Filesystem

Name: Filesystem
Author: fieldcure

by fieldcureversion 1.1.2i★ –iRuns on your computer

Registry nameio.github.fieldcure/filesystem

Install

Overview

Description from the maker (original English)

Secure MCP server for sandboxed filesystem operations with document parsing support.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Docs, sheets & office work

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
The registry lists no key to fill in.

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "filesystem": {
      "command": "dnx",
      "args": [
        "FieldCure.Mcp.Filesystem",
        "--yes"
      ]
    }
  }
}

Run this in your terminal

claude mcp add filesystem -- dnx FieldCure.Mcp.Filesystem --yes

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "filesystem": {
      "command": "dnx",
      "args": [
        "FieldCure.Mcp.Filesystem",
        "--yes"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "filesystem": {
      "type": "stdio",
      "command": "dnx",
      "args": [
        "FieldCure.Mcp.Filesystem",
        "--yes"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 6, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account fieldcure, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Docs, sheets & office worki

More stars than 0% of the other 2178 servers in this category
Published to the registry more recently than 11% of the other 2178 servers in this category
Basic checks equal to or better than 100% of the other 2178 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Filesystem safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (1.1.2) reached the registry 5 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need .NET on your computer.

What can I use instead?

In the same category: Agent-Native Calendar, Excel MCP Server, MCP Server for Excel

Alternatives

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Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

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Runs in the cloud★ 7,620MITUpdated 2 months ago

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Excel MCP Server

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Runs on your computer★ 4,276MITUpdated 6 days ago

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MCP Server for Excel

by sbroenne

Excel automation for AI - Sheets, Power Query, DAX, VBA, Tables, Ranges and more. Windows only.

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Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

FieldCure MCP Filesystem Server

A secure Model Context Protocol (MCP) server that exposes local filesystem operations to AI clients. Built with C# and the official MCP C# SDK.

Features

17 filesystem tools: read, write, append, delete, search, copy, move, convert-to-markdown, and more
Sandboxed access: all operations restricted to explicitly allowed directories
MCP roots protocol: clients can change allowed directories at runtime without restarting the server
Security hardened: path traversal prevention, symlink resolution, NTFS ADS blocking, Windows reserved name rejection
Atomic writes: temp-file-then-rename pattern prevents data corruption
Binary detection: automatically returns base64 for binary files, UTF-8 for text
Built-in document parsing: supported document formats can be read directly and converted to markdown on disk
Stdio transport: standard MCP subprocess model via JSON-RPC over stdin/stdout

Installation

dotnet tool

dotnet tool install -g FieldCure.Mcp.Filesystem

From source

git clone https://github.com/fieldcure/fieldcure-mcp-filesystem.git

cd fieldcure-mcp-filesystem dotnet build

Requirements

.NET 8.0 Runtime or later

Configuration

Claude Desktop

"mcpServers": { "filesystem": { "command": "fieldcure-mcp-filesystem", "args": [ "C:\\Users\\me\\Documents", "C:\\Projects" ] } } }

VS Code

"servers": { "filesystem": { "command": "fieldcure-mcp-filesystem", "args": [ "${workspaceFolder}" ] } } }

Tools

File Operations

Tool	Description
`read_file`	Read file contents (text as UTF-8, binary as base64)
`read_multiple_files`	Read multiple files at once with per-file error handling
`read_file_lines`	Read a specific range of lines
`convert_to_markdown`	Convert one supported document file into a markdown file on disk
`convert_directory_to_markdown`	Batch-convert supported document files in a directory to markdown files
`write_file`	Create or overwrite a file with atomic write
`append_file`	Append content to end of file with auto-newline
`modify_file`	Find and replace text (plain text or regex)
`copy_file`	Copy a file or directory recursively
`move_file`	Move or rename a file or directory
`delete_file`	Delete a file or directory

Directory Operations

Tool	Description
`list_directory`	List contents with type markers, sizes, and dates
`create_directory`	Create a directory recursively
`directory_tree`	Hierarchical tree view with configurable depth

Search & Info

Tool	Description
`search_files`	Find files by glob pattern
`search_within_files`	Search text content across files with line numbers
`get_file_info`	File or directory metadata

MCP Roots Protocol

The server supports the MCP roots protocol for runtime directory changes. When the client changes roots:

The server requests the updated roots list.
Allowed directories are replaced entirely.
CLI args provide the initial sandbox.
An empty roots list means all file access is denied.

Security Model

All paths are validated through IPathValidator before any filesystem operation:

Allowed directories define the sandbox boundary.
. and .. are normalized via Path.GetFullPath().
Symlinks must resolve within allowed directories.
Prefix matching is directory-separator-aware.
NTFS alternate data streams are blocked.
Windows reserved names are rejected.
Allowed directory updates are thread-safe.

The markdown conversion tools validate both source and output paths through the same sandbox rules. They write converted markdown directly to disk instead of returning full document text through MCP, which is usually more token-efficient than read_file plus write_file.

Project Structure

src/FieldCure.Mcp.Filesystem/

Development

dotnet build

dotnet test dotnet pack src/FieldCure.Mcp.Filesystem -c Release

Limitations

Supported	Not Yet Supported
Text file read/write (UTF-8)	Non-UTF-8 encoding auto-detection
Binary file detection + base64	Streaming for very large files (>100 MB)
Atomic writes	File watching / change notifications
Glob pattern search	Full-text indexing
Regex find-and-replace	Multi-file transactional writes
Symlink resolution	Cross-platform symlink creation
MCP roots protocol	HTTP transport
Document text extraction / markdown conversion for formats supported by DocumentParsers	OCR for scanned documents

License

MIT

Filesystem

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Docs, sheets & office worki

Common questions

Alternatives

Agent-Native Calendar

Excel MCP Server

MCP Server for Excel

README from the maker

FieldCure MCP Filesystem Server

Features

Installation

dotnet tool

From source

Requirements

Configuration

Claude Desktop

VS Code

Tools

File Operations

Directory Operations

Search & Info

MCP Roots Protocol

Security Model

Project Structure

Development

Limitations

See Also

License