nexus-mcp
A local MCP server for Nexus Mods mod discovery and research, backed by the v2 GraphQL API, enabling search of games, mods, collections, and users.
README
nexus-mcp
A local MCP server for Nexus Mods mod discovery and
research, backed by the v2 GraphQL API (api.nexusmods.com/v2/graphql).
Read-only by design.
Tools
| Tool | Purpose |
|---|---|
search_games |
Resolve game titles to domain names; browse most-modded games |
search_mods |
Search mods by name/game/author/tag, sorted by endorsements etc. |
get_mod |
Full mod details: description, requirements, tags, stats |
get_mod_files |
A mod's downloadable files with versions and changelogs |
search_collections |
Search curated mod lists |
get_collection |
Collection metadata + full mod list (by slug, optional revision) |
get_user |
User profile + their most-endorsed mods |
run_graphql |
Escape hatch: any read-only GraphQL query (mutations rejected) |
Adult content is always included — there is no filtering toggle.
Setup
npm install
npm run build
Register with Claude Code:
claude mcp add nexus-mods -e NEXUS_MODS_API_KEY=<your key> -- node /home/matthew/src/nexus-mcp/dist/index.js
Or in Claude Desktop's claude_desktop_config.json:
{
"mcpServers": {
"nexus-mods": {
"command": "node",
"args": ["/home/matthew/src/nexus-mcp/dist/index.js"],
"env": { "NEXUS_MODS_API_KEY": "<your key>" }
}
}
}
Authentication
NEXUS_MODS_API_KEY is optional — every tool works anonymously. When set
(a personal API key), it is
sent as the apikey header and unlocks viewer-relative fields
(viewerEndorsed, viewerTracked, viewerDownloaded) on get_mod.
See docs/adr/0001-personal-api-key-auth.md for why this server skips OAuth.
Development
npm run dev # run from source via tsx
node scripts/smoke.mjs # end-to-end smoke test against the live API (needs build)
Domain terminology lives in CONTEXT.md.
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