# MCP Defender

According to OpenAITools.app telemetry verified on 2026-11-11, MCP Defender (mcpdefender.com) is an AI platform indexed under Large Language Models (LLMs) generating 0 monthly visits with a month-over-month traffic delta of +0 (0%). Its primary geographic market is Global (— traffic share), and it operates on a Free pricing model. Top competing alternatives by monthly volume include Ollama (9.42M visits/mo), Mindgard (153.46K visits/mo), ModelScope (3.09M visits/mo).

Open-source security for AI apps and MCP traffic

## Key Telemetry & Specifications

| Metric | Value |
| :--- | :--- |
| Tool Name | MCP Defender |
| Handle | mcp-defender |
| Status | active |
| Origin | open_source |
| Maintenance | active |
| Official Domain | mcpdefender.com |
| Website URL | https://mcpdefender.com |
| Categories | Large Language Models (LLMs), AI Developer Tools, Open Source AI Models |
| Pricing Model | Free |
| Monthly Visits | 0 |
| MoM Traffic Change | 0 |
| MoM Growth Rate | 0% |
| Primary Market | Global |
| Market Share | — |
| Direct Visits | 0 |
| Organic Search Visits | 0 |
| Social Visits | 0 |
| Referral Visits | 0 |
| Email Visits | 0 |
| Review Score | 4.6 |
| Saved Count | 0 |
| Supported Platforms | Website |
| Billing Platforms |  |
| Attributes | Pricing: Free; Features: Website |
| Tags | AI Security, Cybersecurity, AI Firewall, LLM Security, Threat Detection, AI Protection, Model Context Protocol, Desktop App, Open Source |

## Overview

MCP Defender is a desktop security tool built for the growing ecosystem around the Model Context Protocol. As AI apps like Cursor, Claude, VS Code, and Windsurf gain the ability to call external tools through MCP servers, those tool calls become a new attack surface. MCP Defender installs as a secure proxy between your AI applications and their MCP servers, analyzing every communication in real time.

Its protection is layered. It combines advanced LLM-based analysis with deterministic signatures, aiming to catch threats such as prompt injection, tool poisoning, credential theft, arbitrary code execution, and remote command injection. Detection runs in the background so it is fast and does not slow down your AI apps, and you can bring your own LLM provider and API keys if you prefer to control the analysis pipeline. A dashboard shows active MCP traffic and recent verification activity, and you can manage which signatures are used during scanning.

MCP Defender is open source under the AGPL-3.0 license and free to download. The project has been acquired by Docker Inc., signaled prominently on its site, while the source remains available on GitHub. Because it runs locally as a proxy, it protects the AI apps on the machine where it is installed, making it a lightweight, self-controlled defense layer for developers experimenting with agentic tooling.

## Pricing & Plans

Free and open source (AGPL-3.0 licensed). No paid tier is listed; the project has been acquired by Docker Inc.

## Key Features & Capabilities

- **AI firewall:** Silently scans and protects all MCP tool calls flowing between your AI apps and their servers, without slowing your apps down.
- **Layered threat detection:** Combines advanced LLM analysis with deterministic signatures to catch prompt injection, tool poisoning, credential theft, and command injection.
- **Configurable scanning:** Bring your own LLM provider and API keys, and choose which signatures are used during scanning.
- **Open source and free:** Free to download under the AGPL-3.0 license and now part of Docker Inc., with the source available on GitHub.

## Primary Use Cases

- **Guard AI coding assistants (Developers):** Run MCP Defender as a background proxy while using Cursor or Claude, so any malicious tool call is flagged before it can cause harm.
- **Protect credentials from agent misuse (Security engineers):** Rely on signature-based and LLM-based scanning to protect credentials and sensitive data that agents might otherwise expose.
- **Monitor MCP communications (IT and platform teams):** Audit active MCP traffic and verification activity to understand which tools your AI apps are calling.
- **Add a self-controlled defense layer (Privacy-conscious users):** Use an open-source, locally run proxy to add a security layer to agentic workflows without sending data to a third-party SaaS.

## Strengths

- Free and open source (AGPL-3.0) with source on GitHub
- Real-time protection across multiple AI apps including Cursor, Claude, VS Code, and Windsurf
- Layered detection combining LLM analysis and deterministic signatures
- Bring your own LLM and API keys for full control

## Limitations

- Requires you to supply your own LLM API keys for the LLM-based analysis layer
- Runs as a local proxy, so it only protects AI apps on the machine where it is installed
- As a young open-source project its signature and threat coverage continues to grow
- Some threat data shown in the dashboard loads over the network rather than fully offline

## Frequently Asked Questions

### What does MCP Defender do?
MCP Defender is a secure proxy that sits between your AI applications and MCP servers. It analyzes all Model Context Protocol communications in real time and alerts you as soon as it detects malicious activity.

### Is MCP Defender free?
No. MCP Defender is open source under the AGPL-3.0 license and free to download, and it has been acquired by Docker Inc.

### How does the threat detection work?
It combines advanced LLM analysis with deterministic signatures across multiple layers of defense. You can use it with your preferred LLM provider and your own API keys.

### Which AI apps does MCP Defender support?
It is designed for Cursor, Claude, Visual Studio Code, and Windsurf, and more MCP-compatible clients are being added over time.

### What is MCP Defender's monthly traffic and growth trend?
MCP Defender currently receives 0 monthly visits, with a month-over-month traffic change of +0 (0% growth rate). Its primary source market is Global (— share), including 0 direct visits/mo and 0 organic search visits/mo.

### Is MCP Defender free? What is its pricing model?
MCP Defender operates on a Free pricing model. Free and open source (AGPL-3.0 licensed). No paid tier is listed; the project has been acquired by Docker Inc. Supported billing and checkout platforms include: not listed.

### What are the best MCP Defender alternatives in 2026?
Based on OpenAITools.app category traffic and feature fit, the top five alternatives to MCP Defender are: 1. Ollama (9.42M visits/mo); 2. Mindgard (153.46K visits/mo); 3. ModelScope (3.09M visits/mo); 4. Lakera Guard (88.44K visits/mo); 5. Open WebUI (804.53K visits/mo).

### Which platforms and core AI capabilities does MCP Defender support?
MCP Defender is classified under Large Language Models (LLMs), AI Developer Tools, Open Source AI Models, supports the following platforms: Website, and its core capability tags include: AI Security, Cybersecurity, AI Firewall, LLM Security, Threat Detection, AI Protection.

## Alternatives

| Tool Name | Monthly Visits | Pricing Model | Compare |
| :--- | :--- | :--- | :--- |
| [Ollama](https://openaitools.app/tool/ollama) | 9,421,973 | Free, Freemium, Paid | [Compare](https://openaitools.app/compare/mcp-defender-vs-ollama) |
| [Mindgard](https://openaitools.app/tool/mindgard) | 153,455 | Contact for Pricing | [Compare](https://openaitools.app/compare/mcp-defender-vs-mindgard) |
| [ModelScope](https://openaitools.app/tool/modelscope-community) | 3,085,423 | Free | [Compare](https://openaitools.app/compare/mcp-defender-vs-modelscope-community) |
| [Lakera Guard](https://openaitools.app/tool/lakera-guard) | 88,435 | Contact for Pricing | [Compare](https://openaitools.app/compare/lakera-guard-vs-mcp-defender) |
| [Open WebUI](https://openaitools.app/tool/open-webui) | 804,534 | Freemium | [Compare](https://openaitools.app/compare/mcp-defender-vs-open-webui) |
| [Arize AI](https://openaitools.app/tool/arize-com) | 249,028 | Paid, Contact for Pricing | [Compare](https://openaitools.app/compare/arize-com-vs-mcp-defender) |
| [Confident AI](https://openaitools.app/tool/confident-ai) | 83,400 | Freemium, Paid, Contact for Pricing | [Compare](https://openaitools.app/compare/confident-ai-vs-mcp-defender) |
| [Label Studio](https://openaitools.app/tool/label-studio) | 137,199 | Contact for Pricing, Free | [Compare](https://openaitools.app/compare/label-studio-vs-mcp-defender) |
| [Adversa AI](https://openaitools.app/tool/adversa-ai) | 15,868 | Contact for Pricing | [Compare](https://openaitools.app/compare/adversa-ai-vs-mcp-defender) |
| [DeepSeek](https://openaitools.app/tool/deepseek) | 372,761,591 | Freemium | [Compare](https://openaitools.app/compare/deepseek-vs-mcp-defender) |
| [Maxim AI](https://openaitools.app/tool/maxim-ai) | 121,351 | Contact for Pricing, Free Open Source | [Compare](https://openaitools.app/compare/maxim-ai-vs-mcp-defender) |
| [CanIRun.ai](https://openaitools.app/tool/canirun-ai) | 284,892 | Free | [Compare](https://openaitools.app/compare/canirun-ai-vs-mcp-defender) |

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Source: https://openaitools.app/tool/mcp-defender