io.github.mrfentmen/lobster-mcp

lobster-mcp

Is the io.github.mrfentmen/lobster-mcp MCP server down? No. It answered initialize and tools/list in the probe of 2026-11-09.

MCP server for the Lobster programming langua MCP: real tools for real work.

alive probed 2026-11-15 · unchanged since 2026-11-09

16tools

2.6ktokens in Claude Opus 5.5

1.3 %of Claude's 200k window

1.0×the median server

323 msto initialize

13 msto list tools

Run it: npx -y lobster-mcp@1.1.0 (stdio, probed in a container with the network off)
Host: npmjs.com
Reports itself as: lobster-mcp 1.1.0
Capabilities: tools
Instructions: none
Of a 1M window: 0.3 % of a 1M context window
Count: 2.6k tokens in Claude Opus 5.5, exact, measured 2026-11-09. With the Claude Code prefix mcp__…__ on each tool name: 2.8k. The o200k_base estimate is 1.5k. Counted again when the tool definitions change. Method.
Repository: https://github.com/mrfentmen/awesome-servers
Registry: active, updated 2026-11-08 · registry entry

Most expensive tools

The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.74×.

Tool	≈ Claude tokens	o200k estimate	Share of this server
run_code	376	216	15 %
search_builtins	253	145	10 %
search_docs	216	124	8 %
search_samples	206	118	8 %
lookup_builtin	169	97	7 %

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

Servers that mention lobster.

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.