rb:brief

rb:brief is a skill for Claude Code, Codex from slbug/claude-ruby-grape-rails. It costs 42 tokens per session (1,473 once invoked), scanned A, original, MIT.

A concise explanation tool for Ruby, Rails, and Grape plans, code changes, or reviews.

In plain words
What is it for?
It is for briefing developers on modified files, new components, dependencies, configuration changes, review concerns, and follow-up steps.
Why use it?
It turns lengthy technical work into a short summary of what changed, risks, and the next action.

Skill for Claude CodeCodex

Part of the ruby-grape-rails plugin — 23 skills, 19 agents, 17 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 skills/slbug/claude-ruby-grape-rails/brief
Any agent
npx skills add slbug/claude-ruby-grape-rails --skill brief
Clone the repo
git clone --depth 1 https://github.com/slbug/claude-ruby-grape-rails

Made for: Claude Code, Codex.

Or install ruby-grape-rails, the plugin that ships this one along with the rest of its 23 skills, 19 agents, 17 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 rb:brief

README.md
[![agentmods](https://agentmods.dev/badge/skills/slbug/claude-ruby-grape-rails/brief.svg)](https://agentmods.dev/skills/slbug/claude-ruby-grape-rails/brief)
Your own site
<a href="https://agentmods.dev/skills/slbug/claude-ruby-grape-rails/brief"><img src="https://agentmods.dev/badge/skills/slbug/claude-ruby-grape-rails/brief.svg" alt="Measured on agentmods" height="20"></a>
Per session 42 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,473 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 $0.00042 $0.01473
Opus 5 $0.00021 $0.00737
Sonnet 5 $0.00008 $0.00295
Haiku 4.5 $0.00004 $0.00147

Measured 4d ago against content hash 64869f18cb2b, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

rb:brief 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 4d 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/ruby-grape-rails/skills/brief/SKILL.md · 271 lines

How it starts

The opening of the file, as written. The whole thing — 271 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Brief the Work

Read the supplied artifact, then explain what matters in a concise summary.

Purpose

Briefs provide high-signal explanations for busy developers. After planning, working, or reviewing, use /rb:brief to understand:

  • What's happening
  • What matters most
  • What to do next

Brief Process

START ──▶ READ ARTIFACT(S) ──▶ EXTRACT SIGNAL ──▶ SYNTHESIZE
                                                │
                                                ▼
                                         STRUCTURE BRIEF
                                                │
                                                ▼
                                              OUTPUT

Brief Structure

1. One-Line Summary

The goal in 10-15 words.

2. The Moving Parts (3-5 bullets)

What changed or will change:

  • Files modified/created
  • New components
  • Dependencies added
  • Configuration changes

3. Risk Areas

What could go wrong:

  • Breaking changes
  • Security implications
  • Performance concerns
  • Deployment risks

4. Next Action

What to do now:

  • Start implementation
  • Address review findings
  • Run specific commands
  • Make decisions

Brief by Artifact Type

Briefing a Plan

Read: plan.md

Extract:

  • Goal from overview
  • Phases and task count
  • Risk areas from risk table
  • Recommended next step

Format:

## Plan Brief: {Feature Name}

**Goal**: {one line}

**Scope**: {N} tasks across {N} phases
- Phase 1: {summary}
- Phase 2: {summary}
...

**Key Risks**:
- {risk} ({severity})
- {risk} ({severity})

**Next Step**: {action}

Briefing Work Results

Read: plan.md (updated), changed files

Extract:

  • What was completed
  • What was blocked
  • Files that changed
  • Verification results

Format:

## Work Brief: {Feature Name}

**Completed**: {N}/{N} tasks

**Changes**:
- Created: {files}
- Modified: {files}
- Deleted: {files}

**Blockers**: {N}
- {blocker description}

**Verification**: {status}
- Tests: {pass/fail}
- Linter: {clean/issues}

**Next Step**: {action}

Read the full file on GitHub · 271 lines

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 4d ago First seen · 271 lines · 42 tokens per session scan A 64869f18cb2b

Subscribe to this mod's changes

rb:brief is a skill published in the GitHub repository slbug/claude-ruby-grape-rails (7 stars, last pushed 4d ago), licensed MIT. It adds 42 tokens to every session and 1,473 once invoked, about $0.0002 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 2026-08-31.