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 instructions/sendx/email-skills/claude-mdgit clone --depth 1 https://github.com/sendx/email-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/instructions/sendx/email-skills/claude-md)<a href="https://agentmods.dev/instructions/sendx/email-skills/claude-md"><img src="https://agentmods.dev/badge/instructions/sendx/email-skills/claude-md.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 | $0.00555 | $0.00555 |
| Opus 5 | $0.00278 | $0.00278 |
| Sonnet 5 | $0.00111 | $0.00111 |
| Haiku 4.5 | $0.00056 | $0.00056 |
Grade A, and why
email-skills CLAUDE.md 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 5d 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 — 60 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Email Marketing Skills
A collection of AI agent skills for email marketing, built by SendX and SendPost.
Repo structure
skills/<skill-name>/SKILL.md— each skill is a standalone markdown file- All skills are flat:
skills/<skill-name>/SKILL.md - Categories are organizational labels in the README, not filesystem directories
Skill format
Every SKILL.md has YAML frontmatter:
---
name: skill-name
description: "One sentence description"
category: deliverability | compliance | campaign | content | growth | analytics | esp-ops
---
Followed by the skill instructions in markdown.
How skills work
Each skill gives the agent specialized knowledge for one email marketing task. Skills reference each other by name (e.g., "see the smart-segmentation skill when targeting needs work").
The email-deliverability-expert-skill includes a references/ folder with supplementary docs: provider-specific tactics, shared pool management, and a warmup playbook.
Key context
- SendX = email marketing platform (campaigns, automation, segmentation, analytics)
- SendPost = email infrastructure API (IP management, bounce processing, deliverability monitoring)
- Target audience for skills = non-technical email marketers
- Skills should use plain language, avoid jargon, include real benchmarks and thresholds
- Every claim should be actionable: "your bounce rate is above 2%" beats "your bounce rate is high"
Available skills
ab-testing— Email A/B testingapi-campaign-builder— SendX API campaign managementcampaign-strategy— Campaign type selectioncompliance-navigator— Email privacy law complianceemail-analytics— Metric interpretation and actionsemail-copywriting— Subject lines, preview text, body copyemail-deliverability-expert-skill— Deliverability audit, diagnosis, and fixes (has references/)esp-hardbounce-unlock— Hard bounce unlock evaluationesp-malicious-behavior— Malicious sender investigationindustry-playbooks— Vertical-specific email strategieslist-growth-engine— List building with popups, forms, lead magnetssmart-segmentation— List segmentation and targetingworkflow-automation— Automated email sequences
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.
- 5d ago First seen · 60 lines · 555 tokens per session scan A 8906e1d47431
email-skills CLAUDE.md is an instructions file published in the GitHub repository sendx/email-skills (8 stars, last pushed 1mo ago), licensed MIT. It adds 555 tokens to every session, about $0.0028 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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