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 theagentledger/agent-skills --skill newsletter-managergit clone --depth 1 https://github.com/theagentledger/agent-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/skills/theagentledger/agent-skills/newsletter-manager)<a href="https://agentmods.dev/skills/theagentledger/agent-skills/newsletter-manager"><img src="https://agentmods.dev/badge/skills/theagentledger/agent-skills/newsletter-manager/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/theagentledger/agent-skills/newsletter-manager"><img src="https://agentmods.dev/badge/skills/theagentledger/agent-skills/newsletter-manager.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 | $0.03267 |
| Opus 5 | $0.00036 | $0.01633 |
| Sonnet 5 | $0.00014 | $0.00653 |
| Haiku 4.5 | $0.00007 | $0.00327 |
Grade A, and why
newsletter-manager 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 11d 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
No licence file
A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.
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.
- 11d ago First seen · 420 lines · 72 tokens per session scan A f5af4710b798
newsletter-manager is a skill published in the GitHub repository theagentledger/agent-skills (6 stars, last pushed 6mo ago), with no licence file. It adds 72 tokens to every session and 3,267 once invoked, about $0.0004 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.
Other skills, from other repositories
newsletter
Use when running an email newsletter as a recurring publication — subject + preview pair, issues that turn opens into clicks, the welcome sequence, cadence and engagement tiering, growth loops, and a post-Apple-MPP click scorecard. NOT one-off launch or nurture sends (that is marketing), NOT SPF/DKIM/DMARC (that is…
newsletter-audience-segmenter
Produces a practical audience segmentation brief for a newsletter, identifying 3-5 distinct subscriber groups with tailored content recommendations and messaging strategies for each segment.
landing-page-copy-writer
Writes the complete copy for a newsletter subscribe page — headline, subheadline, value proposition, social proof block, what-to-expect section, and call-to-action button text — optimised for conversion without resorting to hype or false urgency.
referral-copy-writer
Writes the in-email referral section that asks existing subscribers to share the newsletter with colleagues or friends — including the ask, the framing of the reward or reciprocity, and the specific share copy subscribers can use verbatim.
subject-line-writer
Generates five distinct subject line options for a newsletter edition, each using a different psychological approach proven to improve open rates, matched to the publication's voice and the edition's content.
marketing-psychology
When the user wants to apply psychological principles, mental models, or behavioral science to marketing. Also use when the user mentions 'psychology,' 'mental models,' 'cognitive bias,' 'persuasion,' 'behavioral science,' 'why people buy,' 'decision-making,' 'consumer behavior,' 'anchoring,' 'social proof,'…