Borrowing it
Nothing to install: this file belongs to alseif0x/rustycore. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/alseif0x/rustycore/forever/.agents/skills/develop-rustycore/SKILL.mdgit clone --depth 1 https://github.com/alseif0x/rustycoreWrote 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/alseif0x/rustycore/develop-rustycore)<a href="https://agentmods.dev/skills/alseif0x/rustycore/develop-rustycore"><img src="https://agentmods.dev/badge/skills/alseif0x/rustycore/develop-rustycore/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/alseif0x/rustycore/develop-rustycore"><img src="https://agentmods.dev/badge/skills/alseif0x/rustycore/develop-rustycore.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 | $0.00081 | $0.03060 |
| Opus 5.5 | $0.00032 | $0.01224 |
| Sonnet 5.5 | $0.00016 | $0.00612 |
| Haiku 4.5 | $0.00008 | $0.00306 |
Grade A, and why
develop-rustycore 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 5d 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.
The source is not reproduced here
Licensed GPL-3.0
The repository is licensed GPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.
What ships with it
1 file 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.
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.
- 5d ago Changed · +18 lines c724f9686f78
- 1mo ago Changed · +9 lines 442f458e57d3
- 1mo ago First seen · 188 lines · 81 tokens per session scan A df6a51fa940f
develop-rustycore is a skill published in the GitHub repository alseif0x/rustycore (33 stars, last pushed 5d ago), licensed GPL-3.0. It adds 81 tokens to every session and 3,060 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 2026-10-02.
develop-rustycore compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| develop-rustycorealseif0x/rustycore | Skill | 33 | 5d ago | GPL-3.0 | A | 81 | Codex |
| rust-expertRightNow-AI/openfang | Skill | 18k | 4mo ago | Apache-2.0 | A | 22 | Claude Code, Codex |
| wasm-expertRightNow-AI/openfang | Skill | 18k | 4mo ago | Apache-2.0 | A | 22 | Claude Code, Codex |
| axumbobmatnyc/claude-mpm-skills | Skill | 78 | 3mo ago | MIT | A | 34 | Claude Code |
| rustMadAppGang/claude-code | Skill | 287 | 7mo ago | MIT | A | 33 | Claude Code |
| rust-learnswaylq/sijiao-skill | Skill | 20 | 2mo ago | MIT | A | 87 | Claude Code |
| axum-web-frameworkmanutej/luxor-claude-marketplace | Skill | 63 | 4mo ago | none | A | 29 | Claude Code |