io.github.YuanHuakk/js-reverse-mcp
JS Reverse MCP
Is the JS Reverse MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-30.
MCP server for JavaScript reverse engineering and browser debugging.
alive probed 2026-11-15 · unchanged since 2026-10-30
90tools
23ktokens in Claude Opus 5.5
11.6 %of Claude's 200k window
9.2×the median server
2.6 sto initialize
36 msto list tools
- Run it
- npx -y @yuanhuakk/js-reverse-mcp@2.5.0 (stdio, probed in a container with the network off)
- Host
- npmjs.com
- Reports itself as
- js_reverse_mcp 2.5.0
- Capabilities
- logging, tools
- Instructions
- none
- Of a 1M window
- 2.3 % of a 1M context window
- Count
- 23k tokens in Claude Opus 5.5, exact, measured 2026-10-16. With the Claude Code prefix mcp__…__ on each tool name: 24k. The o200k_base estimate is 13k. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/YuanHuakk/js-reverse-mcp
- Registry
- active, updated 2026-06-22 · 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 |
|---|---|---|---|
| analyze_target | 843 | 472 | 4 % |
| collect_code | 780 | 437 | 3 % |
| crypto_verify | 687 | 385 | 3 % |
| auto_patch_env | 646 | 362 | 3 % |
| replay_request | 582 | 326 | 3 % |
Compare this server with others.
More servers
Other registry entries on npmjs.com, the ones next to this name; all of them.
- io.github.YogiAdhik/civicrm-mcp · needs env
- io.github.YonasValentin/mcp-memory-graph · alive
- io.github.YottaMeta/yotta-verify-mcp · alive
- JS Reverse MCP io.github.YuanHuakk/JSReverser-MCP · alive
- io.github.Yummybait-fin/uniswap-tx-builder-mcp · alive
- WrapGuard MCP io.github.Yuni9959/wrapguard-mcp · alive
- io.github.Yuuqq/jules-dispatch · alive
- io.github.YuzuKyouma/ponzu · alive
Servers that mention reverse.
- hood. — .hood name service ag.hood/name-service · alive
- NeedToFind app.needtofind/needtofind · needs auth
- 1820.ch – Telefonbuch Schweiz ch.1820/telefonbuch · alive
- RPN Calculator com.apished/rpn-calculator · not MCP
- CacheBoost com.cache-boost/cacheboost · needs auth
- DaedalMap Reverse Geocoding (coordinates to loc_id) com.daedalmap/reverse-geocoding · rate limited
- GoAI Moat Email Person Lookup com.goaimoat/email-person-lookup · server error
- com.localtonet/mcp · needs auth
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
- This server is in the heaviest 10 % of the registry. Shorter descriptions, fewer optional parameters and fewer tools cut the cost. The command npx mcpcost --url <endpoint> --tools 50 lists every tool with its cost.