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.
npx skills add heyAyushh/stacc --skill ownershipgit clone --depth 1 https://github.com/heyAyushh/staccWrote 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.
[](https://agentmods.dev/skills/heyayushh/stacc/ownership)<a href="https://agentmods.dev/skills/heyayushh/stacc/ownership"><img src="https://agentmods.dev/badge/skills/heyayushh/stacc/ownership/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.
<a href="https://agentmods.dev/skills/heyayushh/stacc/ownership"><img src="https://agentmods.dev/badge/skills/heyayushh/stacc/ownership.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00044 | $0.00795 |
| Opus 5 | $0.00022 | $0.00398 |
| Sonnet 5 | $0.00009 | $0.00159 |
| Haiku 4.5 | $0.00004 | $0.00080 |
Grade A, and why
rust-ownership 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 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.
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.
How it starts
The opening of the file, as written. The whole thing — 98 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Ownership & Lifetimes
Layer 1: Language Mechanics
Core Question
Who should own this data, and for how long?
Before fixing ownership errors, understand the data's role:
- Is it shared or exclusive?
- Is it short-lived or long-lived?
- Is it transformed or just read?
Error → Design Question
| Error | Don't Just Say | Ask Instead |
|---|---|---|
| E0382 | "Clone it" | Who should own this data? |
| E0597 | "Extend lifetime" | Is the scope boundary correct? |
| E0506 | "End borrow first" | Should mutation happen elsewhere? |
| E0507 | "Clone before move" | Why are we moving from a reference? |
| E0515 | "Return owned" | Should caller own the data? |
| E0716 | "Bind to variable" | Why is this temporary? |
| E0106 | "Add 'a" | What is the actual lifetime relationship? |
Thinking Prompt
Before fixing an ownership error, ask:
-
What is this data's domain role?
- Entity (unique identity) → owned
- Value Object (interchangeable) → clone/copy OK
- Temporary (computation result) → maybe restructure
-
Is the ownership design intentional?
- By design → work within constraints
- Accidental → consider redesign
-
Fix symptom or redesign?
- If Strike 3 (3rd attempt) → escalate to design layer
Quick Reference
| Pattern | Ownership | Cost | Use When |
|---|---|---|---|
| Move | Transfer | Zero | Caller doesn't need data |
&T |
Borrow | Zero | Read-only access |
&mut T |
Exclusive borrow | Zero | Need to modify |
clone() |
Duplicate | Alloc + copy | Actually need a copy |
Rc<T> |
Shared (single) | Ref count | Single-thread sharing |
Arc<T> |
Shared (multi) | Atomic ref count | Multi-thread sharing |
Cow<T> |
Clone-on-write | Alloc if mutated | Might modify |
Error Code Reference
| Error | Cause | Fix |
|---|---|---|
| E0382 | Value moved | Clone, reference, or redesign ownership |
| E0597 | Reference outlives owner | Extend owner scope or restructure |
| E0506 | Assign while borrowed | End borrow before mutation |
| E0507 | Move out of borrowed | Clone or use reference |
| E0515 | Return local reference | Return owned value |
| E0716 | Temporary dropped | Bind to variable |
| E0106 | Missing lifetime | Add 'a annotation |
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 · 98 lines · 44 tokens per session scan A 13a5b098e5b2
rust-ownership is a skill published in the GitHub repository heyAyushh/stacc (3 stars, last pushed 2mo ago), licensed MIT. It adds 44 tokens to every session and 795 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 2026-09-03.
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