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.
git clone --depth 1 https://github.com/Yesterday-AI/skillsWrote 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/plugins/yesterday-ai/skills/create-shareable-skill)<a href="https://agentmods.dev/plugins/yesterday-ai/skills/create-shareable-skill"><img src="https://agentmods.dev/badge/plugins/yesterday-ai/skills/create-shareable-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/plugins/yesterday-ai/skills/create-shareable-skill"><img src="https://agentmods.dev/badge/plugins/yesterday-ai/skills/create-shareable-skill.svg" alt="Reviewed on agentmods" width="80" height="20"></a>Grade A, and why
create-shareable-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 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.
What it actually says
{
"name": "create-shareable-skill",
"description": "Turn an existing skill or a fresh idea into a catalog-ready shareable skill -- run the quality gate, decide catalog and standalone-vs-bundle placement, pick the category, scaffold SKILL.md (+ optional .plugin.json), update the catalog docs, and open a PR. Use when adding a new skill to the catalog or promoting a personal skill into a shareable one.",
"author": {
"name": "Yesterday"
},
"homepage": "https://github.com/Yesterday-AI/skills/tree/main/.compiled/skill-plugins/create-shareable-skill",
"repository": "https://github.com/Yesterday-AI/skills",
"license": "MIT",
"keywords": [
"claude-code",
"yesterday",
"skill-authoring",
"meta",
"contributing"
]
}
What it installs
The manifest is a name and a version. 1 skill travel with it, and installing the plugin installs all of them — 100 tokens a session between them. Each is measured on its own page, and each can be installed alone.
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.
- 2mo ago Changed · +17 lines 771e3c12e713
- 2mo ago First seen · 1 lines scan A 3ab5ba1f44a9
create-shareable-skill is a plugin published in the GitHub repository Yesterday-AI/skills (2 stars, last pushed 1mo ago), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. 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.
create-shareable-skill compared with plugins from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| create-shareable-skillYesterday-AI/skills | Plugin | 2 | 1mo ago | MIT | A | — | Claude Code |
| before-you-buildwshobson/agents | Plugin | 42k | 4d ago | MIT | A | — | Claude Code |
| handbook-agent-spec-kitNikiforovAll/claude-code-rules | Plugin | 142 | 11d ago | Apache-2.0 | A | — | Claude Code |
| mc-agent-toolkitmonte-carlo-data/mc-agent-toolkit | Plugin | 93 | yesterday | Apache-2.0 | A | — | Cursor |
| pedantic-coderoborchers/fractional-cto | Plugin | 37 | 19d ago | MIT | A | — | Claude Code |
| python-packageoborchers/fractional-cto | Plugin | 37 | 19d ago | MIT | A | — | Claude Code |
| mosaic-bridgeMosaicXR-AI/mosaic-bridge | Plugin | 11 | today | none | A | — | Claude Code |