check

check is a command for coding agents from xai-org/grok-build-plugin-cc. It costs 15 tokens per session (191 once invoked), scanned A, original, Apache-2.0.

A command that checks whether the local Grok Build command-line tool is installed and ready for use from Claude Code. It also reports when authentication is needed.

In plain words
What is it for?
Verifying that Grok is on the system path, checking authentication, and showing the next setup step when it is unavailable.
Why use it?
It identifies setup problems before delegated Grok tasks are attempted.

Command

Installs and runs on its own, but its text points at files inside its plugin — anything it tells you to read at a ${CLAUDE_PLUGIN_ROOT} path is only there once the plugin is installed. Installing the plugin gets both.

Part of the grok-build plugin — 2 skills, 8 commands, 1 agent, 2 hooks shipped together

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add commands/xai-org/grok-build-plugin-cc/check
Clone the repo
git clone --depth 1 https://github.com/xai-org/grok-build-plugin-cc

Or install grok-build, the plugin that ships this one along with the rest of its 2 skills, 8 commands, 1 agent, 2 hooks.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for check

README.md
[![agentmods](https://agentmods.dev/badge/commands/xai-org/grok-build-plugin-cc/check.svg)](https://agentmods.dev/commands/xai-org/grok-build-plugin-cc/check)
Your own site
<a href="https://agentmods.dev/commands/xai-org/grok-build-plugin-cc/check"><img src="https://agentmods.dev/badge/commands/xai-org/grok-build-plugin-cc/check.svg" alt="Measured on agentmods" height="20"></a>
Per session 15 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 191 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00015 $0.00191
Opus 5 $0.00008 $0.00096
Sonnet 5 $0.00003 $0.00038
Haiku 4.5 $0.00002 $0.00019

Measured 5d ago against content hash 91e1c0d70000, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

check scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/grok-build/commands/check.md · 23 lines

What it actually says

Run:

node "${CLAUDE_PLUGIN_ROOT}/scripts/grok-bridge.mjs" check --json $ARGUMENTS

If the result says Grok is unavailable:

  • Do not invent an install path. Tell the user to install the Grok Build CLI and ensure grok is on PATH (or set GROK_BINARY).
  • Then rerun /grok-build:check after they install it.

If Grok is already installed:

  • Do not ask about installation.

Output rules:

  • Present the final check output to the user.
  • If Grok is installed but not authenticated, preserve the guidance to authenticate (for example complete login via interactive grok, then verify with grok models).
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 5d ago First seen · 23 lines · 15 tokens per session scan A 91e1c0d70000

Subscribe to this mod's changes

check is a command published in the GitHub repository xai-org/grok-build-plugin-cc (240 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 15 tokens to every session and 191 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.