io.github.daedalus/mcp-rpn
mcp-rpn
MCP server that exposes an RPN calculator
alive probed 2026-10-15
2tools
339tokens in Claude Opus 5.5
363tokens in Claude Code
0.2 %of a 200k context window
190o200k_base estimate
7.7 sto initialize
514 msto list tools
- Run it
- uvx mcp-rpn==0.1.1 (stdio, probed in a container with the network off)
- Host
- pypi.org
- Reports itself as
- mcp-rpn 4.1.0
- Capabilities
- logging, prompts, resources, 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/daedalus/mcp-rpn
- Registry
- active, updated 2026-04-09 · registry entry
- Reachable
- 1 of the last 1 probe
Most expensive tools
| Tool | Tokens (o200k) | Share of this server |
|---|---|---|
| evaluate | 148 | 78 % |
| clear | 42 | 22 % |
Badge and feed
[](https://mcpcost.ulehla.dev/s/io.github.daedalus/mcp-rpn)
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.