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Edgehound

Official registry Developer tools

Writes adversarial test suites for AI-built code. Your agent's test engineer.

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http edgehound 'https://gauntlet.mcpize.run/mcp'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "edgehound": {
            "type": "http",
            "url": "https://gauntlet.mcpize.run/mcp"
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. Edgehound
  2. What it does
  3. Install
  4. Make it automatic
  5. What a run looks like
  6. Issues
  7. Status

Edgehound

An MCP server that writes test suites designed to break your code.

This repo is the public front door — install guide, examples, and issue tracking. The generation engine runs as a hosted service, so there is nothing here to build or self-host.

What it does

Point your AI agent at a file, and Edgehound writes a complete, runnable test suite that attacks it: boundary values, unicode and emoji, timezone and month-end math, float money rounding, double submits, injection strings, pagination edges. It also predicts — before you run anything — which bugs the suite will expose, with the exact code evidence for each.

Works with Claude Code, Cursor, opencode, VS Code, and any MCP client.

Install

Add the server to your MCP config:

{
  "mcpServers": {
    "faultline": {
      "url": "https://gauntlet.mcpize.run/mcp"
    }
  }
}

On first use your client will ask you to sign in to MCPize. After that:

"write tests for src/pricing.ts"

and your agent does the rest.

Make it automatic

Paste this into your project's rules file (CLAUDE.md, AGENTS.md, or .cursor/rules), and your agent will reach for Edgehound every time it writes or changes input-handling code — no prompting needed:

Whenever you create or modify code that accepts input, touches money, handles
dates, or manages state — call the Edgehound tool (generate_test_suite) before
marking the task complete. Save the returned suite next to the file, run it,
and fix any failing test by fixing the code, not by weakening the test.
Skip only for pure UI markup, copy changes, and configuration.

What a run looks like

examples/user-utils.js has four innocent-looking helpers. A real generation produced 60 tests — 55 passed, 5 failed. Every failure was a real bug in the sample:

  • parseDuration('1h30m') returns 3600 — it silently drops the minutes
  • monthlyPrice leaks float drift on non-divisible cents
  • half-value money rounding is unhandled
  • negative input produces a negative price
  • truncate blows up when handed a number instead of a string

Try it:

node --test examples/user-utils.test.js

Languages today: JavaScript/TypeScript (Jest, Vitest, node:test), Python (pytest), Go, PHP (PHPUnit), Ruby (RSpec), Rust (cargo test).

Issues

Bugs, weird output, missing languages — open an issue here. We read everything and ship fixes fast. Want Go/Rust/PHP improvements or a language we don't cover yet (Java, C#, Swift)? Say so in an issue; demand decides what gets added next.

Status

v1.1 — predicted-bug reports, syntax-validated output with auto-repair, multi-file context, 8 test frameworks.

Frequently asked questions

What is Edgehound?

Writes adversarial test suites for AI-built code. Your agent's test engineer.

How do I install Edgehound?

It runs as a remote server. In Claude Code: claude mcp add --transport http edgehound 'https://gauntlet.mcpize.run/mcp'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does Edgehound need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is Edgehound open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains Edgehound?

It is published by Energixe. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.