io.github.0xmortuex/gdbstub-mcp

gdbstub

Is the io.github.0xmortuex/gdbstub-mcp MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-30.

Debug kernels through QEMU's gdbstub with no gdb binary - and explain triple faults.

alive probed 2026-11-15 · unchanged since 2026-10-30

18tools

4.0ktokens in Claude Opus 5.5

2.0 %of Claude's 200k window

1.6×the median server

2.3 sto initialize

5 msto list tools

Run it: uvx gdbstub-mcp@0.1.0 (stdio, probed in a container with the network off)
Host: pypi.org
Reports itself as: gdbstub
Capabilities: prompts, resources, tools
Instructions: 547 characters
Of a 1M window: 0.4 % of a 1M context window
Count: 4.0k tokens in Claude Opus 5.5, exact, measured 2026-10-16. With the Claude Code prefix mcp__…__ on each tool name: 4.2k. The o200k_base estimate is 2.2k. Counted again when the tool definitions change. Method.
Repository: https://github.com/0xmortuex/gdbstub-mcp
Registry: active, updated 2026-10-11 · registry entry

Most expensive tools

The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.78×.

Tool	≈ Claude tokens	o200k estimate	Share of this server
debug_connect	558	314	14 %
debug_explain_fault	359	202	9 %
debug_break	327	184	8 %
debug_memory	318	179	8 %
debug_registers	311	175	8 %

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

Servers that mention explain or kernels.

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.