MCP server

TestLens

net.bigfloppy.testlens/testlens

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

Paste code + tests, get a strong/weak verdict with killed/survived mutants. Free API + MCP.

Working at last checkVerified publisher: bigfloppy.netAbout 206 tokens per request once connected2 tools

https://testlens.bigfloppy.net/mcp

At a glance

Type: MCP server
Publisher: bigfloppy.net (verified by the MCP Registry)
Status: Working at last check
Tools: 2
Token cost: About 206 tokens per request
Sets up in: Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok
Last checked: 26 Oct 2026, 08:29 UTC

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http testlens https://testlens.bigfloppy.net/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.testlens]
url = "https://testlens.bigfloppy.net/mcp"

Gemini CLI

{"mcpServers":{"testlens":{"httpUrl":"https://testlens.bigfloppy.net/mcp"}}}

Cursor

{"mcpServers":{"testlens":{"url":"https://testlens.bigfloppy.net/mcp"}}}

VS Code

{"servers":{"testlens":{"type":"http","url":"https://testlens.bigfloppy.net/mcp"}}}

Antigravity

agy mcp add testlens https://testlens.bigfloppy.net/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"testlens","server_url":"https://testlens.bigfloppy.net/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"testlens","server_url":"https://testlens.bigfloppy.net/mcp"}

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