typed graph — 6 node types (person, project, system, concept, event, lesson) with 11 first-class relations
🔌 MCP-native — works with Claude Code, Claude Desktop, Cursor, Cline, or any MCP client (see docs/integrations)
📝 Markdown-first — every node is a plain .md file with YAML frontmatter. Hand-editable, grep-able, git-versioned
🤖 Model-agnostic extractor — Anthropic, OpenAI, or local Ollama. Pick by your resource/cost budget (see Resource footprint below). Facts flow through a quarantine so nothing lands unreviewed
🌐 Web dashboard — browse, search, edit, visualize the graph, and review quarantine at http://localhost:3999
🔐 Stays local — graph lives in ~/.litopys/graph/ as files; the server binds to 127.0.0.1 by default; no telemetry

Dashboard

Screenshots taken against a synthetic demo graph bundled in docs/screenshots/ — not the author's personal notes.

Status

v0.1.2 is out — prebuilt binaries for Linux / macOS / Windows (x64 + arm64), with SHA-256 checksums verified by install.sh. Security release on top of the v0.1.1 stable line — see the CHANGELOG. Public surfaces (MCP tools, CLI, JSON export schemaVersion: 1, on-disk markdown layout) are frozen; breaking changes will ship as 0.2.x.

Core graph, MCP server (5 tools, stdio + HTTP/SSE), extractor + quarantine + weekly digest, timer-daemon, dashboard (read + write + graph viz + quarantine review), identity-resolution guardrails, single-binary build, one-line installer, per-client integration docs — all shipped. See What's next for the planned follow-ups.

Resource footprint

Honest numbers from the author's own install (Ubuntu, Bun 1.x). The MCP server is cheap; the extractor is where the bill shows up, and it depends on which adapter you pick.

Component	RAM	When it costs
MCP server (stdio or HTTP)	~75 MB	always, while a client is connected
Viewer / web dashboard	~50 MB	optional, only while running
Extractor — Anthropic / OpenAI	0 locally	per API call (tokens), no local RAM
Extractor — Ollama + 3B model	~2–3 GB	only during a tick, unloaded after
Extractor — Ollama + 7B model	~5 GB	only during a tick, unloaded after

So the minimum resident cost is ~75 MB for the MCP server. Extraction is optional — you can run Litopys read/write-only from your agent and never start the daemon. If you do enable extraction, the local-Ollama route trades cash for RAM; the Anthropic/OpenAI route trades RAM for cents per session. Ollama's keep_alive means the 3B/7B figures are transient — the model drops out of RAM a few minutes after the tick finishes.

Quick Start

One-line install (Linux / macOS):

curl -fsSL https://raw.githubusercontent.com/litopys-dev/litopys/main/install.sh | sh

This downloads a single ~100 MB binary to ~/.local/bin/litopys, initializes ~/.litopys/graph/ with the required subdirectories, and prints MCP registration hints.

Pin a specific version by placing the assignment after the pipe — env vars set before curl only scope to curl itself, not the piped shell:

curl -fsSL https://raw.githubusercontent.com/litopys-dev/litopys/main/install.sh | LITOPYS_VERSION=v0.1.2 sh

Then register the MCP server with your client:

# Claude Code
claude mcp add litopys -- ~/.local/bin/litopys mcp stdio

// Claude Desktop — ~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "litopys": {
      "command": "/home/you/.local/bin/litopys",
      "args": ["mcp", "stdio"]
    }
  }
}

Restart the client. The litopys://startup-context resource auto-loads the owner profile, active projects, recent events, and key lessons on every new session. The agent reads/writes through five MCP tools: litopys_search, litopys_get, litopys_related, litopys_create, litopys_link.

Full client-specific recipes live in docs/integrations/ — Claude Code, Claude Desktop, Cursor, Cline, ChatGPT Connectors, Gemini.

Remote (HTTP/SSE) mode

For remote clients (Claude Desktop connectors, browser-based MCP hosts):

LITOPYS_MCP_TOKEN=your-secret litopys mcp http
# listens on 127.0.0.1:7777 by default
# set LITOPYS_MCP_BIND_ADDR=0.0.0.0 + TLS proxy for remote exposure
# set LITOPYS_MCP_CORS_ORIGIN=https://your-client to enable CORS

Dev install (from source)

git clone https://github.com/litopys-dev/litopys.git
cd litopys
bun install
bun run build:binary       # produces dist/litopys

Optional — daemon for long-running transcripts

cp packages/daemon/systemd/litopys-daemon.{service,timer} ~/.config/systemd/user/
systemctl --user enable --now litopys-daemon.timer

Optional — web dashboard autostart

The dashboard (litopys viewer) can run as a systemd user service so it comes back after every reboot. Listens on 127.0.0.1:3999 by default — no public exposure, reach it over LAN / WireGuard.

litopys viewer install          # writes unit, daemon-reload, enable --now
systemctl --user status litopys-viewer

# Remove:
litopys viewer uninstall

Auth (writes only). GET endpoints (browse, search, graph view) are open. Mutating endpoints (create / edit / delete a node, accept-or-reject quarantine) require LITOPYS_VIEWER_TOKEN:

# Generate any random string and put it in the env:
export LITOPYS_VIEWER_TOKEN="$(openssl rand -hex 32)"
litopys viewer

Without the token the dashboard runs read-only on loopback and refuses mutating requests entirely on non-loopback binds. The web UI prompts for the token on the first 401 and remembers it in localStorage. You can also pass it once via ?token=... and it gets stripped from the URL after capture.

Or set LITOPYS_ENABLE_VIEWER=1 when running install.sh to enable it as part of the one-line install. Requires loginctl enable-linger $USER if you want the dashboard to stay up across logouts.

Integrity check

litopys check           # human-readable report, grouped by error kind
litopys check --json    # { nodeCount, edgeCount, errorCount, errors[] } for CI

Loads and resolves the entire graph, then flags broken refs, duplicate ids, wrong-typed relations, and parse/validation failures. Exits non-zero when issues are found — drop it into a git pre-push hook or CI step so drift never lands silently.

Backing up your graph

Litopys stores everything as plain markdown in ~/.litopys/graph/, so any tool that versions files works. Two common approaches:

Git + private remote (incremental history, offsite, free):

cd ~/.litopys
git init
git add graph/ .gitignore README.md
git commit -m "baseline"
gh repo create my-litopys-graph --private --source=. --push

From then on, every session-end hook or manual accept leaves your working tree dirty — periodically git add -A && git commit -m "sync" && git push to keep the backup current. Your graph contains personal facts, so keep the remote private.

JSON snapshot (portable, diffable, tool-friendly):

litopys export > graph.json              # compact
litopys export --pretty > graph.json     # indented, VCS-friendly
litopys export --no-body > meta.json     # metadata only, strip markdown bodies

The dump carries meta (exportedAt, counts, schemaVersion) plus all nodes sorted by id and edges sorted by (from, relation, to) — deterministic across runs, so diff graph-yesterday.json graph-today.json tells you exactly what the LLM/daemon added. Feed it to analysis tools, migrate between hosts, or commit alongside code.

Restore from a snapshot on a fresh host (or after a reinstall):

litopys import graph.json --dry-run   # preview the plan
litopys import graph.json             # create new nodes, skip existing ones
litopys import graph.json --force     # also overwrite existing ids

Default is conservative — existing nodes are never touched unless you pass --force. Every node is validated against the schema up-front, so a corrupt snapshot aborts before anything lands on disk.

Release history

See CHANGELOG.md. Future work is driven by real-user feedback — open an issue if something pinches.

Design principles

Agent-agnostic. No hard dependency on any LLM vendor or client. MCP is the only integration point. Ollama is the default extractor; Anthropic/OpenAI are optional adapters.
Portable data. The graph is plain markdown + YAML frontmatter on disk. Readable in any editor, versionable in git, greppable from the shell.
Light runtime. ~75 MB RAM for the MCP server. The extractor is out-of-process and runs on your schedule, not on every request — see Resource footprint for the full cost breakdown across adapters.
Opt-in integrations. Client-specific helpers (hooks, config snippets) live in docs/integrations/ — you can use Litopys without any of them.