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TestLens

MCP server · hosted · v1.1.0 · net.bigfloppy.testlens/testlens
Online · tested 1h agoNEW · 2h agoSeen in the registry 1h ago

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

Website ↗Source code ↗How to connect ↓

What it does

TestLens is an MCP server, a connector that lets an AI assistant use it as a tool. It is hosted: an assistant connects to it over the internet, nothing to install.

No capability identified yet from its description.

Facts come from the Official MCP Registry, as declared by the publisher. Capabilities are matched automatically (low confidence). None of this is a test of the tool.

At a glance

Hosted (remote)YES
Local installNO
Version1.1.0
PriceNot in the registry
First seen25 Oct 2026
Last checked1h ago

How to connect

As declared in the Official MCP Registry · hosted endpoint tested by Electra Index 1h ago (live check)

Hosted endpoint

  • https://testlens.bigfloppy.net/mcp streamable-http

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

MCP settings (Claude Desktop, Cursor and other MCP clients)

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

Live check

Electra Index connected to the hosted endpoint 1h ago

ONLINE TestLens answered an MCP connection on 25 Oct 2026 and introduced itself as testlens 1.1.0 (MCP protocol 2025-06-18).

2 tools offered to AI assistants

  • testlens_mutate · Mutation-test Python code: submit the module code and unittest test cases; TestLens generates small mutants (flipped comparisons, swapped operators, inverted booleans), runs the tests against each and reports the mutation score plus every S
  • testlens_health · Check the TestLens API is up. Takes no arguments.

What "online" means: the server answered an MCP connection at the time of the check. It is not a guarantee of security, quality or continuous uptime. How we test: we open an MCP session and ask for the tool list, as an AI assistant would. We never run a tool and never send a key. Checked every few days. Method

Is this your server? Monitoring Pro: a check every 30 minutes and an email within the hour when it stops answering. Launch offer: $39.99 once, for life.

Facts & evidence

Each fact shows where it was seen and when.
FactValueEvidenceSourceLast confirmed
Hosted endpointhttps://testlens.bigfloppy.net/mcpDECLAREDSRC-001 Official MCP Registry1h ago
Local install (package)noDECLAREDSRC-001 Official MCP Registry1h ago
Remote access (hosted)yesDECLAREDSRC-001 Official MCP Registry1h ago
Websitehttps://testlens.bigfloppy.net/DECLAREDSRC-001 Official MCP Registry1h ago
Repositoryhttps://github.com/wminno/testlensDECLAREDSRC-001 Official MCP Registry1h ago
Registry statusactiveDECLAREDSRC-001 Official MCP Registry1h ago
Version1.1.0DECLAREDSRC-001 Official MCP Registry1h ago
MCP serveryesDECLAREDSRC-001 Official MCP Registry1h ago

Change history

  • NEW25 Oct 2026
    first seen in the index

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Questions about TestLens

How do I connect TestLens?

Use the hosted endpoint https://testlens.bigfloppy.net/mcp in your assistant's MCP settings. The exact settings are in "How to connect" above, as declared in the Official MCP Registry.

What tools does TestLens offer?

When Electra Index connected on 25 Oct 2026, it listed 2 tools: testlens_mutate, testlens_health. The full list is in "Live check" above.

Is TestLens online?

Yes. Its hosted endpoint answered an MCP connection from Electra Index 1h ago.