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Courier Skills is an agent skill: a set of markdown files your coding agent reads before it writes Courier code. Install it once and the agent builds against the APIs Courier ships today, not the ones it half-remembers.

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Install Courier Skills

Works with Cursor, Claude Code, Codex, Windsurf, Cline, and any tool that supports agent skills. Run npx skills update courier to pick up changes.
Agents discover the skill from the name and description frontmatter in SKILL.md. There is exactly one, named courier, and nothing else to configure.

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Verify the skill is loaded

Confirm the installer put the skill where your agent reads it:
courier should appear in the list. The Claude Code plugin doesn’t show up there, so skip to the next step if you installed that way. Then ask your agent a question only the skill can answer:
An agent with the skill loaded names files such as transactional.md and sms.md. Those files exist only in the skill, so an agent answering from memory can’t name them. Most agents load skills when a session starts. If npx skills list shows the skill but the agent doesn’t know it, start a new session.

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What the skill does for your agent

Courier Skills gives your agent Courier’s own guidance on building notifications: how to call the API, which Courier feature fits each job, and the rules each channel needs. Your agent writes working Courier code on the first try, and it can debug the notification code you already have, including why a message didn’t deliver. The agent reads SKILL.md first, which points it at the one or two files a task needs. It loads only those, so it codes faster and spends fewer tokens than it would searching the docs or retrying calls that fail.

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What you can build with it

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What the skill covers

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FAQ

Courier Skills needs no API key. It is a set of instructions the agent reads, and it touches nothing in your workspace. The code the agent writes needs a key to run, and so do the MCP server and CLI.
Courier Skills changes the code your agent writes. The MCP server and the Courier CLI call the Courier API, so the agent can create templates, send notifications, and read delivery logs in your workspace. Most setups install Skills and the MCP server together.
Courier Skills installs into Claude Code, Cursor, Codex, Windsurf, Cline, and any other tool that loads agent skills from a SKILL.md file. Claude Code can also install it as a plugin that self-updates.
Courier Skills is MIT-licensed and public at trycourier/courier-skills on GitHub.