io.github.OpenTrain-AI/opentrain

OpenTrain

Is the OpenTrain MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-31.

Hire human data labelers, RLHF annotators, and evaluators from your coding agent.

alive probed 2026-11-14 · unchanged since 2026-10-31

41tools

12ktokens in Claude Opus 5.5

5.9 %of Claude's 200k window

4.7×the median server

214 msto initialize

40 msto list tools

Run it: npx -y @opentrain-ai/mcp@0.2.2 (stdio, probed in a container with the network off)
Host: npmjs.com
Reports itself as: opentrain 0.2.2
Capabilities: tools
Instructions: none
Of a 1M window: 1.2 % of a 1M context window
Count: 12k tokens in Claude Opus 5.5, exact, measured 2026-10-17. With the Claude Code prefix mcp__…__ on each tool name: 12k. The o200k_base estimate is 6.7k. Counted again when the tool definitions change. Method.
Repository: https://github.com/OpenTrain-AI/OpenTrain-Platform-Monorepo
Website: https://www.opentrain.ai/docs/developers/overview
Registry: active, updated 2026-06-15 · registry entry

Most expensive tools

The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.77×.

Tool	≈ Claude tokens	o200k estimate	Share of this server
opentrain_hire_proposal	773	436	7 %
opentrain_create_job_draft	594	335	5 %
opentrain_update_job_draft_fields	441	249	4 %
opentrain_create_milestone	438	247	4 %
opentrain_read_messages	413	233	3 %

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

Servers that mention annotators or evaluators.

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.