mcp-nixos MCP — 使用场景, 安装 & 实时演示

为什么要用

核心特性

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

实时演示

实际使用效果

nixos.replay ▶ 就绪

0/0

安装

选择你的客户端

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

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

打开 Claude Desktop → Settings → Developer → Edit Config。保存后重启应用。

~/.cursor/mcp.json · .cursor/mcp.json

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

Cursor 使用与 Claude Desktop 相同的 mcpServers 格式。项目级配置优先于全局。

VS Code → Cline → MCP Servers → Edit

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

点击 Cline 侧栏中的 MCP Servers 图标，然后选 "Edit Configuration"。

~/.codeium/windsurf/mcp_config.json

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

格式与 Claude Desktop 相同。重启 Windsurf 生效。

~/.continue/config.json

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

Continue 使用服务器对象数组，而非映射。

~/.config/zed/settings.json

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

加入 context_servers。Zed 保存后热重载。

claude mcp add nixos -- uvx mcp-nixos

一行命令搞定。用 claude mcp list 验证，claude mcp remove 卸载。

使用场景

实战用法： mcp-nixos

Find a NixOS package by fuzzy name or purpose

👤 NixOS users, flake authors ⏱ ~5 min beginner

何时使用： You remember roughly what the package does but not its nix attribute name.

步骤

Search

Find NixOS packages matching 'ocr command line tool'.✓ 已复制

→ 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.✓ 已复制

→ Detail card with attr, versions, platforms

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

注意事项

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

搭配使用： filesystem

Look up a NixOS module option with its type and default

👤 People writing NixOS modules ⏱ ~5 min beginner

何时使用： You know there's an option 'somewhere' for enabling zswap and you don't want to grep nixpkgs.

步骤

Query options

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

→ Full option card
Get an example

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

→ Copy-paste Nix snippet

结果： 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

何时使用： A newer version broke something and you want the last known-good commit.

步骤

Find historical versions

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

→ Version→commit table
Generate a flake input

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

→ Ready-to-paste flake.nix snippet

结果： A reproducibly pinned input for rollback.

搭配使用： filesystem

Discover Home Manager options for a program

👤 Anyone using Home Manager ⏱ ~10 min beginner

何时使用： You want to manage a program declaratively but aren't sure what options exist.

步骤

List program options

List every Home Manager option under programs.neovim.✓ 已复制

→ Categorized option list
Build a minimal block

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

→ Working HM snippet

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

组合

与其他 MCP 搭配，撬动十倍杠杆

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.✓ 已复制

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.✓ 已复制

工具

此 MCP 暴露的能力

工具	输入参数	何时调用	成本
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

成本与限制

运行它的成本

API 配额: Public APIs; generous limits but not infinite — don't hammer
每次调用 Token 数: Options with descriptions: 500-2000 tokens. Lists can be larger.
费用: Free
提示: Prefer info on one package over search returning 50.

安全

权限、密钥、影响范围

凭据存储： None

数据出站： 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.

故障排查

常见错误与修复

uvx not found

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

验证： uvx --version

No results for a package I know exists

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

验证： Retry with partial keyword

Stale version info

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

替代方案

mcp-nixos 对比其他方案

替代方案	何时用它替代	权衡
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

mcp-nixos