Savecraft

Real game data for your AI assistant, on every supported game.

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, the moment you add a game. Add a game and Savecraft connects it the right way for that game -- you never pick the plumbing. Account games (Path of Exile, World of Warcraft) connect through the game's own read-only sign-in. Save-file games are parsed by a local daemon on the machine you play on, so your AI sees your actual characters, gear, and run progress.

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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.

2. Add a game

At my.savecraft.gg you add a game; Savecraft connects it the way that game works. There is one verb -- add a game -- and no install to start.

• Reference is instant. Every supported game answers rules, items, builds, and economy questions the moment it's added: no account, no install, no saves.

• Account games (Path of Exile -- a GGG-approved connection -- and World of Warcraft) sign in through the game's own provider, read-only. Your AI reads your live characters with nothing installed.

• Save-file games (Diablo II, RimWorld, Stellaris, Stardew Valley, and more) are read by the Savecraft daemon on the machine you play on. The save files never leave your device -- only parsed state is sent. Install it where you play:

  Linux / Steam Deck:

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

  Windows / Mac: download from install.savecraft.gg

  It auto-detects supported games and starts syncing. Then ask your AI about your character, your build, or your last run -- it already has the data.

• Moddable games (Factorio) push state from a Savecraft mod instead; adding the game points you to it.

How It Works

Reference data is served straight from the cloud, and account games reach it through the game's server-side OAuth -- neither needs anything on your machine. The diagram below is the save-file path: how a local game's saves become structured data your AI can read.

  ┌─────────────────────┐            ┌───────────────────────────┐
  │  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

Tool	Description
list_games	All games with saves, note titles, and reference modules with parameter schemas
get_save	Summary, overview, sections, and notes for a save
get_section	Section data from D1
refresh_save	Request fresh data (daemon-backed or API-backed)
search_saves	Full-text search across all saves and notes
get_note	Full content of a user-attached note
create_note / update_note / delete_note	Manage notes via AI conversation
query_reference	Execute reference data computations (drop rates, build math)

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.

Game	Format	Reference Modules	Status	Author
Clair Obscur: Expedition 33	Save file (WASM)	--	Beta	@joshsymonds
Diablo II: Resurrected	.d2s / .d2i binary	Drop Calculator	Beta	@joshsymonds
Factorio	Factorio Mod Portal + WASM	Recipe Lookup, Ratio Calculator, Oil Balancer, Tech Tree, Blueprint Analyzer, Evolution Tracker, Power Calculator, Production Flow	Alpha	@joshsymonds
Magic: The Gathering Arena	Player.log	Card Search, Rules Search, Draft Advisor, Play Advisor, Card Stats, Deckbuilding, Collection Diff, Match Stats, Sideboard Analysis, Mana Base	Beta	@joshsymonds
Path of Exile	GGG account (approved app) or pobb.in/pastebin URL	Build Planner (headless Path of Building), Gem Search, Passive Tree Search, Unique Search, Mod Search, Economy Prices	Beta	@joshsymonds
RimWorld	Steam Workshop mod	Surgery Calculator, Crop Optimizer, Combat Calculator, Material Lookup, Drug Analyzer, Raid Estimator, Gene Builder, Research Navigator	Beta	@joshsymonds
Stardew Valley	XML save directory	Gift Preferences, Crop Planner	Beta	@joshsymonds
Stellaris	Steam Workshop + .sav (Clausewitz/Rust)	Tech Search, Tech Path, Building Search, Component Search, Tradition Search, Trait Search, Civic Search, Edict Search, Job Search	Alpha	@joshsymonds
World of Warcraft	Battle.net API	--	Beta	@joshsymonds

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

Component	Technology
Daemon	Go, wazero (WASM runtime), fsnotify, nhooyr.io/websocket
Cloud	Cloudflare Workers, Durable Objects, R2, D1 (SQLite/FTS5)
Auth	Clerk (OAuth, JWT, magic links)
Frontend	SvelteKit, TypeScript
Plugins	Go or Rust compiled to WASI Preview 1, ndjson stdout contract
Protocol	Protobuf (buf codegen to Go + TypeScript)
Build	just, nix devenv + direnv

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

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