TestLens is answering right now. Last checked 6 min ago. It exposes 2 tools. Last commit 27 Oct 2026.
Paste code + tests, get a strong/weak verdict with killed/survived mutants. Free API + MCP.
What the code does
We read the source, 3 d ago · tools taken from the live server · rules 995398eba69f
What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.
p = subprocess.run(cmd, cwd=directory, capture_output=True, text=True, timeout=timeout,
data = open(os.path.join(BASE, ".well-known", name), "rb").read()
Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.
This code can reach further than it looks
We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.
Connect this server
Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 6 min ago.
claude mcp add testlens --transport http https://testlens.bigfloppy.net/mcphttps://testlens.bigfloppy.net/mcp[mcp_servers.testlens]
url = "https://testlens.bigfloppy.net/mcp"{
"mcpServers": {
"testlens": {
"url": "https://testlens.bigfloppy.net/mcp"
}
}
}{
"servers": {
"testlens": {
"type": "http",
"url": "https://testlens.bigfloppy.net/mcp"
}
}
}Available tools 2
Read directly from the server with tools/list, grouped by what they act on.
If a tool disappears, we record the date.
testlens_health
testlens_mutate
Endpoints
| URL | Transport | State | Latency | Checked |
|---|---|---|---|---|
| https://testlens.bigfloppy.net/mcp | streamable-http | answering | 149 ms | 6 min ago |
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TestLens — questions
Answers built from our own checks of this server.