io.github.usamahz/cpu-perf

CPU Performance Engineering

Is the CPU Performance Engineering MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-30.

A CPU performance engineering brain: a vetted reading list, benchmarks and cited source passages

alive probed 2026-11-14 · unchanged since 2026-10-30

13tools

4.4ktokens in Claude Opus 5.5

2.2 %of Claude's 200k window

1.8×the median server

3.5 sto initialize

15 msto list tools

Run it: uvx cpu-perf@0.1.1 (stdio, probed in a container with the network off)
Host: pypi.org
Reports itself as: cpu-perf 0.1.1
Capabilities: completions, prompts, resources, tools
Instructions: 1 798 characters
Of a 1M window: 0.4 % of a 1M context window
Count: 4.4k tokens in Claude Opus 5.5, exact, measured 2026-10-16. With the Claude Code prefix mcp__…__ on each tool name: 4.6k. The o200k_base estimate is 2.6k. Counted again when the tool definitions change. Method.
Repository: https://github.com/usamahz/cpu-performance-engineering
Website: https://github.com/usamahz/cpu-performance-engineering/tree/main/misc/mcp
Registry: active, updated 2026-10-05 · registry entry

Most expensive tools

The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.71×.

Tool	≈ Claude tokens	o200k estimate	Share of this server
ask	776	455	18 %
editorial_record	577	338	13 %
read_source	507	297	11 %
lookup	457	268	10 %
get_benchmark	440	258	10 %

Other registry entries on pypi.org, the ones next to this name; all of them.

Synology NAS search io.github.umayado17/nas-search-mcp · alive
io.github.unempyd/revenueos · crashed on start
io.github.universalamateur/reclaim-mcp-server · alive
Microsoft Access Database io.github.unmateria/msaccess-database · crashed on start
Vaara io.github.vaaraio/vaara · needs args
Vaara MCP Server io.github.vaaraio/vaara-server · needs args
io.github.vaggeliskls/release-notes-mcp · crashed on start
io.github.vandewilly/dice-roller · needs mcp<2

Servers that mention perf.

AdAdvisor MCP Server ai.adadvisor/mcp-server · needs auth
ai.filegraph/document-processing · not found
Iterant ai.iterant/iterant · needs auth
Perfect Memory ai.perfectmemory/perfect-memory · needs auth
Perlucem TBPI — Bank Performance Intelligence ai.perlucem/tbpi · needs auth
ai.perfloop/perfloop · needs auth
Marketing Intelligence & Optimization ai.saifs/marketing-intelligence · needs auth
ai.simplepages/simplepages · needs auth

The result of the latest probe, the tool count and the token cost. The feed has an entry for every probe that changed them.

Stops answering, comes back, tool set or cost changes. One confirmation mail first, a stop link in every mail.