io.github.theSharque/javaperf
javaperf
Java profiling MCP via jcmd/jfr/jps. Diagnose performance, analyze threads, inspect JFR recordings.
alive probed 2026-10-15
26tools
7.1ktokens in Claude Opus 5.5
7.4ktokens in Claude Code
3.6 %of a 200k context window
3.9ko200k_base estimate
429 msto initialize
18 msto list tools
- Run it
- npx -y javaperf@1.4.2 (stdio, probed in a container with the network off)
- Host
- npmjs.com
- Reports itself as
- javaperf 1.4.2
- 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/theSharque/mcp-jperf
- Registry
- active, updated 2026-09-27 · registry entry
- Reachable
- 1 of the last 1 probe
Most expensive tools
| Tool | Tokens (o200k) | Share of this server |
|---|---|---|
| start_profiling | 347 | 9 % |
| trace_method | 307 | 8 % |
| heap_live_histogram_diff | 242 | 6 % |
| parse_jfr_summary | 229 | 6 % |
| profile_memory | 202 | 5 % |
Badge and feed
[](https://mcpcost.ulehla.dev/s/io.github.theSharque/javaperf)
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.