mcp-nixos MCP — Cas d'usage, Installer & Démo en direct

Pourquoi l'utiliser

Fonctionnalités clés

130k+ NixOS packages + 23k+ system options queryable
Covers Home Manager (5k+ options), nix-darwin (1k+ macOS settings), Nixvim, FlakeHub, Noogle
nix_versions tool for historical versions + pinned nixpkgs commit hashes
No auth required — public API queries only
Runs via uvx, Nix flake, or Docker

Démo en direct

Aperçu en pratique

nixos.replay ▶ prêt

0/0

Installer

Choisissez votre client

~/Library/Application Support/Claude/claude_desktop_config.json · Windows: %APPDATA%\Claude\claude_desktop_config.json

{
  "mcpServers": {
    "nixos": {
      "command": "uvx",
      "args": [
        "mcp-nixos"
      ],
      "_inferred": true
    }
  }
}

Ouvrez Claude Desktop → Settings → Developer → Edit Config. Redémarrez après avoir enregistré.

~/.cursor/mcp.json · .cursor/mcp.json

{
  "mcpServers": {
    "nixos": {
      "command": "uvx",
      "args": [
        "mcp-nixos"
      ],
      "_inferred": true
    }
  }
}

Cursor utilise le même schéma mcpServers que Claude Desktop. La config projet l'emporte sur la globale.

VS Code → Cline → MCP Servers → Edit

{
  "mcpServers": {
    "nixos": {
      "command": "uvx",
      "args": [
        "mcp-nixos"
      ],
      "_inferred": true
    }
  }
}

Cliquez sur l'icône MCP Servers dans la barre latérale Cline, puis "Edit Configuration".

~/.codeium/windsurf/mcp_config.json

{
  "mcpServers": {
    "nixos": {
      "command": "uvx",
      "args": [
        "mcp-nixos"
      ],
      "_inferred": true
    }
  }
}

Même format que Claude Desktop. Redémarrez Windsurf pour appliquer.

~/.continue/config.json

{
  "mcpServers": [
    {
      "name": "nixos",
      "command": "uvx",
      "args": [
        "mcp-nixos"
      ]
    }
  ]
}

Continue utilise un tableau d'objets serveur plutôt qu'une map.

~/.config/zed/settings.json

{
  "context_servers": {
    "nixos": {
      "command": {
        "path": "uvx",
        "args": [
          "mcp-nixos"
        ]
      }
    }
  }
}

Ajoutez dans context_servers. Zed recharge à chaud à la sauvegarde.

claude mcp add nixos -- uvx mcp-nixos

Une seule ligne. Vérifiez avec claude mcp list. Supprimez avec claude mcp remove.

Cas d'usage

Usages concrets : mcp-nixos

Find a NixOS package by fuzzy name or purpose

👤 NixOS users, flake authors ⏱ ~5 min beginner

Quand l'utiliser : You remember roughly what the package does but not its nix attribute name.

Déroulement

Search

Find NixOS packages matching 'ocr command line tool'.✓ Copié

→ Ranked list of candidates with descriptions
Get details on the best fit

For tesseract, show me the attribute path, version in unstable vs 24.11, and which meta.platforms are supported.✓ Copié

→ Detail card with attr, versions, platforms

Résultat : The exact attribute to drop into your configuration.nix or flake.

Pièges

Channel mismatch — package only exists in unstable, not your stable channel — Ask explicitly about the channel you're on

Combiner avec : filesystem

Look up a NixOS module option with its type and default

👤 People writing NixOS modules ⏱ ~5 min beginner

Quand l'utiliser : You know there's an option 'somewhere' for enabling zswap and you don't want to grep nixpkgs.

Déroulement

Query options

Is there a NixOS option for enabling zswap? Show its type, default, and description.✓ Copié

→ Full option card
Get an example

Give me a minimal configuration.nix snippet that enables zswap with z3fold and 20% memory.✓ Copié

→ Copy-paste Nix snippet

Résultat : A correct option usage ready to paste in.

Pin nixpkgs to an old version of a package

👤 Users needing a specific older version ⏱ ~10 min intermediate

Quand l'utiliser : A newer version broke something and you want the last known-good commit.

Déroulement

Find historical versions

Show me past versions of nodejs_20 in nixpkgs with commit hashes.✓ Copié

→ Version→commit table
Generate a flake input

Generate the flake input pinning nodejs_20 20.15.0 from that commit.✓ Copié

→ Ready-to-paste flake.nix snippet

Résultat : A reproducibly pinned input for rollback.

Combiner avec : filesystem

Discover Home Manager options for a program

👤 Anyone using Home Manager ⏱ ~10 min beginner

Quand l'utiliser : You want to manage a program declaratively but aren't sure what options exist.

Déroulement

List program options

List every Home Manager option under programs.neovim.✓ Copié

→ Categorized option list
Build a minimal block

Give me a minimal programs.neovim block enabling Telescope and LSP for TS/Python.✓ Copié

→ Working HM snippet

Résultat : A working Home Manager config without reading the full manual.

Combinaisons

Associez-le à d'autres MCPs pour un effet X10

nixos + filesystem

Find the option and write it into your config file

Find the NixOS option to enable flatpak, then add it to ~/nixos/configuration.nix with a comment.✓ Copié

nixos + github

Raise an issue when a package is missing

Is package foo-cli in nixpkgs? If not, open a github issue on our fork requesting it.✓ Copié

Outils

Ce que ce MCP expose

Outil	Entrées	Quand appeler	Coût
nix	action: search\|info\|stats\|options\|channels\|flake-inputs\|cache, args: ...	Any query over packages, options, channels	1 upstream API call
nix_versions	package: str	Need an older version / nixpkgs pin	1 upstream call

Coût et limites

Coût d'exécution

Quota d'API: Public APIs; generous limits but not infinite — don't hammer
Tokens par appel: Options with descriptions: 500-2000 tokens. Lists can be larger.
Monétaire: Free
Astuce: Prefer info on one package over search returning 50.

Sécurité

Permissions, secrets, portée

Stockage des identifiants : None

Sortie de données : Calls to search.nixos.org and related public APIs

Results reflect whatever upstream NixOS search returns — re-verify against your channel.
mcp-nixos does not run Nix; it does not execute any derivation.

Dépannage

Erreurs courantes et correctifs

uvx not found

Install uv: curl -LsSf https://astral.sh/uv/install.sh | sh, then re-add the MCP.

Vérifier : uvx --version

No results for a package I know exists

Spelling varies in attribute names — try a looser query or search by description.

Vérifier : Retry with partial keyword

Stale version info

The MCP caches briefly; re-query in 5 minutes or pass action=cache to refresh.

Alternatives

mcp-nixos vs autres

Alternative	Quand l'utiliser	Compromis
search.nixos.org directly	You're fine with a browser tab	No AI in the loop
nix-search CLI	You want local fast search and have Nix installed	Needs local Nix + an up-to-date channel

Plus

Ressources

📖 Lire le README officiel sur GitHub

🐙 Voir les issues ouvertes

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