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Search Modrinth and publish Minecraft mods (create projects, upload versions) via the Modrinth API.
About
Search Modrinth and publish Minecraft mods (create projects, upload versions) via the Modrinth API.
Security Report
This MCP server implements proper authentication for write operations and reads the token securely from environment variables. However, there are notable security concerns: the token is transmitted as plaintext in the Authorization header without Bearer prefix (non-standard), file paths are read from user input without validation enabling potential path traversal, and sensitive file I/O operations lack comprehensive error handling and logging safeguards. Supply chain analysis found 1 known vulnerability in dependencies (0 critical, 1 high severity). Package verification found 1 issue.
3 files analyzed · 8 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
What You'll Need
Set these up before or after installing:
Environment variable: MODRINTH_TOKEN
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-justinscott12-modrinth-mcp": {
"env": {
"MODRINTH_TOKEN": "your-modrinth-token-here"
},
"args": [
"-y",
"@justinscott12/modrinth-mcp"
],
"command": "npx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
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/<version> … | Override the User-Agent sent to Modrinth. |
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 targetgame_versionsandloaders.- Submit the project for review on the Modrinth site when ready.
Note:
create_versionandcreate_projectpublish 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.
License
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