orbital-express: Skill for Claude Code

.claude/skills/add-mailer/SKILL.md

add-mailer is a skill for Claude Code from Hackbyrd/orbital-express. It costs 54 tokens per session (696 once invoked), scanned A, original, MIT.

A workflow for adding a transactional email, meaning an automatic message sent after an event, to a feature using an EJS template.

In plain words
What is it for?
Use it to create emails triggered by an action or background task, such as account notices or feature-related updates.
Why use it?
It provides a defined place and format for email templates, including safe previewing and test-email marking.

Skill for Claude Code

Written for Claude Code: installed under .claude/.

This is Hackbyrd/orbital-express's own configuration. It tells Claude Code how to work on orbital-express itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything orbital-express configures →

Needs its repository: it reads a path above its own folder, which exists only inside the repository. The line is const email = require('../../../services/email');.

Reuse

Borrowing it

Nothing to install: this file belongs to Hackbyrd/orbital-express. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/Hackbyrd/orbital-express/main/.claude/skills/add-mailer/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/Hackbyrd/orbital-express

Made for: Claude Code.

Wrote 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.

agentmods badge for add-mailer

README.md
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Your own site
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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.

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Your own site · 80×15
<a href="https://agentmods.dev/skills/hackbyrd/orbital-express/add-mailer"><img src="https://agentmods.dev/badge/skills/hackbyrd/orbital-express/add-mailer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 54 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 696 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
Origin original 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 5.1 $0.00054 $0.00696
Opus 5.5 $0.00022 $0.00278
Sonnet 5.5 $0.00011 $0.00139
Haiku 4.5 $0.00005 $0.00070

Measured 2mo ago against content hash de7574fe9be8, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

add-mailer 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 2mo 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.

.claude/skills/add-mailer/SKILL.md · 44 lines

How it starts

The opening of the file, as written. The whole thing — 44 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Add a mailer

Emails are EJS templates under a feature's mailers/ folder, sent via the global services/email.js. Read README "Mailers".

Steps

  1. Plan/sign-off: define recipient policy, trigger, template inputs, failure behavior, and tests; get sign-off before scaffolding or edits. Preview/apply complete structure with yarn repair <Feature> --dry-run then yarn repair <Feature>.

  2. Scaffold: yarn gen <Feature> -m <MailerName>. This validates PascalCase names/targets, creates the mailer folder, and exclusively creates index.ejs; an existing folder/template aborts before any write. The feature name is prepended only if absent. Never hand-create.

  3. Write index.ejs:

    • Top comment listing the args (template variables) the email expects.
    • Reference every variable as locals.<var> with a default fallback (e.g. <%= locals.firstName || 'there' %>) — required so the gulpfile can generate preview.html without erroring.
    • Always include the test-email banner driven by locals.isTestEmail (so non-prod emails are visibly marked).
  4. Preview: run yarn gulp (watches index.ejs and regenerates preview.html). You won't see a preview.html until the gulpfile runs.

  5. Send it from an action or task via services/email.js:

    const email = require('../../../services/email');
    await email.send({
      from: email.emails.<sender>.address,
      name: email.emails.<sender>.name,
      subject: '...',
      template: '<Feature><MailerName>', // = the mailer folder name
      tos: [recipientEmail],
      ccs: null, bccs: null,
      args: { firstName, ... } // the template variables
    });
    
    • Sending email is usually best done in a background task (enqueue from the action), not inline in the request — see the add-task skill.
  6. Tests/checks: assert the email service was called (jest.spyOn(email, 'send')) with the right template + args; in task tests assert the send happened as a side effect. Run yarn conventions:check, focused tests, then yarn test; finish with mandatory review-conventions.

Read the full file on GitHub · 44 lines

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. 2mo ago First seen · 44 lines · 54 tokens per session scan A de7574fe9be8

Subscribe to this mod's changes

add-mailer is a skill published in the GitHub repository Hackbyrd/orbital-express (15 stars, last pushed 2mo ago), licensed MIT. It adds 54 tokens to every session and 696 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-08-30.

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