net.bigfloppy.testlens/testlens
TestLens
Is the TestLens MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-26.
Paste code + tests, get a strong/weak verdict with killed/survived mutants. Free API + MCP.
alive probed 2026-11-15 · unchanged since 2026-10-26 · HTTP 200
- Endpoint
- https://testlens.bigfloppy.net/mcp (streamable-http)
- Host
- testlens.bigfloppy.net
- Protocol
- 2025-06-18
- Reports itself as
- testlens 1.1.0
- Capabilities
- tools
- Instructions
- 109 characters
- Of a 1M window
- <0.1 % of a 1M context window
- Count
- 275 tokens in Claude Opus 5.5, exact, measured 2026-10-25. With the Claude Code prefix mcp__…__ on each tool name: 291. The o200k_base estimate is 154. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/wminno/testlens
- Website
- https://testlens.bigfloppy.net/
- Registry
- active, updated 2026-10-25 · registry entry
Most expensive tools
The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.79×.
| Tool | ≈ Claude tokens | o200k estimate | Share of this server |
|---|---|---|---|
| testlens_mutate | 216 | 121 | 79 % |
| testlens_health | 59 | 33 | 21 % |
Compare this server with others.
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Badge for the README
The result of the latest probe, the tool count and the token cost. The feed has an entry for every probe that changed them.
A mail when this server changes
Stops answering, comes back, tool set or cost changes. One confirmation mail first, a stop link in every mail.
For the publisher
- The server answers initialize and tools/list. Nothing to fix.
Fixed something? Probe it now, with the same steps as the daily run. This page updates with the next daily run.