It helps expose problems in generated code by checking it from both the builder’s and tester’s point of view.

gauntlex — MCP server for Claude Code by sanjoy1234

gauntlex

gauntlex is an MCP server for Claude Code from sanjoy1234/gauntlex. Its token cost is not measured, scanned A, original, MIT.

A local MCP server for Gauntlex, a Python tool that has one coding agent build software while another tries to break or challenge it.

In plain words

What is it for?: Use it for adversarial code generation and review when developing production software. The input does not describe its setup or individual commands.
Why use it?: It helps expose problems in generated code by checking it from both the builder’s and tester’s point of view.

Written for Claude Code: shipped in a Claude Code plugin.

Part of the gauntlex plugin — 7 skills, 1 MCP server shipped together

Good fit Use it for adversarial code generation and review when developing production software. The input does not describe its setup or individual commands.

Compare 6 mcp servers from other repositories ↓

Install with agentmods

npx agentmods add mcp/sanjoy1234/gauntlex/gauntlex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo

git clone --depth 1 https://github.com/sanjoy1234/gauntlex

Made for: Claude Code.

Or install gauntlex, the plugin that ships this one along with the rest of its 7 skills, 1 MCP server.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/mcp/sanjoy1234/gauntlex/gauntlex.svg)](https://agentmods.dev/mcp/sanjoy1234/gauntlex/gauntlex)

Your own site

<a href="https://agentmods.dev/mcp/sanjoy1234/gauntlex/gauntlex"><img src="https://agentmods.dev/badge/mcp/sanjoy1234/gauntlex/gauntlex.svg" alt="Measured on agentmods" height="20"></a>

Per session not measured What this adds to a session before it is invoked.

When invoked not measured Not applicable: nothing here is loaded into a session.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

gauntlex scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

server.json · 9 lines

What it actually says

{
  "gauntlex": {
    "command": "uvx",
    "args": [
      "gauntlex-ai"
    ],
    "env": {}
  }
}

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

8d ago First seen · 9 lines scan A ce064a6b7084

Subscribe to this mod's changes

gauntlex is an MCP server published in the GitHub repository sanjoy1234/gauntlex (1 stars, last pushed 1mo ago), licensed MIT. Its token cost is not measured: an MCP server costs its tool schemas, not its config file. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Building agents Claude Code Testing adversarial-testing ai-code-generation ai-security devsecops llm-security

gauntlex

Getting it into your agent

Wrote this? Show the measurements

Grade A, and why

Nothing flagged

What it actually says

What this file has done since we first saw it

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