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/marketplace)<a href="https://agentmods.dev/plugins/yesterday-ai/skills/marketplace"><img src="https://agentmods.dev/badge/plugins/yesterday-ai/skills/marketplace.svg" alt="Measured on agentmods" height="20"></a>Grade A, and why
yesterday-public-plugins marketplace 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 yesterday.
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 — 320 lines — stays where its author put it; the contents beside it link to each section on GitHub.
{
"name": "yesterday-public-plugins",
"description": "Yesterday's PUBLIC plugin catalog.",
"owner": {
"name": "Yesterday"
},
"allowCrossMarketplaceDependenciesOn": [
"claude-plugins-official"
],
"plugins": [
{
"name": "ytstack",
"description": "BUNDLE: Yesterday Technologies Stack -- opinionated software-development OS for AI agents. Curated superpowers + gstack skills plus Project-OS artifact discipline (PROJECT.md, DECISIONS.md, KNOWLEDGE.md, milestone/slice/task hierarchy), orchestrated via SessionStart hooks.",
"source": {
"source": "github",
"repo": "Yesterday-AI/ytstack"
},
"author": {
"name": "Yesterday"
},
"homepage": "https://github.com/Yesterday-AI/ytstack",
"repository": "https://github.com/Yesterday-AI/ytstack",
"license": "MIT",
"keywords": [
"claude-code",
"agentic",
"development-methodology",
"project-management",
"artifact-discipline",
"yesterday"
]
},
{
"name": "office",
"description": "BUNDLE: Daily-work core tier. Generic productivity, creative, and knowledge skills for daily work; nothing requires external SaaS keys at install time. Optional SaaS integrations (Figma, Miro, Voxtral TTS, VRR transit) live in office-extras.",
"source": "./plugins/office",
"author": {
"name": "Yesterday"
},
"keywords": [
"claude-code",
"yesterday",
"productivity",
"daily-work",
"knowledge-management",
"creative"
]
},
{
"name": "office-extras",
"description": "BUNDLE: Daily-work extras tier. Optional integrations needing external SaaS accounts/keys (Figma, Miro, Voxtral TTS, VRR transit). Install alongside office when you actually use these services.",
"source": "./plugins/office-extras",
"author": {
"name": "Yesterday"
},
"keywords": [
"claudeThe plugins it lists here
This marketplace lists 15 plugins kept in the same repository. Each has its own page, its own measurements and its own install command.
- Plugin create-shareable-skill 1 inside A not measured
- Plugin office 5 inside A not measured
- Plugin creative-productivity 1 inside A not measured
- Plugin excalidraw-diagram 1 inside A not measured
- Plugin figma-console-mcp 1 inside A not measured
- Plugin paperclip-api 1 inside A not measured
- Plugin para-memory-files 1 inside A not measured
- Plugin voxtral-tts-api 1 inside A not measured
- Plugin vrr-efa-api 1 inside A not measured
- Plugin web-design 1 inside A not measured
- Plugin wrapup 1 inside A not measured
- Plugin miro-board 1 inside A not measured
- Plugin personal-agent 14 inside A not measured
- Plugin systems-operations 3 inside A not measured
- Plugin webflow 2 inside A not measured
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.
- yesterday Changed · +319 lines cf97e01ba748
- 6d ago First seen · 1 lines scan A 8956184205a3
yesterday-public-plugins marketplace is a plugin published in the GitHub repository Yesterday-AI/skills (2 stars, last pushed 3d 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.
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