io.github.Metricall-AI-Lab/groundrule

Groundrule

Is the Groundrule MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-30.

Your repository's engineering standards for coding agents: rules per file, CI check, rule proposals.

alive probed 2026-11-14 · unchanged since 2026-10-30

4tools

1.1ktokens in Claude Opus 5.5

0.5 %of Claude's 200k window

0.4×the median server

399 msto initialize

3 msto list tools

Run it: npx -y @groundrule/cli@0.23.1 (stdio, probed in a container with the network off)
Host: npmjs.com
Reports itself as: groundrule 0.23.1
Capabilities: tools
Instructions: 678 characters
Of a 1M window: 0.1 % of a 1M context window
Count: 1.1k tokens in Claude Opus 5.5, exact, measured 2026-10-30. With the Claude Code prefix mcp__…__ on each tool name: 1.1k. The o200k_base estimate is 662. Counted again when the tool definitions change. Method.
Repository: https://github.com/Metricall-AI-Lab/groundrule-oss
Website: https://docs.groundrule.dev/developers/agents/mcp/
Registry: active, updated 2026-10-29 · registry entry

Most expensive tools

The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.63×.

Tool	≈ Claude tokens	o200k estimate	Share of this server
propose_rule	408	250	38 %
check	277	170	26 %
rules_for	210	129	19 %
list_standards	184	113	17 %

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

Servers that mention groundrule or engineering or repository.

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.