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 kensaurus/cursor-kenji --skill enhance-email-deliverabilitygit clone --depth 1 https://github.com/kensaurus/cursor-kenjiWrote 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/kensaurus/cursor-kenji/enhance-email-deliverability)<a href="https://agentmods.dev/skills/kensaurus/cursor-kenji/enhance-email-deliverability"><img src="https://agentmods.dev/badge/skills/kensaurus/cursor-kenji/enhance-email-deliverability/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/kensaurus/cursor-kenji/enhance-email-deliverability"><img src="https://agentmods.dev/badge/skills/kensaurus/cursor-kenji/enhance-email-deliverability.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 | $0.00073 | $0.01360 |
| Opus 5 | $0.00036 | $0.00680 |
| Sonnet 5 | $0.00015 | $0.00272 |
| Haiku 4.5 | $0.00007 | $0.00136 |
Grade A, and why
enhance-email-deliverability 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 — 145 lines — stays where its author put it; the contents beside it link to each section on GitHub.
enhance-email-deliverability — Inbox placement & lawful send
Degree of freedom: MIXED — T1 is the priority. Scoring auth/hygiene
[HIGH freedom]; DNS/config apply [LOW freedom — after approval].
Audit-and-fix. Templates stay on design-email.
Close the gap between "the email sends" and "the email arrives". A beautiful transactional template in spam is a broken signup flow.
Deliverability = authentication + reputation + hygiene + compliance. Miss any one and placement collapses.
Audit first. Apply DNS/config on approval. Template markup stays on
design-email.
This skill vs neighbors
| Skill | Owns |
|---|---|
| enhance-email-deliverability (this) | SPF/DKIM/DMARC, bounces, complaints, unsubscribe headers |
design-email |
Template markup, copy, React Email / MJML |
plan-privacy-compliance |
Consent to collect; this owns consent to send |
audit-analytics |
Whether open/click events fire (not inbox placement) |
Keep enhance-* here (audit-and-fix, same family as enhance-web-seo). Do
not steal "build a welcome email" from design-email.
How to reason
- Observe — SPF/DKIM/DMARC records and a real message's Authentication-Results
- Interpret — pass raw SPF/DKIM but fail alignment?
+all? DNS-only DKIM? - Classify — auth fail / hygiene hole / compliance miss / template (hand off)
- Severity — no DMARC or
+allblocks inbox placement
Worked example
Observe: one SPF with
+all; DKIM TXT present; no DMARC; marketing and password-resets shareexample.com. Interpret: anyone can spoof; Gmail/Yahoo bulk will fail; a campaign complaint can sink transactional mail. Classify: auth fail + domain mixing. Fix: SPF-all(or~allwhile warming), DMARCp=none+ruathen tighten, split transactional vs marketing domains — apply DNS only after approval.
Phase 0 — Detect sending setup [HIGH freedom]
- Provider: Resend / Postmark / SES / SendGrid / Mailgun / SMTP
- Sending domain(s) and DNS host
- Transactional vs marketing — they should not share a domain
- Where templates live (hand content issues to
design-email)
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 · 145 lines · 73 tokens per session scan A 90ffe1554f6e
enhance-email-deliverability is a skill published in the GitHub repository kensaurus/cursor-kenji (9 stars, last pushed 11d ago), licensed MIT. It adds 73 tokens to every session and 1,360 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 2026-09-03.
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