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 ComeOnOliver/skillshub --skill axiom-ownership-conventionsgit clone --depth 1 https://github.com/ComeOnOliver/skillshubWrote 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/comeonoliver/skillshub/axiom-ownership-conventions)<a href="https://agentmods.dev/skills/comeonoliver/skillshub/axiom-ownership-conventions"><img src="https://agentmods.dev/badge/skills/comeonoliver/skillshub/axiom-ownership-conventions/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/comeonoliver/skillshub/axiom-ownership-conventions"><img src="https://agentmods.dev/badge/skills/comeonoliver/skillshub/axiom-ownership-conventions.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 | $0.00064 | $0.03291 |
| Opus 5 | $0.00032 | $0.01646 |
| Sonnet 5 | $0.00013 | $0.00658 |
| Haiku 4.5 | $0.00006 | $0.00329 |
Grade A, and why
axiom-ownership-conventions 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 — 457 lines — stays where its author put it; the contents beside it link to each section on GitHub.
borrowing & consuming — Parameter Ownership
Explicit ownership modifiers for performance optimization and noncopyable type support.
When to Use
✅ Use when:
- Large value types being passed read-only (avoid copies)
- Working with noncopyable types (
~Copyable) - Reducing ARC retain/release traffic
- Factory methods that consume builder objects
- Performance-critical code where copies show in profiling
❌ Don't use when:
- Simple types (Int, Bool, small structs)
- Compiler optimization is sufficient (most cases)
- Readability matters more than micro-optimization
- You're not certain about the performance impact
Quick Reference
| Modifier | Ownership | Copies | Use Case |
|---|---|---|---|
| (default) | Compiler chooses | Implicit | Most cases |
borrowing |
Caller keeps | Explicit copy only |
Read-only, large types |
consuming |
Caller transfers | None needed | Final use, factories |
inout |
Caller keeps, mutable | None | Modify in place |
Default Behavior by Context
| Context | Default | Reason |
|---|---|---|
| Function parameters | borrowing |
Most params are read-only |
| Initializer parameters | consuming |
Usually stored in properties |
| Property setters | consuming |
Value is stored |
Method self |
borrowing |
Methods read self |
Patterns
Pattern 1: Read-Only Large Struct
struct LargeBuffer {
var data: [UInt8] // Could be megabytes
}
// ❌ Default may copy
func process(_ buffer: LargeBuffer) -> Int {
buffer.data.count
}
// ✅ Explicit borrow — no copy
func process(_ buffer: borrowing LargeBuffer) -> Int {
buffer.data.count
}
Pattern 2: Consuming Factory
struct Builder {
var config: Configuration
// Consumes self — builder invalid after call
consuming func build() -> Product {
Product(config: config)
}
}
let builder = Builder(config: .default)
let product = builder.build()
// builder is now invalid — compiler error if used
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 · 457 lines · 64 tokens per session scan A 1f2f97dd71f4
axiom-ownership-conventions is a skill published in the GitHub repository ComeOnOliver/skillshub (63 stars, last pushed 2mo ago), licensed MIT. It adds 64 tokens to every session and 3,291 once invoked, about $0.0003 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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