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 Notysoty/openagentskills --skill newsletter-summary-writergit clone --depth 1 https://github.com/Notysoty/openagentskillsWrote 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/notysoty/openagentskills/newsletter-summary-writer)<a href="https://agentmods.dev/skills/notysoty/openagentskills/newsletter-summary-writer"><img src="https://agentmods.dev/badge/skills/notysoty/openagentskills/newsletter-summary-writer/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/notysoty/openagentskills/newsletter-summary-writer"><img src="https://agentmods.dev/badge/skills/notysoty/openagentskills/newsletter-summary-writer.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 | $0.00021 | $0.01340 |
| Opus 5 | $0.00010 | $0.00670 |
| Sonnet 5 | $0.00004 | $0.00268 |
| Haiku 4.5 | $0.00002 | $0.00134 |
Grade A, and why
Newsletter Summary Writer 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 12d 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 — 117 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Newsletter Summary Writer
What this skill does
This skill takes any source content — a long article, a Twitter/X thread, a research paper, a podcast transcript, a blog post, or a document — and condenses it into a polished, newsletter-ready summary under 200 words. The output includes a punchy hook, scannable key takeaways, and a "Why it matters" closing line that gives readers a reason to care.
Use this when curating content for a weekly newsletter, a team digest, a Slack summary post, or any context where you need to surface the key ideas from something long without making people read the whole thing.
How to use
Claude Code / Cline
Copy this file to .agents/skills/newsletter-summary-writer/SKILL.md in your project root.
Then paste the source content and ask:
- "Use the Newsletter Summary Writer skill to summarize this article."
- "Summarize this research paper for my weekly dev newsletter using the Newsletter Summary Writer skill."
You can also specify tone (casual, professional, technical) and the newsletter's audience if you want the output tailored.
Cursor
Add the "Prompt / Instructions" section to your .cursorrules file. Paste the source content into the chat and ask for a newsletter summary.
Codex
Paste the full source content (or a URL if Codex can access it) along with the instructions below. Specify word count if you need something shorter or longer than the 200-word default.
The Prompt / Instructions for the Agent
When asked to write a newsletter summary, follow these steps:
-
Read the full source content. Do not skim — identify:
- The central argument or finding
- The most surprising, counterintuitive, or valuable insight
- Supporting evidence, data, or examples worth mentioning
- The author's conclusion or recommendation
- Any caveats, limitations, or opposing views worth noting
-
Extract 3–5 key takeaways. Each takeaway must:
- Express one complete idea in one sentence
- Be concrete — no vague claims like "this is interesting" or "this matters"
- Stand alone: a reader who only reads the bullets should understand the substance
- Start with a strong verb or noun (avoid starting with "The article says..." or "According to...")
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.
- 12d ago First seen · 117 lines · 21 tokens per session scan A e0d6aac16b99
Newsletter Summary Writer is a skill published in the GitHub repository Notysoty/openagentskills (9 stars, last pushed 29d ago), licensed MIT. It adds 21 tokens to every session and 1,340 once invoked, about $0.0001 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 2026-08-31.
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