io.github.mrfentmen/hexdump-mcp

hexdump-mcp

Is the io.github.mrfentmen/hexdump-mcp MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-29.

Classic hex dumps and byte stats offline: dump text, hex or base64 and convert between them

alive probed 2026-11-15 · unchanged since 2026-10-29

3tools

664tokens in Claude Opus 5.5

0.3 %of Claude's 200k window

0.3×the median server

242 msto initialize

10 msto list tools

Run it: npx -y @mrfentmen/hexdump-mcp@1.0.1 (stdio, probed in a container with the network off)
Host: npmjs.com
Reports itself as: hexdump-mcp 1.0.0
Capabilities: tools
Instructions: none
Of a 1M window: <0.1 % of a 1M context window
Count: 664 tokens in Claude Opus 5.5, exact, measured 2026-10-29. With the Claude Code prefix mcp__…__ on each tool name: 703. The o200k_base estimate is 379. Counted again when the tool definitions change. Method.
Repository: https://github.com/mrfentmen/awesome-servers
Registry: active, updated 2026-10-28 · registry entry

Most expensive tools

The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.75×.

Tool	≈ Claude tokens	o200k estimate	Share of this server
hex_dump	270	154	41 %
convert_bytes	212	121	32 %
byte_stats	182	104	27 %

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

Servers that mention between or classic.

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.