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 agentmods add skills/sequenzy/skills/emaildeliverabilityskillnpx skills add Sequenzy/skills --skill emaildeliverabilityskillgit clone --depth 1 https://github.com/Sequenzy/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/sequenzy/skills/emaildeliverabilityskill)<a href="https://agentmods.dev/skills/sequenzy/skills/emaildeliverabilityskill"><img src="https://agentmods.dev/badge/skills/sequenzy/skills/emaildeliverabilityskill.svg" alt="Measured on agentmods" 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 | $0.00086 | $0.00635 |
| Opus 5 | $0.00043 | $0.00318 |
| Sonnet 5 | $0.00017 | $0.00127 |
| Haiku 4.5 | $0.00009 | $0.00064 |
Grade A, and why
emaildeliverabilityskill 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 6d 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 — 49 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Email Deliverability Skill
Protect the sender before chasing growth. Separate authentication, reputation, content, list quality, and provider issues before recommending action.
Scope
inbox placement, authentication, sender reputation, complaint control, and remediation workflows.
Request Signals
DNS authentication audits, warmup plans, complaint spike triage, blocklist checks, bounce analysis, and reputation recovery.
Guardrails
- Primary lens: inbox placement, authentication, sender reputation, complaint control, and remediation workflows.
- Common request signals: DNS authentication audits, warmup plans, complaint spike triage, blocklist checks, bounce analysis, and reputation recovery.
- Default posture: Protect the sender before chasing growth. Separate authentication, reputation, content, list quality, and provider issues before recommending action.
- Useful output family: DNS/authentication audits, reputation triage notes, warmup schedules, suppression reviews, monitoring plans, and remediation runbooks.
- Production boundary: separate recommendation from execution.
- Evidence boundary: say which source material supports the recommendation.
- Review boundary: identify the human owner for risky changes.
- Data boundary: do not assume missing fields, consent, or suppression state.
Execution Path
- Classify the deliverability problem: authentication failure, bounce spike, complaint spike, spam-folder placement, throttling, blocklist, or engagement decay.
- Collect evidence by domain, provider, segment, campaign, and time window rather than treating all mail as one stream.
- Check SPF, DKIM, DMARC, custom tracking domain, bounce domain, alignment, and recent DNS changes.
- Review list acquisition, consent, suppression, frequency, reactivation, and recent imports for reputation risk.
- Recommend a staged remediation plan with stop-loss thresholds, monitoring cadence, and owner for each action.
- Keep DNS edits, suppression changes, imports, provider migrations, and production throttling behind explicit approval.
What ships with it
2 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.
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.
- 6d ago First seen · 49 lines · 86 tokens per session scan A 08934b6678e7
emaildeliverabilityskill is a skill published in the GitHub repository Sequenzy/skills (2 stars, last pushed yesterday), licensed MIT. It adds 86 tokens to every session and 635 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.
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