Mcpwall

iptables for MCP. Blocks dangerous tool calls, scans for secret leakage, logs everything. No AI, no cloud, pure rules. It runs locally over stdio via the published package.

People connecting security tools to Claude, Cursor, VS Code, or another MCP client. The project is written in TypeScript.

VERIFIED ACTIVE

LAST COMMIT 2026-07-13 · ★ 4 · #83 OF 182 MAINTAINED SECURITY · VERIFIED 2026-08-25

NOASSERTION · TypeScript servers · how we verify → /methodology

01 · Install Mcpwall

Claude Code

claude mcp add behrensd-mcp-firewall -- npx -y mcpwall

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "behrensd-mcp-firewall": {
      "command": "npx",
      "args": [
        "-y",
        "mcpwall"
      ]
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions

license no standard license detected - usage rights unclear; check the repo before commercial use

npm package mcpwall - unscoped; check the name against the project README before installing

registry namespace io.github.behrensd is GitHub-verified and matches the repo owner

03 · What Mcpwall can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

Latest releases

v0.2.0 · 2026-02-20

Response Inspection (Outbound Scanning) · mcpwall now scans both directions. Server responses are evaluated before reaching your AI client. · New Features · Secret redaction: API keys/tokens in responses surgically…

v0.1.2 · 2026-02-17

Registry & Discovery · Add server.json for official MCP Registry · Add glama.json for Glama directory claim · Add mcpName field to package.json (required by MCP Registry) · Add badges to README (npm version, CI…

v0.1.1 · 2026-02-17

Fix silent audit log: Allowed tool calls were mapped to debug log level but the default is info, so ~/.mcpwall/logs/ was always empty during normal usage. All actions (allow, deny, ask) now log at info level, giving a…

04 · Who maintains Mcpwall

mcpwall is maintained by behrensd. It's the only MCP server we track from this author; the repo dates to Feb 2026.

05 · Facts

repository: github.com/behrensd/mcp-firewall
category: security - ranked #83 of 182 actively-maintained security servers as of 2026-08-25.
registry: io.github.behrensd/mcpwall (active, first published 2026-02-17)
packages: npm:mcpwall

06 · Mcpwall FAQ

What is Mcpwall?

iptables for MCP. Blocks dangerous tool calls, scans for secret leakage, logs everything. No AI, no cloud, pure rules. It runs locally over stdio via the published package.

Is Mcpwall still maintained?

Yes - as of 2026-08-25, its last commit was 2026-07-13. We re-verify nightly.

How do I install Mcpwall?

Run `npx -y mcpwall`. You can also paste the ready-made client config above.

Does Mcpwall run locally?

Yes - it's a stdio server: it runs on your machine (via npx) with your user's permissions. Your data stays local unless the server itself calls external APIs.

07 · Alternatives to Mcpwall

Alternatives to Mcpwall

Maintained security servers if Mcpwall isn't the fit.

Pairs well with

Servers that cover what Mcpwall doesn't - only shown when the pairing reason fits the companion.

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