io.github.parisbs/codex-subagent-mcp

Codex Subagent

Is the Codex Subagent MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-27.

Delegate coding tasks to the OpenAI Codex CLI, installed separately, with explicit model and effort.

alive probed 2026-11-14 · unchanged since 2026-10-27

9tools

4.2ktokens in Claude Opus 5.5

2.1 %of Claude's 200k window

1.7×the median server

412 msto initialize

14 msto list tools

Run it: npx -y codex-subagent-mcp@0.6.0 (stdio, probed in a container with the network off)
Host: npmjs.com
Reports itself as: codex-subagent 0.6.0
Capabilities: logging, tools
Instructions: 287 characters
Of a 1M window: 0.4 % of a 1M context window
Count: 4.2k tokens in Claude Opus 5.5, exact, measured 2026-10-28. With the Claude Code prefix mcp__…__ on each tool name: 4.3k. The o200k_base estimate is 2.5k. Counted again when the tool definitions change. Method.
Repository: https://github.com/parisbs/codex-subagent-mcp
Website: https://github.com/parisbs/codex-subagent-mcp#readme
Registry: active, updated 2026-10-21 · registry entry
Changes: 2 recorded, reachable in 2 of them. A row is added when the result, the tool count or the cost changes.

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
codex_delegate	1 651	965	39 %
codex_follow_up	886	518	21 %
codex_doctor	378	221	9 %
codex_usage	315	184	7 %
codex_recommend	287	168	7 %

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

paprika3d (the three.js toolset for coding agents) io.github.paprika3d/paprika3d · alive
Polymation io.github.paradoxsyn/rivemcp · crashed on start
io.github.parallelromb/smara · alive
io.github.pareen/monad-mcp · alive
Dark Search Protocol io.github.parnasheps-eng/dark-search-protocol · alive
Parseable io.github.parseablehq/parseable-mcp-server · crashed on start
ParseRelay io.github.parserelay/mcp · alive
io.github.parthsevak2/curb-cut-mcp · crashed on start

Servers that mention subagent.

We add a row when the result changes. A server with no change keeps its last row.

Probed	Result	Init	Tools	Claude	o200k
2026-10-27 06:58	alive	313 ms	9		2.5k
2026-10-20 06:44	alive	412 ms	8		2.1k

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.