# Filesystem Sandbox Boundary Enforcer MCP for AI Agents MCP

> Filesystem Sandbox Boundary Enforcer MCP prevents path traversal attacks and unauthorized file access. It acts as a security layer for your AI agent, ensuring that any file system requests stay within strictly defined boundaries by resolving complex paths and auditing directory integrity.

## Overview
- **Category:** security
- **Price:** Free
- **Endpoint:** https://edge.vinkius.com/vk_preview_WuAO9mSf3KMorMN8oyA5O0AAZzSr5E7tzohiykdL/mcp
- **Tags:** sandbox, path-traversal, security-enforcement, path-normalization, access-control

## Description

Filesystem Sandbox Boundary Enforcer acts as a security gatekeeper for your local environment. When you give an AI agent access to your files, you are essentially handing it the keys to your machine. A single clever prompt can trick a standard setup into reading sensitive configuration files or system passwords using simple path traversal tricks. This MCP sits between your agent and your filesystem, intercepting every request to see where it is actually headed after all those messy segments and extra slashes are resolved. You can define specific allowed roots, and the tool will block anything that tries to wander outside those bounds. Whether you are running automated scripts or a chat interface, this adds a critical layer of defense. It is part of the Vinkius catalog, making it easy to plug into your existing workflow without rewriting your entire security architecture. You get to see exactly how paths will be expanded before they are even validated, so there is no guesswork involved in your security policies.

## Tools

### analyze_root_integrity
Audits your allowed directories to ensure no forbidden zones are accidentally included in your configuration.

### preview_path_expansion
Shows how a messy or complex path will be cleaned and resolved before any permission checks occur.

### validate_path_access
Checks if a specific file system request is safe and permitted under your current security policies.

## Prompt Examples

**Prompt:** 
```
Is this path safe to use in my allowed folder?
```

**Response:** 
```
| Input Path | Resolved Path | Status |
| :--- | :--- | :--- |
| `/var/www/html/../etc/passwd` | `/etc/passwd` | **BLOCKED** (Violation) |
| `/home/user/docs/./report.pdf` | `/home/launcher/docs/report.pdf` | **ALLOWED** |
```

**Prompt:** 
```
Show me what happens to this messy path string.
```

**Response:** 
```
The path will be cleaned and normalized as follows:

*   **Original:** `///home//user/./docs/../config` 
*   **Resolved:** `/home/user/config` 

All redundant slashes and relative segments have been removed.
```

**Prompt:** 
```
Check if I accidentally included a dangerous directory in my config.
```

**Response:** 
```
**Audit Result for Root List:**

*   `/mnt/data`: **SAFE**
*   `/var/log/app`: **SAFE**
*   `/etc`: **WARNING** (Forbidden zone detected in configuration)
```

## Capabilities

### Block path traversal attacks
Stops requests that try to escape allowed directories using relative path segments.

### Normalize messy file paths
Cleans up redundant slashes and complex relative paths automatically.

### Audit directory configurations
Checks your allowed root list for any accidental security holes or forbidden zones.

### Preview path resolutions
Shows you exactly how a complex string will look after expansion before any permission checks occur.

### Verify access permissions
Confirms if a specific file request matches your current security policy.

## Use Cases

### Securing log analysis workflows
An engineer needs an agent to scan logs in a specific folder. The MCP ensures the agent cannot jump to sensitive system directories.

### Safe automated data processing
A developer lets an agent process CSVs in a designated directory. This prevents the agent from accessing adjacent user data folders.

### Testing agentic file manipulation
A security researcher uses path expansion previews to verify that complex relative paths are correctly resolved before they hit the filesystem.

### Protecting configuration files during deployment
An automated deployment agent is restricted to a specific build directory, preventing accidental reads of system-wide environment variables.

## Benefits

- Stop unauthorized access by blocking any attempts to use relative segments to escape your sandbox.
- Eliminate guesswork with the ability to see exactly how a complex path will resolve using preview_path_expansion.
- Maintain clean configurations by auditing your root directories for accidental forbidden zones using analyze_root_integrity.
- Ensure consistent security policies across different AI clients by using deterministic path normalization.
- Reduce the risk of system compromise when giving agents permission to read local data files via validate_path_access.

## How It Works

The bottom line is that you can give your agents file access without worrying about them wandering into sensitive system folders.

1. Define your allowed root directories and any forbidden zones in your configuration.
2. Connect the MCP to your preferred AI client through V0inkius.
3. Your agent sends path requests which are then intercepted, expanded, and validated against your rules.

## Frequently Asked Questions

**How does Filesystem Sandbox Boundary Enforcer stop hackers?**
It intercepts requests and blocks any path that tries to escape your defined boundaries using traversal techniques.

**Can I use Filesystem Sandbox Boundary Enforcer with Claude?**
Yes, you can connect this MCP to any compatible client like Claude or Cursor via Vinkius to secure your local file interactions.

**Does Filesystem Sandbox Boundary Enforcer handle complex paths?**
It automatically resolves all relative segments and redundant slashes so you always know the true destination of a request.

**How do I know if my configuration is safe with Filesystem Sandbox Boundary Enforcer?**
You can run an integrity check on your allowed directories to ensure no forbidden zones have been included in your setup.

**Will Filesystem Sandbox Boundary Enforcer slow down my agent?**
The path resolution and validation happen almost instantly, providing security without noticeable latency in your workflow.

**How does the server prevent path traversal attacks?**
The server resolves all `..` segments and redundant slashes using deterministic string manipulation before checking if the resulting path starts with an allowed root or matches a forbidden blocklist.

**What directories are blocked by default?**
The server blocks access to sensitive system paths including `/etc`, `/root`, and `~/.ssh` via a hardcoded blocklist.

**Can I use this to audit my existing configuration?**
Yes, you can use the `analyze_root_integrity` tool to check if any of your provided root directories overlap with forbidden system paths.