skills

Name: skills
Author: Sendmux

by Sendmux

Verified

Agent skills for Sendmux

53stars

1forks

JavaScript

Added 6/27/2026

Installation

# Add to your Claude Code skills
git clone https://github.com/Sendmux/skills

Getting Started

Guides for using ai agents skills like skills.

Caveman: Cut Claude Token Use by 65%
How agent-side prompt compression works, when to use it, and when not to.
What is an AI Skills Marketplace?
Definitions, how marketplaces work, and how to choose between them in 2026.
Getting Started with AI Skills

Security ReportVerified

Last scanned: 6/28/2026

{
  "issues": [],
  "status": "PASSED",
  "scannedAt": "2026-06-28T07:52:51.705Z",
  "npmAuditRan": true,
  "pipAuditRan": true,
  "promptInjectionRan": true
}

README.md

Frequently Asked Questions

What is skills?

skills is an open-source ai agents skill for AI coding assistants such as Claude Code, Codex CLI, and ChatGPT, built by Sendmux. Agent skills for Sendmux. It has 53 GitHub stars.

Is skills safe to use?

Yes. skills passed SkillsLLM's automated security scan — a dependency vulnerability audit plus prompt-injection heuristics — with no high-severity issues. You can read the full report in the Security Report section on this page.

How do I install skills?

Clone the repository with "git clone https://github.com/Sendmux/skills" and add it to your Claude Code skills directory (see the Installation section above).

What programming language is skills written in?

skills is primarily written in JavaScript. It is open-source under Sendmux on GitHub, so you can review or fork the full source.

Are there alternatives to skills?

Yes. SkillsLLM lists many other AI Agents skills you can browse and compare side by side. Open the AI Agents category from the badge at the top of this page, or use the Related Skills and comparison links further down to weigh skills against similar tools.

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Build your first AI agent from scratch - tool use, ReAct pattern, memory, deployment

41 minBeginner

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Sendmux Agent Skills

Official Sendmux skills for AI coding agents.

Marketplace install

This repository contains Sendmux plugin bundles for Cursor, Claude, and Codex. The Cursor bundle is prepared but is not available through /add-plugin until its marketplace submission is approved.

Cursor (after marketplace publication):

/add-plugin sendmux

Claude app, Claude Desktop, and Cowork:

Open Customize.
Go to Plugins.
In Personal plugins, click + and choose Add marketplace.
Choose Add from a repository.
Enter Sendmux/skills, then install the Sendmux plugin.

Claude Code:

/plugin marketplace add Sendmux/skills
/plugin install sendmux@sendmux
/reload-plugins

Codex app and Codex CLI:

codex plugin marketplace add Sendmux/skills

Then open Plugins in the Codex app or /plugins in Codex CLI and install Sendmux from the Sendmux marketplace.

Direct Agent Skills install

Use skills add when your agent supports raw Agent Skills rather than plugin marketplaces.

npx skills add Sendmux/skills

Install one skill from the pack:

npx skills add Sendmux/skills --skill sendmux-send-email

Update an installed pack:

npx skills update

What This Pack Teaches

Choose the cheapest correct Sendmux surface for the task: MCP for connected agents, the sendmux CLI for terminal one-shots, and SDKs for application flows.
Use the right credential for each job: smx_root_* for account-level work, send-capable smx_mbx_* keys or owner-approved Sending-resource smx_agent_* tokens for sending, smx_mbx_* keys for single-mailbox work, and scoped smx_agent_* tokens for self-registered agent mailbox work.
Prefer efficient calls: batch operations, cursor pagination, conditional requests, idempotency keys, counts, snippets, and delta sync where the public surface supports them.
Verify results before reporting success.

Skills Catalogue

The catalogue is built item by item from the local API, SDK, CLI, and MCP source of truth.

Skill	Use when
`sendmux-getting-started`	Choosing a Sendmux surface, setting up auth, or making a first verified call.
`sendmux-send-email`	Sending single or batch transactional email.
`sendmux-attachments`	Uploading, downloading, or sending attachments without wasting context on base64.
`sendmux-mailbox-agent`	Reading, triaging, replying, or syncing one mailbox.
`sendmux-management`	Managing domains, mailboxes, sending accounts, webhooks, billing, and logs.
`sendmux-cli`	Using the `sendmux` CLI from a terminal.
`sendmux-mcp-setup`	Connecting Sendmux MCP servers to an agent client.
`sendmux-token-efficient-usage`	Choosing low-token Sendmux calls and avoiding wasteful reads.
`sendmux-email-for-agents`	Giving an AI agent an inbox, challenge-first self-registration flow, or email workflow, even when Sendmux is not named.

Target matrix

Target	Recommended install
Cursor	After official marketplace publication, run `/add-plugin sendmux`.
Claude app, Claude Desktop, Cowork	Add marketplace from repository `Sendmux/skills`, then install Sendmux.
Claude Code	`/plugin marketplace add Sendmux/skills`, then `/plugin install sendmux@sendmux`.
Codex app and Codex CLI	`codex plugin marketplace add Sendmux/skills`, then install Sendmux from Plugins or `/plugins`.
Agent Skills clients	`npx skills add Sendmux/skills`.
Single-skill installs	`npx skills add Sendmux/skills --skill <skill-name>`.

Marketplace plugins and raw Agent Skills only teach workflows. They do not grant Sendmux access. Authorise hosted MCP, create API keys, or use agent access before asking an agent to act on Sendmux data.

Development

This repo uses the Agent Skills format:

skills/
  <skill-name>/
    SKILL.md
    references/
    scripts/
    assets/

Each skill must be validated, benchmarked against a baseline, and packaged before it is marked complete.

Generate Cursor, Claude, and Codex marketplace bundles:

node scripts/build-plugin-bundles.mjs
node scripts/check-plugin-bundles.mjs

The canonical skill source stays in skills/. Cursor reads it directly; generated Cursor, Claude, and Codex manifests plus both MCP files are checked for drift in CI.

See docs/eval-lint-package-playbook.md for the local eval, lint, package, and install-smoke loop. See docs/regen-update-playbook.md for the source drift check and regeneration procedure.