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Virtual Filesystem

io.github.lu-zhengda/virtual-fs · v0.2.2

PostgreSQL-backed virtual filesystem for agents: session isolation, shared stores, POSIX ops, RLS.

Website Source code Set it up

Connect Runs on your machine

Terminal
claude mcp add virtual-fs -e DATABASE_URL=<DATABASE_URL> -e VFS_AUTO_INIT=<VFS_AUTO_INIT> -e VFS_SESSION_ID=<VFS_SESSION_ID> -e VFS_ENABLE_RLS=<VFS_ENABLE_RLS> -- npx -y [email protected]
claude_desktop_config.json
{
  "mcpServers": {
    "virtual-fs": {
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "DATABASE_URL": "<DATABASE_URL>",
        "VFS_AUTO_INIT": "<VFS_AUTO_INIT>",
        "VFS_SESSION_ID": "<VFS_SESSION_ID>",
        "VFS_ENABLE_RLS": "<VFS_ENABLE_RLS>"
      }
    }
  }
}
~/.cursor/mcp.json
{
  "mcpServers": {
    "virtual-fs": {
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "DATABASE_URL": "<DATABASE_URL>",
        "VFS_AUTO_INIT": "<VFS_AUTO_INIT>",
        "VFS_SESSION_ID": "<VFS_SESSION_ID>",
        "VFS_ENABLE_RLS": "<VFS_ENABLE_RLS>"
      }
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "virtual-fs": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "DATABASE_URL": "<DATABASE_URL>",
        "VFS_AUTO_INIT": "<VFS_AUTO_INIT>",
        "VFS_SESSION_ID": "<VFS_SESSION_ID>",
        "VFS_ENABLE_RLS": "<VFS_ENABLE_RLS>"
      }
    }
  }
}

Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.

Tools

This server runs locally, so its tools are listed by your MCP client once it starts.

Environment variables

NameDescription
DATABASE_URL
Required, secret		PostgreSQL connection string (e.g. postgresql://user:pass@host:5432/dbname)
VFS_AUTO_INIT
Optional		Auto-create database tables on startup (set to 'true' for first run)
VFS_SESSION_ID
Optional		Deterministic session ID for resumable sessions across restarts
VFS_ENABLE_RLS
Optional		Enable PostgreSQL Row Level Security for database-enforced session isolation

Details

Package[email protected] (NPM, stdio)
First published11 Feb 2026
Last updated11 Feb 2026
Registry nameio.github.lu-zhengda/virtual-fs

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