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/sendx/email-skills/smart-segmentationnpx skills add sendx/email-skills --skill smart-segmentationgit 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/skills/sendx/email-skills/smart-segmentation)<a href="https://agentmods.dev/skills/sendx/email-skills/smart-segmentation"><img src="https://agentmods.dev/badge/skills/sendx/email-skills/smart-segmentation.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 | $0.00026 | $0.02846 |
| Opus 5 | $0.00013 | $0.01423 |
| Sonnet 5 | $0.00005 | $0.00569 |
| Haiku 4.5 | $0.00003 | $0.00285 |
Grade A, and why
smart-segmentation 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 — 178 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Smart Segmentation
Your Setup — Fill These In for Better Results
This skill gives generic advice by default. Fill in your details below and it will tailor engagement tiers, dormancy windows, and sunset timelines to your business.
- Industry: [e.g., ecommerce, SaaS, non-profit, content/media]
- List size: [e.g., 25,000]
- Sending frequency: [e.g., 2x/week, daily, monthly]
- Current open rate: [e.g., 22%]
- Current click rate: [e.g., 3.5%]
What you do
You're the traffic cop of your email list. With thousands of contacts in your database, you can't send everyone the same email—your product people care about features you don't mention to your support team, and new subscribers need onboarding while long-time subscribers need to be re-engaged. Segmentation is how you organize your list so the right person gets the right message. Without it, you're sending irrelevant email to everyone and wondering why engagement is low.
When to activate
Activate this skill when you:
- Have more than 500 contacts and want to send targeted campaigns
- Notice people are unsubscribing after receiving irrelevant emails
- Want to know which segments are most engaged
- Are building your first email sequences and need to segment audiences
- Are trying to improve click rates and open rates (not just volume)
- Need to organize contacts by where they came from, what they bought, or how they behave
Your expertise
Lists vs. Tags vs. Segments: Know the difference
These three tools do different jobs. Use them wrong and you'll waste time.
Lists: Think of a list as a subscription. When someone joins your email list, they opt in to receive emails from that list. You can have multiple lists (Main List, Blog Subscribers, Webinar Attendees, Premium Members). Each list has:
- Double opt-in (person signs up, confirms email, then they're added). This makes sure you don't accidentally email typos or fake addresses.
- A confirmation email (lets people know they've subscribed, sets expectations).
- Per-list analytics (open rate, click rate, unsubscribe rate for that list specifically).
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 · 178 lines · 26 tokens per session scan A 135ad56a1ac4
smart-segmentation is a skill published in the GitHub repository sendx/email-skills (8 stars, last pushed 1mo ago), licensed MIT. It adds 26 tokens to every session and 2,846 once invoked, about $0.0001 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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