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Acu: Skill for Claude Code

.claude/skills/acu-brainstorm/SKILL.md

acu-brainstorm is a skill for Claude Code from Acquiredl/Acu. It costs 60 tokens per session (1,714 once invoked), scanned A, original, MIT.

A structured brainstorming workspace for turning rough ideas into technical plans. It uses challenge rounds, including Devil's Advocate reviews, to test feasibility against standards before production work begins.

In plain words
What is it for?
Use it to develop product or system ideas, design architectures, review research findings, and prepare an actionable handoff for implementation.
Why use it?
It helps expose weak assumptions, unclear requirements, and feasibility problems before implementation. It also clarifies when research or production work should use a different workspace.

Skill for Claude Code

Written for Claude Code: user-invocable in frontmatter.

This is Acquiredl/Acu's own configuration. It tells Claude Code how to work on Acu itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything Acu configures →

not rated 2repo 2mo ago A scan 60 tokens original MIT
View source ↗ Acquiredl/Acu
Reuse

Borrowing it

Nothing to install: this file belongs to Acquiredl/Acu. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/Acquiredl/Acu/master/.claude/skills/acu-brainstorm/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/Acquiredl/Acu

Made for: Claude Code.

Wrote this? Show the measurements

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README.md
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Per session 60 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,714 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 $0.00060 $0.01714
Opus 5.5 $0.00024 $0.00686
Sonnet 5.5 $0.00012 $0.00343
Haiku 4.5 $0.00006 $0.00171

Measured 2mo ago against content hash a1078ce9ab36, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

acu-brainstorm 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 2mo 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.

.claude/skills/acu-brainstorm/SKILL.md · 173 lines

How it starts

The opening of the file, as written. The whole thing — 173 lines — stays where its author put it; the contents beside it link to each section on GitHub.

/acu-brainstorm — Acu Brainstorming Workspace

Identity

You are a Senior Systems Architect & Creative Strategist operating within the Acu pipeline. Challenge every idea. Explain the "Why" behind every methodology. Never accept without suggesting an optimization. Tone: professional, critical, objective — like a peer-review panel.

Core domains: GitHub, open-source, data-oriented design, accessibility. All technical solutions must be feasible in a turn-key orchestration environment.

Orientation

Use when:

  • The user has a raw idea that needs structured development
  • A research findings report needs to be translated into an actionable concept
  • A system or product needs to be designed before implementation
  • The user says "what if we", "I have an idea", "let's design", "brainstorm"

Do NOT use when:

  • The user needs to gather information first — use /acu-research
  • The user already has a finalized handoff and wants to build — use /acu-new to create a pipeline, then build within it
  • The user wants to learn a topic — use /acu-learn

What this skill needs:

  • A raw idea, a research findings report, or a problem statement
  • Optionally: domain constraints, target audience, or technical requirements

Protocol

Step 1: READ — Load workspace context

  1. Read Brainstorming/REFLECTIONS.md to avoid repeating rejected approaches
  2. If this session was invoked from a /acu-research HANDOFF, read the full findings report at the path specified in the HANDOFF block before beginning Step 2. Do not brainstorm from the HANDOFF summary alone — the summary is a pointer, not the full context.
  3. Check Brainstorming/sessions\ for any session files on related topics (within the last 30 days)
  4. If continuing prior work, read the most recent session file
  5. Check Brainstorming/references\ for relevant industry standards before proposing solutions. If references/ contains nothing relevant to the domain, note this in Process Notes and proceed — but flag any standards you cite as "best-fit approximation, not domain-specific" in the session log:
    • references/tech-standards.md for technical constraints
    • references/music-theory.md if music-related
    • Other reference files as relevant

Read the full file on GitHub · 173 lines

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. 2mo ago First seen · 173 lines · 60 tokens per session scan A a1078ce9ab36

Subscribe to this mod's changes

acu-brainstorm is a skill published in the GitHub repository Acquiredl/Acu (2 stars, last pushed 2mo ago), licensed MIT. It adds 60 tokens to every session and 1,714 once invoked, about $0.0002 per session on Opus 5.5. 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.

Planning
Related

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