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io.github.packwarden-dev/packwarden

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Thunderstore mod search, dependency checks and r2modman export. Not affiliated with Thunderstore.

Source code Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

NPM package @packwarden-dev/thunderstore-mcp
Claude Code 
claude mcp add packwarden -- npx -y @packwarden-dev/thunderstore-mcp@0.1.0
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "packwarden": {
            "command": "npx",
            "args": [
                "-y",
                "@packwarden-dev/thunderstore-mcp@0.1.0"
            ]
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. PackWarden — Thunderstore Mod-Pack MCP Server (v0.1.0)
  2. Tools
  3. Install
  4. Configuration (env)
  5. Be a good API citizen
  6. Tests (live API)
  7. Limitations

PackWarden — Thunderstore Mod-Pack MCP Server (v0.1.0)

PackWarden is not affiliated with or endorsed by Thunderstore. "Thunderstore" is used only to describe compatibility. Mod data comes from the public Thunderstore API (https://thunderstore.io).

An MCP server that helps AI assistants build and maintain Thunderstore mod packs (Lethal Company, Risk of Rain 2, Valheim, and every other Thunderstore community).

Tools

ToolWhat it does
list_communitiesList Thunderstore game communities (identifier + name).
search_modsSearch a community by name/owner/description/category; sort by relevance, downloads, rating, updated.
resolve_dependenciesFull transitive dependency closure for one or more packages/versions; final install set, missing deps, multi-version pins, optional tree.
check_pack_healthAudit a mod list: not found, removed version, deprecated, outdated, missing deps, dependency version conflicts, duplicates, NSFW.
export_r2modman_profileWrite an .r2z profile (r2modman / Thunderstore Mod Manager "Import profile → From file"), optionally with deps and config files. Nothing is uploaded.

Mods are referenced as Owner-Name (latest) or Owner-Name-1.2.3.

Install

Requires Node.js ≥ 18.17.

git clone <repo> thunderstore-mcp && cd thunderstore-mcp
npm install && npm run build
Claude Desktop

Edit claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\):

{
  "mcpServers": {
    "thunderstore": {
      "command": "node",
      "args": ["/absolute/path/to/thunderstore-mcp/dist/main.js"],
      "env": { "TSMCP_EXPORT_DIR": "/absolute/path/for/profiles" }
    }
  }
}

Restart Claude Desktop.

Cursor

~/.cursor/mcp.json (global) or .cursor/mcp.json (project):

{
  "mcpServers": {
    "thunderstore": {
      "command": "node",
      "args": ["/absolute/path/to/thunderstore-mcp/dist/main.js"]
    }
  }
}
Streamable HTTP (remote / self-hosted)
npm run start:http            # http://127.0.0.1:3333/mcp
PORT=8080 HOST=0.0.0.0 node dist/main.js --http

Cursor: { "mcpServers": { "thunderstore": { "url": "http://127.0.0.1:3333/mcp" } } }. The HTTP mode is stateless (POST-only, JSON responses) and has no auth. Put it behind a reverse proxy with TLS and auth before exposing it.

Configuration (env)

VarDefaultMeaning
TSMCP_CACHE_DIR~/.cache/thunderstore-mcpSlim package-index cache
TSMCP_LIST_TTL_MS3600000 (1h)Package-list freshness
TSMCP_MIN_INTERVAL_MS1000Minimum gap between outbound requests
TSMCP_EXPORT_DIR./exportsWhere .r2z files are written
TSMCP_CONTACTsupport@packwarden.devContact put in the User-Agent. Override if you run your own copy.
TSMCP_BRANDPackWardenBrand in server name/User-Agent
TSMCP_BASE_URLhttps://thunderstore.ioAPI base

Be a good API citizen

  • One full package list download per community per TTL, then conditional requests (If-Modified-Since). Results are cached on disk as a slim index.
  • Outbound requests are serialized (concurrency 1) and spaced ≥1s apart. On 429/5xx the client backs off and honours Retry-After.
  • Identifying User-Agent with a contact address.
  • If the network fails, the server keeps serving stale cache.

Tests (live API)

npm test                         # default community: valheim
TEST_COMMUNITY=valheim npm test

Tests cover stdio and streamable HTTP end-to-end against the live Thunderstore API.

Limitations

  • Large communities are heavy. The first load of Lethal Company is about 330 MB of JSON, takes about 14 s, and uses about 1.4 GB of RAM. After that, loads from cache take about 3 s.
  • Resolution follows r2modman behaviour (highest requested version wins). It does not do semver range solving, because Thunderstore pins exact versions.
  • No profile code sharing, which would need an upload to Thunderstore. Only file export is supported.
  • Search is local keyword scoring, not Thunderstore's own search ranking.

Frequently asked questions

What is io.github.packwarden-dev/packwarden?

Thunderstore mod search, dependency checks and r2modman export. Not affiliated with Thunderstore.

How do I install io.github.packwarden-dev/packwarden?

It runs on your machine. In Claude Code: claude mcp add packwarden -- npx -y @packwarden-dev/thunderstore-mcp@0.1.0. For other clients, paste the JSON configuration from this page into their MCP settings.

Does io.github.packwarden-dev/packwarden need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is io.github.packwarden-dev/packwarden open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains io.github.packwarden-dev/packwarden?

It is published by packwarden-dev. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.