io.github.mrfentmen/rng-mcp
rng-mcp
Roll dice, flip coins, and generate random values locally. No network and no key.
alive probed 2026-10-15
3tools
344tokens in Claude Opus 5.5
377tokens in Claude Code
0.2 %of a 200k context window
182o200k_base estimate
407 msto initialize
7 msto list tools
- Run it
- npx -y rng-mcp@1.0.0 (stdio, probed in a container with the network off)
- Host
- npmjs.com
- Reports itself as
- rng-mcp 1.0.0
- 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/mrfentmen/rng-mcp
- Registry
- active, updated 2026-09-21 · registry entry
- Reachable
- 1 of the last 1 probe
Most expensive tools
| Tool | Tokens (o200k) | Share of this server |
|---|---|---|
| roll_dice | 72 | 40 % |
| random_number | 67 | 37 % |
| coin_flip | 43 | 24 % |
Badge and feed
[](https://mcpcost.ulehla.dev/s/io.github.mrfentmen/rng-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.