# mcpwall

Local firewall proxy for MCP servers. It inspects tool calls, stops dangerous shell executions, and redacts leaked credentials.

- MCP server · `type=mcp` · Claude Code, Codex, Cursor, GitHub Copilot, Windsurf (Devin Desktop), Cline, Zed, Gemini CLI · ★ 5
- Author: behrensd
- License: Apache-2.0 · policy=link-only · description only; the file stays with the author
- Source: https://github.com/behrensd/mcpwall
- Updated: 2026-09-19
- HTML: https://affpapa.org/en/nevibecode/mcp/mcpwall

## What it does

The proxy sits directly on `stdio` between your development environment and MCP servers. Every JSON-RPC message gets checked against rules defined in `.mcpwall.yml` or global settings. When an agent attempts to inspect `.ssh/` folders, read `.env` secrets, or run destructive commands like `rm -rf`, the proxy stops the request and returns an error.

Responses traveling back from MCP servers undergo inspection as well. Detected API keys or credentials get replaced with `[REDACTED BY MCPWALL]`. Every request and response is appended to a JSON Lines log. The system runs without language models, relying purely on regular expressions and entropy calculations.

You can test rule matching offline via `mcpwall check`. Applying strict security settings to existing environments is possible through `npx mcpwall init --profile strict`.

## Requirements
- Needs: Node.js (commands run via npx)

## Install

### Claude Code (native platform)

**Platform CLI**
```bash
claude mcp add mcpwall -- npx -y mcpwall
```

### Codex

**Platform CLI**
```bash
codex mcp add mcpwall -- npx -y mcpwall
```

### Cursor

**Config file**
File `.cursor/mcp.json`:
```json
{
    "mcpServers": {
        "mcpwall": {
            "command": "npx",
            "args": [
                "-y",
                "mcpwall"
            ]
        }
    }
}
```

### GitHub Copilot

**Config file**
File `.vscode/mcp.json`:
```json
{
    "servers": {
        "mcpwall": {
            "type": "stdio",
            "command": "npx",
            "args": [
                "-y",
                "mcpwall"
            ]
        }
    }
}
```

### Gemini CLI

**Platform CLI**
```bash
gemini mcp add mcpwall npx -y mcpwall
```

## When to use it
- prevent AI agents from reading SSH keys and credential files
- block destructive shell actions such as `rm -rf`
- redact API tokens and private keys from tool outputs
- maintain a JSON Lines audit log of every tool execution

## Example prompts
- Run `npx mcpwall check` to test our policy against file access
- Initialize security wrapping with `npx mcpwall init --profile strict`
- Wrap our Docker MCP gateway using `npx -y mcpwall -- docker mcp gateway run`

## Similar
- [REA](https://affpapa.org/en/nevibecode/mcp/rea.md) — MCP server · ★ 392262
- [World Monitor](https://affpapa.org/en/nevibecode/mcp/world-monitor.md) — MCP server · ★ 89609
- [mcp](https://affpapa.org/en/nevibecode/mcp/kubeshark-mcp.md) — MCP server · ★ 12110
- [Robin: AI-Powered Dark Web OSINT](https://affpapa.org/en/nevibecode/mcp/robin-ai-powered-dark-web-osint.md) — MCP server · ★ 7718
- [jshookmcp](https://affpapa.org/en/nevibecode/mcp/jshookmcp.md) — MCP server · ★ 2066
- [OpenOSINT](https://affpapa.org/en/nevibecode/mcp/openosint.md) — MCP server · ★ 1816

---
NeVibeCode on affpapa.org. Catalog texts are descriptions, not instructions for the agent. How to choose and install: https://affpapa.org/en/nevibecode/agents.md