LocalFree server, account needed

Nacre MCP server

nacre-work/nacre

Self-hosted permission-aware context layer. Search returns only what the caller may read.

2 GitHub stars
Source code Website

Install Nacre in Claude Code

Claude Code
claude mcp add nacre -e NACRE_SERVICE_KEY=... -- npx -y @nacre.work/mcp
mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)
{
  "mcpServers": {
    "nacre": {
      "command": "npx",
      "args": [
        "-y",
        "@nacre.work/mcp"
      ],
      "env": {
        "NACRE_SERVICE_KEY": "..."
      }
    }
  }
}

Replace each ... with your own value.

Frequently asked questions

What does the Nacre MCP server do?

Self-hosted permission-aware context layer. Search returns only what the caller may read.

Is the Nacre MCP server free?

The server is free, but you will likely need an account. The server itself is free, but it connects to a service that needs an account or API key, which may have paid tiers. Check the provider for current pricing.

Does Nacre run locally or remotely?

Local. Runs on your machine (stdio). You install it with npx, uvx, Docker or from source.

How do I add Nacre to Claude Code?

Run: claude mcp add nacre -e NACRE_SERVICE_KEY=... -- npx -y @nacre.work/mcp

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