Modrinth MCP

Name: Modrinth MCP
Author: justinscott12

by justinscott12version 0.1.3i★ –iRuns on your computer

Registry nameio.github.justinscott12/modrinth-mcp

Install

Overview

Description from the maker (original English)

Search Modrinth and publish Minecraft mods (create projects, upload versions) via the Modrinth API.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiVery new↓ 331/wk · ★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Search & AI memory
You need to fill in: MODRINTH_TOKEN

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
You fill in yourself: MODRINTH_TOKEN

Values marked secret are keys to your account. Never share them or paste them into a chat.

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "modrinth": {
      "command": "npx",
      "args": [
        "-y",
        "@justinscott12/modrinth-mcp"
      ],
      "env": {
        "MODRINTH_TOKEN": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add modrinth --env MODRINTH_TOKEN=your-value -- npx -y @justinscott12/modrinth-mcp

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "modrinth": {
      "command": "npx",
      "args": [
        "-y",
        "@justinscott12/modrinth-mcp"
      ],
      "env": {
        "MODRINTH_TOKEN": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "modrinth": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@justinscott12/modrinth-mcp"
      ],
      "env": {
        "MODRINTH_TOKEN": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

Values you fill in

MODRINTH_TOKEN secret env
Modrinth Personal Access Token (https://modrinth.com/settings/pats). Required only for write actions; read-only tools work without it.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 9, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account justinscott12, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Search & AI memoryi

More stars than 0% of the other 5755 servers in this category
Published to the registry more recently than 86% of the other 5755 servers in this category
Basic checks equal to or better than 100% of the other 5755 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Modrinth MCP safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

You need to fill in: MODRINTH_TOKEN

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.1.3) reached the registry 6 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: Context7, Codebase Memory, Exa

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:↓ Downloads per weeki★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

Context7

Feeds AI the latest docs for libraries and frameworks before it answers, so code it writes does not use outdated, removed functions.

by upstashWidely used↓ 972.7K/wk★ 64.2KUpdated 3 days ago

Computer or cloud

Install

Codebase Memory

Codebase knowledge graph for AI agents — 162 languages, sub-ms queries, 99% fewer tokens.

by DeusDataWidely used↓ 18K/wk★ 48.1KUpdated 23 days ago

Runs on your computer

Install

Exa

Connect AI agents to Exa for web search, content fetching, and multi-step research.

by exa-labsWidely used★ 5.2KUpdated 2 months ago

Runs in the cloud✓ exa.ai

Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

modrinth-mcp

An MCP server that wraps the Modrinth API so an AI agent (Claude Code, Claude Desktop, Cursor, …) can search projects, read project/version metadata, and publish Minecraft mods — create projects and upload built jars as new versions.

Tools

Tool	Auth	What it does
`modrinth_whoami`	✅	Verify your token; return the authenticated user.
`modrinth_search_projects`	–	Search public Modrinth projects.
`modrinth_get_project`	–	Get a project's metadata by slug or id.
`modrinth_list_project_versions`	–	List a project's published versions.
`modrinth_create_version`	✅	Publish a new version by uploading one or more jars.
`modrinth_create_project`	✅	Create a new project (as a draft).
`modrinth_modify_version`	✅	Edit metadata of an existing version.

Read-only tools work without a token. Anything that writes needs a Modrinth Personal Access Token.

Getting a token

Create a PAT at https://modrinth.com/settings/pats with these scopes:

Read projects
Read versions
Create versions
Write versions

Set it as the MODRINTH_TOKEN environment variable.

Install

As a Claude Code plugin

/plugin marketplace add justinscott12/modrinth-mcp

/plugin install modrinth-mcp@justinscott12

It runs the published npm package under the hood via npx. Claude Code plugins have no token-entry UI, so the server reads its token from the MODRINTH_TOKEN environment variable in the environment Claude Code runs in. Set it before launching Claude Code, e.g.:

# macOS/Linux (add to your shell profile to persist)

export MODRINTH_TOKEN=your-modrinth-pat

Windows PowerShell (persist for your user)

setx MODRINTH_TOKEN "your-modrinth-pat"

Then restart Claude Code and run modrinth_whoami to confirm. Read-only tools (search, get project/versions) work without a token.

As an MCP server (any client)

Add to your MCP client config (e.g. Claude Desktop claude_desktop_config.json):

"mcpServers": { "modrinth": { "command": "npx", "args": ["-y", "@justinscott12/modrinth-mcp"], "env": { "MODRINTH_TOKEN": "your-modrinth-pat" } } } }

Or in Claude Code directly:

claude mcp add modrinth --env MODRINTH_TOKEN=your-modrinth-pat -- npx -y @justinscott12/modrinth-mcp

Environment variables

Variable	Default	Purpose
`MODRINTH_TOKEN`	–	Modrinth Personal Access Token. Required for write actions.
`MODRINTH_STAGING`	unset	Set to `1` to hit `https://staging-api.modrinth.com` for safe testing.
`MODRINTH_USER_AGENT`	`modrinth-mcp/ …`	Override the User-Agent sent to Modrinth.
`MODRINTH_TIMEOUT_MS`	`60000`	Per-request timeout. A stalled request returns a tool error instead of hanging.
`MODRINTH_API_URL`	–	Override the API base URL (for a proxy or tests). Takes precedence over `MODRINTH_STAGING`.

Example flow

modrinth_whoami — confirm auth works.
modrinth_create_project — create the project page (created as a draft).
modrinth_create_version — upload your built jar(s) with the target game_versions and loaders.
Submit the project for review on the Modrinth site when ready.

Note: create_version and create_project publish public content. Only call them when you actually intend to publish.

Development

npm install

MODRINTH_STAGING=1 MODRINTH_TOKEN=your-staging-pat npm start

The server speaks MCP over stdio. stdout is reserved for the protocol; logs go to stderr.

npm test runs the server over stdio against a local stub (no Modrinth calls).

The server ignores SIGINT/SIGBREAK and exits when the client closes stdin. A console Ctrl+C or Ctrl+Break reaches every process on the console, and on Windows npx runs the server through a .cmd shim: if node exited, cmd.exe would keep the pipe open at a Terminate batch job (Y/N)? prompt and every later tool call would hang. Node can't simulate that on Windows, so check it by hand there: send GenerateConsoleCtrlEvent to a shim-launched server and confirm tools/list still answers.

License

MIT

Modrinth MCP

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Search & AI memoryi

Common questions

Alternatives

Context7

Codebase Memory

Exa

README from the maker

modrinth-mcp

Tools

Getting a token

Install

As a Claude Code plugin

Windows PowerShell (persist for your user)

As an MCP server (any client)

Environment variables

Example flow

Development

License