io.github.ip2k/rarefaction-lsp-mcp
Rarefaction
LSP call graph for coding agents: a symbol's callers, callees, tests and live files in one call.
alive probed 2026-10-15
2tools
955tokens in Claude Opus 5.5
991tokens in Claude Code
0.5 %of a 200k context window
543o200k_base estimate
459 msto initialize
40 msto list tools
- Run it
- npx -y rarefaction-lsp-mcp@0.2.2 (stdio, probed in a container with the network off)
- Host
- npmjs.com
- Reports itself as
- rarefaction 0.2.2
- Capabilities
- tools
- Instructions
- none
- Claude count
- Claude Opus 5.5, measured 2026-10-15. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/ip2k/rarefaction
- Website
- https://github.com/ip2k/rarefaction#readme
- Registry
- active, updated 2026-10-15 · registry entry
- Reachable
- 1 of the last 1 probe
Most expensive tools
| Tool | Tokens (o200k) | Share of this server |
|---|---|---|
| orient | 407 | 75 % |
| status | 136 | 25 % |
Badge and feed
[](https://mcpcost.ulehla.dev/s/io.github.ip2k/rarefaction-lsp-mcp)
An entry for every probe that changed the result, the tool count or the token cost: Atom feed. Add it to a feed reader or a Slack RSS app to hear when the server stops answering or its tool set grows.