auv: Skill for Claude Code

.agents/skills/m02-resource/SKILL.md

m02-resource is a skill for Claude Code from moeru-ai/auv. It costs 74 tokens per session (1,087 once invoked), scanned A, original, Apache-2.0.

Guidance for managing ownership and shared access to data in Rust, including smart pointers such as Box, Rc, Arc, Weak, RefCell, and Cell. Rust uses ownership rules to control when memory can be used and released.

In plain words
What is it for?
Use it when deciding between single and shared ownership, stack and heap storage, single- and multi-threaded access, or when handling reference-counted data and possible cycles.
Why use it?
It helps choose a suitable way to store or share data instead of picking a pointer type only to silence a compiler error. It also addresses thread safety, reference cycles, and runtime borrowing failures.

Skill for Claude Code

Written for Claude Code: user-invocable in frontmatter. Also seen: installed under .agents/ (shared by several agents).

This is moeru-ai/auv's own configuration. It tells Claude Code how to work on auv 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 auv configures →

Reuse

Borrowing it

Nothing to install: this file belongs to moeru-ai/auv. 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/moeru-ai/auv/main/.agents/skills/m02-resource/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/moeru-ai/auv

Made for: Claude Code.

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 m02-resource

README.md
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Your own site
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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.

agentmods 80×15 button for m02-resource

Your own site · 80×15
<a href="https://agentmods.dev/skills/moeru-ai/auv/m02-resource"><img src="https://agentmods.dev/badge/skills/moeru-ai/auv/m02-resource.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 74 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,087 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. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00074 $0.01087
Opus 5.5 $0.00030 $0.00435
Sonnet 5.5 $0.00015 $0.00217
Haiku 4.5 $0.00007 $0.00109

Measured 2mo ago against content hash 00e54bc7e81d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

m02-resource 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.

.agents/skills/m02-resource/SKILL.md · 160 lines

How it starts

The opening of the file, as written. The whole thing — 160 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Resource Management

Layer 1: Language Mechanics

Core Question

What ownership pattern does this resource need?

Before choosing a smart pointer, understand:

  • Is ownership single or shared?
  • Is access single-threaded or multi-threaded?
  • Are there potential cycles?

Error → Design Question

Error Don't Just Say Ask Instead
"Need heap allocation" "Use Box" Why can't this be on stack?
Rc memory leak "Use Weak" Is the cycle necessary in design?
RefCell panic "Use try_borrow" Is runtime check the right approach?
Arc overhead complaint "Accept it" Is multi-thread access actually needed?

Thinking Prompt

Before choosing a smart pointer:

  1. What's the ownership model?

    • Single owner → Box or owned value
    • Shared ownership → Rc/Arc
    • Weak reference → Weak
  2. What's the thread context?

    • Single-thread → Rc, Cell, RefCell
    • Multi-thread → Arc, Mutex, RwLock
  3. Are there cycles?

    • Yes → One direction must be Weak
    • No → Regular Rc/Arc is fine

Trace Up ↑

When pointer choice is unclear, trace to design:

"Should I use Arc or Rc?"
    ↑ Ask: Is this data shared across threads?
    ↑ Check: m07-concurrency (thread model)
    ↑ Check: domain-* (performance constraints)
Situation Trace To Question
Rc vs Arc confusion m07-concurrency What's the concurrency model?
RefCell panics m03-mutability Is interior mutability right here?
Memory leaks m12-lifecycle Where should cleanup happen?

Trace Down ↓

From design to implementation:

"Need single-owner heap data"
    ↓ Use: Box<T>

"Need shared immutable data (single-thread)"
    ↓ Use: Rc<T>

"Need shared immutable data (multi-thread)"
    ↓ Use: Arc<T>

"Need to break reference cycle"
    ↓ Use: Weak<T>

"Need shared mutable data"
    ↓ Single-thread: Rc<RefCell<T>>
    ↓ Multi-thread: Arc<Mutex<T>> or Arc<RwLock<T>>

Read the full file on GitHub · 160 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 · 160 lines · 74 tokens per session scan A 00e54bc7e81d

Subscribe to this mod's changes

m02-resource is a skill published in the GitHub repository moeru-ai/auv (203 stars, last pushed 2d ago), licensed Apache-2.0. It adds 74 tokens to every session and 1,087 once invoked, about $0.0003 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 2026-08-30.

Related

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