Github Script Agent Skill

by github

Write robust JavaScript for GitHub Actions github-script steps.

450 tokens

context cost

the whole folder, loaded on every use

files

instructions only

copies elsewhere

how many repositories repackaged it

4864

stars on the repo

on the repository, not the skill itself

Install

one command, takes just this skill from the repository

npx skills add https://github.com/github/gh-aw --skill github-script

The instruction itself

6 sections, as written by the author

GitHub Action Script Best Practices

Use these guidelines for JavaScript executed by actions/github-script@v8.

Important Notes

This action provides @actions/core and @actions/github packages globally
Do not add import or require for @actions/core
Reference documentation:
https://github.com/actions/toolkit/blob/main/packages/core/README.md
https://github.com/actions/toolkit/blob/main/packages/github/README.md

Best Practices

Use core.info, core.warning, core.error for logging, not console.log or console.error
Use core.setOutput to set action outputs
Use core.exportVariable to set environment variables for subsequent steps
Use core.getInput to get action inputs, with required: true for mandatory inputs
Use core.setFailed to mark the action as failed with an error message

Step Summary

Use core.summary.* function to write output the step summary file.

Use core.summary.addRaw() to add raw Markdown content (GitHub Flavored Markdown supported)
Make sure to call core.summary.write() to flush pending writes
Summary function calls can be chained, e.g. core.summary.addRaw(...).addRaw(...).write()

Common Errors

Avoid any type as much as possible, use specific types or unknown instead
Catch handler: check if error is an instance of Error before accessing message property

catch (error) {
  core.setFailed(error instanceof Error ? error : String(error));
}

core.setFailed also calls core.error, so do not call both

Typechecking

Run make js to run the typescript compiler.

Run make lint-cjs to lint the files.

Run make fmt-cjs after editing to format the file.

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How to use it

Copy the folder

Take github/github-script from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

Check the name does not clash

The agent identifies a skill by the name field in its header. Two skills with the same name cannot sit side by side — one of them will be ignored.