io.github.vulinh1704/mantis

Mantis

Is the Mantis MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-31.

Real-browser UI checks and speed audits for coding agents, catching fixes that only hide the bug.

alive probed 2026-11-14 · unchanged since 2026-10-31

4tools

2.2ktokens in Claude Opus 5.5

1.1 %of Claude's 200k window

0.9×the median server

903 msto initialize

6 msto list tools

Run it: npx -y @vulinh1704/mantis@0.7.0 (stdio, probed in a container with the network off)
Host: npmjs.com
Reports itself as: mantis 0.7.0
Capabilities: tools
Instructions: 371 characters
Of a 1M window: 0.2 % of a 1M context window
Count: 2.2k tokens in Claude Opus 5.5, exact, measured 2026-10-31. With the Claude Code prefix mcp__…__ on each tool name: 2.2k. The o200k_base estimate is 1.4k. Counted again when the tool definitions change. Method.
Repository: https://github.com/vulinh1704/mantis
Registry: active, updated 2026-10-30 · registry entry

Most expensive tools

The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.61×.

Tool	≈ Claude tokens	o200k estimate	Share of this server
mantis_look	851	530	39 %
mantis_perf	637	397	29 %
mantis_learn	491	306	22 %
mantis_proof	228	142	10 %

Other registry entries on npmjs.com, the ones next to this name; all of them.

Servers that mention mantis.

The result of the latest probe, the tool count and the token cost. The feed has an entry for every probe that changed them.

Stops answering, comes back, tool set or cost changes. One confirmation mail first, a stop link in every mail.