An interactive walkthrough of a project plan that explains its reasoning, data choices, and component decisions. It is designed to summarize a plan in about one or two minutes before or after implementation.

It is for briefing someone on the latest or selected plan, including what will happen, what was completed, and why the decisions were made.

It helps developers understand why a plan is shaped a certain way without having to read the entire plan and supporting documents first.

brief — Skill for Claude Code by oliver-kriska

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.

Any agent

npx skills add oliver-kriska/claude-elixir-phoenix --skill brief

Clone the repo

git clone --depth 1 https://github.com/oliver-kriska/claude-elixir-phoenix

Made for: Claude Code.

Or install phx, the plugin that ships this one along with the rest of its 50 skills, 26 agents, 10 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/oliver-kriska/claude-elixir-phoenix/brief/github.svg)](https://agentmods.dev/skills/oliver-kriska/claude-elixir-phoenix/brief)

Your own site

<a href="https://agentmods.dev/skills/oliver-kriska/claude-elixir-phoenix/brief"><img src="https://agentmods.dev/badge/skills/oliver-kriska/claude-elixir-phoenix/brief/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/oliver-kriska/claude-elixir-phoenix/brief"><img src="https://agentmods.dev/badge/skills/oliver-kriska/claude-elixir-phoenix/brief.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 29 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,192 The whole file, excluding the scripts and references it only reads on demand.

Security scan B 1 finding. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector warn 7 Sept 2026

SkillSpector: 1 finding, up to high

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

high Agent Snooping · line 45
Skill reads from agent configuration directories (.claude/, .codex/, .gemini/). These directories may contain API keys, personal settings, and other credentials that the skill has no legitimate need to access.

Fix: Remove all code or instructions that access agent configuration directories (.claude/, .codex/, .gemini/). If configuration values are needed, pass them explicitly as parameters or environment variabl

How audits are shown

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.

Model	Per session	Once invoked
Fable 5.1	$0.00029	$0.01192
Opus 5	$0.00015	$0.00596
Sonnet 5	$0.00006	$0.00238
Haiku 4.5	$0.00003	$0.00119

Measured 9d ago against content hash 1fd47fcb8c7e, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade B, and why

brief scanned grade B with 1 finding 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 9d 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.

Reads agent configuration directoriesmediumAgent snooping

.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.

Use Glob to find `.claude/plans/*/plan.md` and pick the most recent.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

phx-brief — 86% identical, 27 lines differ

plugins/elixir-phoenix/skills/brief/SKILL.md · 148 lines

How it starts

The opening of the file, as written. The whole thing — 148 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Plan Briefing

Interactive walkthrough of a plan's reasoning, decisions, and solution shape. Designed for developers who need to understand a plan in 1-2 minutes instead of reading the full document.

Why This Exists

Plans answer "what to do" but bury "why." This skill bridges that gap with an interactive walkthrough.

Usage

/phx:brief                                    # Latest plan
/phx:brief .claude/plans/user-auth/plan.md    # Specific plan

Arguments

$ARGUMENTS = Path to plan file (optional, auto-detects latest)

Mode Detection

Read the plan file and determine mode from phase statuses:

All phases [PENDING] = Pre-work briefing (what WILL happen)
Any phase [COMPLETED] or [IN_PROGRESS] = Post-work briefing (what WAS done and why)

Execution Flow

Step 1: Locate and Load Plan

If $ARGUMENTS has a path, use it
Otherwise, find latest plan:

Use Glob to find .claude/plans/*/plan.md and pick the most recent.
If no plan found, tell user and suggest /phx:plan
Read the plan file

Step 2: Load Supporting Artifacts

Read what's available (don't fail if missing):

.claude/plans/{slug}/summaries/consolidated.md (research summary)
.claude/plans/{slug}/scratchpad.md (decisions, dead-ends)
.claude/plans/{slug}/progress.md (work log, post-work only)

Step 3: Present Briefing Sections

Present ONE section at a time, wrapped in the visual briefing block (see ${CLAUDE_SKILL_DIR}/references/briefing-guide.md Visual Formatting).

The section MUST be emitted as visible response text BEFORE the AskUserQuestion call. Content composed only in thinking/reasoning is invisible to the user, and the question field is too short to carry it. If the user would see only a "Continue?" dialog, the section was never shown. Write the ★ Briefing block as normal output first, then ask:

If sections remain: question "Continue the briefing?" with options "Next: {title}", "Ask me a question about this", "Stop here"
If final section: no question needed, show closing message

Read the full file on GitHub · 148 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.

9d ago First seen · 148 lines · 29 tokens per session scan B 1fd47fcb8c7e

Subscribe to this mod's changes

brief is a skill published in the GitHub repository oliver-kriska/claude-elixir-phoenix (541 stars, last pushed 3d ago), licensed MIT. It adds 29 tokens to every session and 1,192 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it B with 1 finding (reads agent configuration directories). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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