Virtual Filesystem MCP Server

by lu-zhengdaio.github.lu-zhengda/virtual-fsv0.2.2

MCP server providing AI agents with persistent, PostgreSQL-backed virtual filesystem — session-isolated file operations, cross-session stores, glob/grep search, and Row Level Security

3Node.jsstdioofficial registry

context tax

queued

security

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cold start

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freshness

Stale8mo ago

Install Virtual Filesystem MCP server

claude mcp add virtual-fs -e DATABASE_URL='<database-url>' -- npx -y mcp-virtual-fs

{
  "mcpServers": {
    "virtual-fs": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-virtual-fs"
      ],
      "env": {
        "DATABASE_URL": "<database-url>"
      }
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (project).

{
  "mcpServers": {
    "virtual-fs": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-virtual-fs"
      ],
      "env": {
        "DATABASE_URL": "<database-url>"
      }
    }
  }
}

Settings → Developer → Edit Config (claude_desktop_config.json), then restart.

{
  "servers": {
    "virtual-fs": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "mcp-virtual-fs"
      ],
      "env": {
        "DATABASE_URL": "<database-url>"
      }
    }
  }
}

Add to .vscode/mcp.json in your workspace.

{
  "mcpServers": {
    "virtual-fs": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-virtual-fs"
      ],
      "env": {
        "DATABASE_URL": "<database-url>"
      }
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json.

Configuration

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

Freshness

Stale — last maintenance signal 8mo ago. The newest of the signals below sets the band.

Last commit (default branch)
2026-02-16 · 8mo ago · GitHub
Latest release
2026-02-11 · 8mo ago · GitHub · v0.2.2
Package published
no data · npm/PyPI
Registry entry updated
2026-02-11 · 8mo ago · official registry · v0.2.2

FAQ

›How do I install the Virtual Filesystem MCP server in Claude Code?

Run: claude mcp add virtual-fs -e DATABASE_URL='<database-url>' -- npx -y mcp-virtual-fs. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.

›Does Virtual Filesystem require an API key?

Yes. It expects DATABASE_URL, of which 1 is a secret.

›Can I use Virtual Filesystem as a remote (hosted) MCP server?

No hosted endpoint is published; it runs locally over stdio.

›Is Virtual Filesystem in the official MCP registry?

Yes, as io.github.lu-zhengda/virtual-fs.