Filesystem MCP Server

Secure File Operations for AI Agents

Official MCP reference implementation providing safe, sandboxed filesystem access with fine-grained permission controls.

Why Filesystem MCP?

🔒 Security-First Design

Sandboxed Access: Agents can only access explicitly allowed directories
Permission Controls: Read-only, write, or full access per directory
Path Validation: Prevents directory traversal and unauthorized access
Audit Trail: All operations logged for security review

🤖 Essential for Agent Workflows

Most agent tasks involve files:

Reading documentation
Writing code files
Analyzing logs
Generating reports
Managing project files
Organizing content

📦 Zero External Dependencies

Pure implementation using Node.js built-in modules. No external API dependencies or rate limits.

Installation

# Official reference implementation
npm install -g @modelcontextprotocol/server-filesystem
Or build from source

git clone https://github.com/modelcontextprotocol/servers
cd servers/src/filesystem
npm install
npm run build

Configuration

Add to your MCP client config:

{
  "mcpServers": {
    "filesystem": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-filesystem",
        "/Users/yourname/Documents",
        "/Users/yourname/Projects"
      ]
    }
  }
}

Arguments = allowed directories (one or more paths)

Permission Modes

Read-Only Access:

"args": ["--read-only", "/path/to/docs"]

Full Access (default):

"args": ["/path/to/workspace"]

Example Configurations

Development Workspace

{
  "mcpServers": {
    "filesystem": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-filesystem",
        "/Users/dev/projects",
        "/Users/dev/workspace"
      ]
    }
  }
}

Documentation Access (Read-Only)

{
  "mcpServers": {
    "filesystem": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-filesystem",
        "--read-only",
        "/Users/docs/knowledge-base"
      ]
    }
  }
}

Available Tools

Directory Operations

1. List Directory (

list_directory

)

Agent: "What files are in my Projects folder?"
Agent: "Show contents of /workspace/src"

Returns:

File names
File types (file, directory, symlink)
File sizes
Last modified timestamps

2. Create Directory (

create_directory

)

Agent: "Create a new folder called 'components'"
Agent: "Make directory /workspace/tests"

3. Move/Rename (

move_file

)

Agent: "Rename old-name.txt to new-name.txt"
Agent: "Move report.pdf to /Documents/Reports/"

File Operations

4. Read File (

read_file

)

Agent: "Read the contents of config.json"
Agent: "Show me the README.md file"

Supports:

Text files (UTF-8)
JSON, YAML, XML
Markdown, code files
Large files (streaming)

5. Write File (

write_file

)

Agent: "Create a file called notes.txt with meeting notes"
Agent: "Write the generated code to src/index.ts"

6. Edit File (

edit_file

)

Agent: "Replace 'version: 1.0' with 'version: 2.0' in package.json"
Agent: "Add a new function to utils.js"

7. Get File Info (

get_file_info

)

Agent: "When was report.pdf last modified?"
Agent: "What's the size of data.csv?"

Returns:

File size (bytes)
Creation time
Last modified time
Permissions
File type

Advanced Operations

8. Search Files (

search_files

)

Agent: "Find all Python files in the project"
Agent: "Search for files containing 'API_KEY'"

Search by:

File name pattern (glob)
File content (regex)
File type
Date modified

9. Delete File (

delete_file

)

Agent: "Delete the temporary log files"
Agent: "Remove old-backup.zip"

Safety:

Requires confirmation for large files
Cannot delete files outside allowed directories
Logged for audit

Agent Workflow Examples

Code Generation

Human: "Create a React component for a login form"
Agent:

create_directory("/workspace/components")
write_file("/workspace/components/LoginForm.tsx", generated_code)
write_file("/workspace/components/LoginForm.test.tsx", test_code)
"Created LoginForm component at components/LoginForm.tsx"

Log Analysis

Human: "Analyze error logs and summarize issues"
Agent:

list_directory("/var/log/app")
read_file("/var/log/app/error.log")
search_files(pattern="ERROR", path="/var/log/app")
generate_summary()
write_file("/reports/error-summary.md", summary)

Project Organization

Human: "Organize my documents by type"
Agent:

list_directory("/Documents")
For each file:

get_file_info(file)
Determine file type
create_directory("/Documents/[type]")
move_file(file, destination_folder)

Documentation Generation

Human: "Generate API documentation from code comments"
Agent:

search_files(pattern="*.ts", path="/src")
For each file:

read_file(file)
extract_doc_comments()


Generate markdown docs
write_file("/docs/API.md", generated_docs)

Security Model

Sandbox Enforcement

What Agents CAN Do:

✅ Access explicitly allowed directories
✅ Create/read/write files within allowed paths
✅ List directory contents
✅ Search within allowed paths

What Agents CANNOT Do:

❌ Access parent directories (
```
../
```
)
❌ Access system files (
```
/etc/
```
,
```
/sys/
```
)
❌ Follow symlinks outside allowed paths
❌ Execute binaries or scripts
❌ Modify file permissions

Path Validation

Allowed: /Users/dev/projects
Agent tries: /Users/dev/projects/src/index.ts → ✅ Allowed
Agent tries: /Users/dev/projects/../secret → ❌ Blocked
Agent tries: /etc/passwd → ❌ Blocked

Best Practices

Principle of Least Privilege
- Grant only necessary directories
- Use
```
--read-only
```
  when write not needed
Never Allow Root Access
- Don't add
```
/
```
  or system directories
- Restrict to user workspace
Audit Agent Actions
- Review MCP server logs regularly
- Monitor for unexpected file access patterns
Separate Sensitive Data
- Keep credentials, keys in separate directories
- Don't include in allowed paths

Use Cases

📝 Content Management

Agents generate blog posts, reports, documentation and save to organized folders.

🤖 Code Assistants

Read project files, generate code, create tests, update configurations.

📊 Data Analysis

Read CSV/JSON data files, analyze, generate reports and visualizations.

🗂️ File Organization

Scan directories, categorize files, move to appropriate folders, cleanup duplicates.

📚 Knowledge Base

Index markdown files, search documentation, extract information, update wikis.

🔍 Log Analysis

Parse log files, identify errors, generate summaries, create alerts.

Performance

Large Files

Streaming for files >10MB
Incremental reads supported
Memory-efficient processing

Directory Scanning

Recursive search optimized
Glob pattern matching
Ignore patterns (e.g.,
```
node_modules/
```
)

Concurrent Operations

Safe for parallel file access
Atomic write operations
File locking where needed

Troubleshooting

"Permission denied" Error

Verify path is in allowed directories
Check filesystem permissions
Ensure MCP server has read/write access

"Path not found" Error

Confirm directory exists
Check for typos in path
Verify path format (absolute vs relative)

Read-Only Mode Issues

Can't write in
```
--read-only
```
mode
Reconfigure server with write access if needed

vs Other File Access Methods

Method	Security	Agent Integration	Setup
Filesystem MCP	✅ Sandboxed	✅ Auto-discovered	Simple
Direct FS Access	❌ Full system	❌ Manual	None
File Upload/Download	✅ Manual control	⚠️ Limited	Complex
Cloud Storage API	✅ API-level	⚠️ Requires SDK	Complex

Resources

GitHub: https://github.com/modelcontextprotocol/servers/tree/main/src/filesystem
MCP Docs: https://modelcontextprotocol.io/
Security Best Practices: https://modelcontextprotocol.io/docs/concepts/security

Advanced Configuration

{
  "mcpServers": {
    "filesystem": {
      "command": "node",
      "args": [
        "/path/to/filesystem-server/build/index.js",
        "/workspace",
        "/documents"
      ],
      "env": {
        "MAX_FILE_SIZE": "10485760",
        "ENABLE_LOGGING": "true",
        "LOG_PATH": "/var/log/mcp-filesystem.log"
      }
    }
  }
}

Safe, secure filesystem access for agents: From code generation to log analysis, Filesystem MCP is the foundation for agent file operations.

Filesystem MCP Server

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