io.github.inhuman/mcp-exec

Exec Sandbox

Is the Exec Sandbox MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-29.

Single exec tool running caller Python in a network-isolated locked-down sandbox.

alive probed 2026-11-14 · unchanged since 2026-10-29

1tools

727tokens in Claude Opus 5.5

0.4 %of Claude's 200k window

0.3×the median server

2.8 sto initialize

2 msto list tools

Run it: docker run -i --rm docker.io/idconstruct/mcp-exec:v0.5.4 (stdio, probed in a container with the network off)
Host: docker.io
Reports itself as: mcp-exec v0.5.4
Capabilities: logging, tools
Instructions: none
Of a 1M window: <0.1 % of a 1M context window
Count: 727 tokens in Claude Opus 5.5, exact, measured 2026-10-29. With the Claude Code prefix mcp__…__ on each tool name: 738. The o200k_base estimate is 435. Counted again when the tool definitions change. Method.
Repository: https://github.com/inhuman/mcp-exec
Registry: active, updated 2026-07-20 · registry entry

Most expensive tools

The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.67×.

Tool	≈ Claude tokens	o200k estimate	Share of this server
exec	727	435	100 %

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

io.github.hummingbot/mcp · needs env
io.github.idjohnson/vikunjamcp · alive
Rails Agent Skills io.github.igmarin/rails-agent-skills-mcp · alive
briar io.github.iklobato/briar · alive
Kubernetes Ephemeral Job io.github.inhuman/mcp-k8s-ephemeral-job · crashed on start
io.github.jamesmontemagno/monkeymcp · alive
io.github.jgador/websharp · not probed
io.github.kayembahamid/cybersim-pro · no executable

Servers that mention exec.

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.