Borrowing it
Nothing to install: this file belongs to Asymmetric-al/core. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/Asymmetric-al/core/develop/.agents/skills/email-best-practices/SKILL.mdgit clone --depth 1 https://github.com/Asymmetric-al/coreWrote 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/asymmetric-al/core/email-best-practices)<a href="https://agentmods.dev/skills/asymmetric-al/core/email-best-practices"><img src="https://agentmods.dev/badge/skills/asymmetric-al/core/email-best-practices/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/asymmetric-al/core/email-best-practices"><img src="https://agentmods.dev/badge/skills/asymmetric-al/core/email-best-practices.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 | $0.00061 | $0.00774 |
| Opus 5 | $0.00030 | $0.00387 |
| Sonnet 5 | $0.00012 | $0.00155 |
| Haiku 4.5 | $0.00006 | $0.00077 |
Grade A, and why
email-best-practices 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 10d 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
Licensed AGPL-3.0
The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.
What ships with it
10 files 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.
- references/compliance.md 4.1 KB
- references/deliverability.md 3.3 KB
- references/email-capture.md 3.4 KB
- references/email-types.md 5.7 KB
- references/list-management.md 4.5 KB
- references/marketing-emails.md 3.2 KB
- references/sending-reliability.md 4.7 KB
- references/transactional-email-catalog.md 10 KB
- references/transactional-emails.md 2.4 KB
- references/webhooks-events.md 4.2 KB
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.
- 10d ago First seen · 70 lines · 61 tokens per session scan A 71e78a0978cd
email-best-practices is a skill published in the GitHub repository Asymmetric-al/core (391 stars, last pushed today), licensed AGPL-3.0. It adds 61 tokens to every session and 774 once invoked, about $0.0003 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 2026-08-30.
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