io.github.vmoranv/jshookmcp

jshookmcp

Is the io.github.vmoranv/jshookmcp MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-30.

Search-first MCP server for JavaScript reverse engineering: 735 tools across 36 domains.

alive probed 2026-11-14 · unchanged since 2026-10-30

8tools

2.4ktokens in Claude Opus 5.5

1.2 %of Claude's 200k window

0.9×the median server

991 msto initialize

26 msto list tools

Run it: npx -y @jshookmcp/jshook@0.4.2 (stdio, probed in a container with the network off)
Host: npmjs.com
Reports itself as: jshookmcp 0.4.2
Capabilities: completions, logging, prompts, resources, tasks, tools
Instructions: none
Of a 1M window: 0.2 % of a 1M context window
Count: 2.4k tokens in Claude Opus 5.5, exact, measured 2026-10-16. With the Claude Code prefix mcp__…__ on each tool name: 2.5k. The o200k_base estimate is 1.4k. Counted again when the tool definitions change. Method.
Repository: https://github.com/vmoranv/jshookmcp
Website: https://vmoranv.github.io/jshookmcp/
Registry: active, updated 2026-10-10 · registry entry

Most expensive tools

The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.70×.

Tool	≈ Claude tokens	o200k estimate	Share of this server
search_tools	758	445	32 %
call_tool	344	202	14 %
route_tool	327	192	14 %
activate_tools	305	179	13 %
activate_domain	199	117	8 %

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

Servers that mention engineering or javascript.

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.