Savecraft

Savecraft gives Claude, ChatGPT, and Gemini real game data via MCP on every supported game (Magic, Path of Exile, Factorio, RimWorld, Stellaris, Diablo II, and more): rules, items, builds, economy. For save-file games, it also parses your saves into structured data so your AI sees your actual characters, gear, and run progress.

Quick Start

1. Connect your AI

ChatGPT: install the Savecraft app — one click from the OpenAI app directory.

Claude: sign in at my.savecraft.gg to get your MCP connector URL, then add it to Claude's connector settings.

Your AI immediately gets expert modules for every supported game: rules, items, builds, economy data.

2. (Optional) Install the daemon

For save-integration games (Diablo II, RimWorld, Factorio, Stellaris, Stardew Valley, etc.), install the daemon to let your AI read your live save state: characters, gear, decks, farms.

Linux / Steam Deck:

curl -sSL https://install.savecraft.gg | bash

Windows / Mac: download from install.savecraft.gg

The daemon auto-detects supported games and starts syncing. Ask your AI about your character, your build, or your last run -- it already has the data.

How It Works

  ┌─────────────────────┐            ┌───────────────────────────┐
  │  Gaming Device      │   HTTPS    │  Cloudflare               │
  │                     │  ───────>  │                           │
  │  savecraftd         │   push     │  Push API ──> R2 Storage  │
  │  - fs watcher       │            │                           │
  │  - WASM plugin      │  <──────>  │  SourceHub DO (WebSocket) │
  │    runtime (wazero) │    WS      │                           │
  └─────────────────────┘            │  MCP Server ──> AI Tools  │
                                     └───────────────────────────┘
  ┌─────────────────────┐                       │
  │  Claude / ChatGPT / │   <──── MCP ──────────┘
  │  Gemini             │
  └─────────────────────┘

1. Daemon watches your save files. Detects changes via fsnotify with debounce + hash dedup.
2. WASM plugins parse saves into structured JSON. Sandboxed via wazero - plugins can't touch your filesystem or network. Ed25519 signed.
3. AI reads your state through MCP tools. Section-level granularity - the AI fetches only what it needs to answer your question.

MCP Tools

Supported Games

Plugins are sandboxed WASM binaries that parse save files. They read raw bytes on stdin, emit structured JSON on stdout, and cannot access your filesystem or network. Each plugin is Ed25519 signed and verified before loading. Plugins can optionally ship a reference.wasm for server-side computation: drop calculators, gift databases, crop planners - deployed via Workers for Platforms.

See docs/games.md for detailed descriptions of each game's sections and reference modules.

Planned save-file parsers: Victoria 3 (Clausewitz/Rust), CK3/HOI4 (Clausewitz), Baldur's Gate 3 (.lsv), Elden Ring (.sl2), Civilization VI, Bethesda games (.ess)

Planned API adapters (no daemon required): Path of Exile 2 (GGG API), FFXIV

Planned mod integrations: Minecraft, Terraria (mod-as-device: mod pushes directly, no daemon)

Want to add a game? See the plugin development guide.

Project Structure

savecraft.gg/
├── cmd/savecraftd/       # Daemon entrypoint
├── internal/
│   ├── daemon/           # Orchestrator, domain types, interfaces
│   ├── runner/           # WASM plugin execution (wazero)
│   ├── watcher/          # Filesystem watcher (fsnotify + debounce)
│   ├── wsconn/           # WebSocket client (reconnecting)
│   ├── pluginmgr/        # Plugin download, verification, caching
│   ├── selfupdate/       # Daemon self-update mechanism
│   └── signing/          # Ed25519 plugin signature verification
├── worker/               # Cloudflare Worker + Durable Object (TypeScript)
├── reference/            # Reference Worker - WASI shim for server-side plugin computation (WfP)
├── web/                  # SvelteKit frontend
├── plugins/              # WASM plugin sources (parser + optional reference per game)
├── proto/                # Protobuf protocol definitions
├── install/              # Platform installers + systemd units
├── assets/               # Brand assets
└── docs/                 # Architecture docs

Development

Requires nix devenv + direnv. direnv allow activates the environment on cd.

just --list          # Show all targets
just test            # Run all tests (Go + Worker)
just check           # Lint, generate, test everything
just proto           # Regenerate Go + TypeScript from protobuf
just dev-worker      # Start Worker dev server (Miniflare)

See docs/overview.md for the system architecture, or browse docs/ for component-specific documentation.

Tech Stack

Security

• WASM sandboxed: Plugins cannot access filesystem, network, or environment. stdin in, JSON out.
• Ed25519 signed: Every plugin binary is cryptographically signed. Tampered = refused.
• Read-only daemon: Cannot modify your saves. Kernel-enforced on Linux via systemd sandboxing.
• No filesystem exposure: AI sees structured JSON, never your local paths or files.
• Private R2: No public bucket access. The Worker mediates all reads/writes, scoped to the authenticated user.

License

Apache License 2.0