email-template-developer

A guide for creating email, text-message, and push-notification templates, including Handlebars templates. Handlebars is a format that inserts changing values into text, such as a customer's name.

In plain words
What is it for?
Use it to edit template files, understand how the backend fills them in, test them with Playwright, and manage deployments.
Why use it?
It helps avoid mistakes when writing templates, checking their appearance in a browser, and deploying them for different customers or organizations.

Skill for Claude CodeCodex

Install

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.

agentmods
npx agentmods add skills/andreaskarz/vibe-coding-dev-setup/email-template-developer
Any agent
npx skills add AndreasKarz/Vibe-Coding-Dev-Setup --skill email-template-developer
Clone the repo
git clone --depth 1 https://github.com/AndreasKarz/Vibe-Coding-Dev-Setup

Made for: Claude Code, Codex.

Per session 108 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,374 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin unknown No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00108 $0.03374
Opus 5 $0.00054 $0.01687
Sonnet 5 $0.00022 $0.00675
Haiku 4.5 $0.00011 $0.00337

Measured 2d ago against content hash ac24b92e70dc, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

email-template-developer 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 2d 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.

.github/skills/email-template-developer/SKILL.md · 342 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Changes

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.

  1. 2d ago First seen · 342 lines · 108 tokens per session scan A ac24b92e70dc

Subscribe to this mod's changes

email-template-developer is a skill published in the GitHub repository AndreasKarz/Vibe-Coding-Dev-Setup (7 stars, last pushed 6mo ago), with no licence file. It adds 108 tokens to every session and 3,374 once invoked, about $0.0005 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.