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 Yasuui/ystack --skill copy-skillgit clone --depth 1 https://github.com/Yasuui/ystackWrote 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/yasuui/ystack/copy-skill)<a href="https://agentmods.dev/skills/yasuui/ystack/copy-skill"><img src="https://agentmods.dev/badge/skills/yasuui/ystack/copy-skill/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/yasuui/ystack/copy-skill"><img src="https://agentmods.dev/badge/skills/yasuui/ystack/copy-skill.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 | $0.00072 | $0.01915 |
| Opus 5.5 | $0.00029 | $0.00766 |
| Sonnet 5.5 | $0.00014 | $0.00383 |
| Haiku 4.5 | $0.00007 | $0.00192 |
Grade A, and why
copy-skill 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 1mo 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 — 202 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Copy Skill
The Fundamental Rule
Specificity beats adjectives. Every time.
"A powerful new tool for developers" is zero information. "Runs 7 agents in parallel on Gemini free tier" is a claim, a number, and a product detail in 8 words.
The test: can a competitor make the exact same claim without lying? If yes, rewrite it.
Voice: Yonis / Standard Bio.
This is not a corporate voice. It is a founder voice. Specific rules:
- First person or no person. No "we" (unless it's genuinely collaborative). "I built this" or "Built this" — not "We are excited to announce."
- Short declarative sentences. Not complex clauses. The period is powerful.
- Numbers when they exist. "40% faster" beats "significantly faster."
- No hedging. "This might help some developers who are looking for..." — never. "Solves X for Y" — always.
- Canadian, Toronto, indie, open source — these are identity markers. Use them when relevant.
- Technical terms are not jargon when the audience is technical. Do not dumb it down.
Platform Copy
X Posts (standalone — not thread)
Structure: one hook, one proof, one action or implication. Maximum 240 characters for the main post.
Hook patterns that work:
[Specific number or fact]: [implication]
"7 agents running in parallel. All on Gemini free tier."
[What I built] — [why it matters in one clause]
"Built a free alternative to gstack. Open source."
[The thing that surprised me] — [why]
"Plaid's Canadian coverage is actually solid. 90%+ of institutions."
[Before / after in two lines]
"Before: constant Gemini confirmations, $20/mo minimum
After: walk away and come back to a finished PR"
What to ban:
- Starting with "I'm thrilled/excited/proud to share..."
- "Game changer for..." (banned phrase)
- Rhetorical questions as hooks ("Have you ever wondered why...?") — weak
- Emoji as the first character — signals low signal-to-noise
- Thread-baiting ("here's what I learned 🧵") — earned by content, not promised
- Using the word "Just" to minimize your own work: "Just shipped a small thing..."
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.
- 1mo ago First seen · 202 lines · 72 tokens per session scan A 39aa00c998d5
copy-skill is a skill published in the GitHub repository Yasuui/ystack (1 stars, last pushed 23d ago), licensed MIT. It adds 72 tokens to every session and 1,915 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 2026-08-31.
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