actionlint

actionlint is a plugin for Claude Code from melodic-software/claude-code-plugins. Its manifest loads nothing; the 2 skills, 2 hooks it bundles cost 125 tokens per session together, scanned A, original, MIT.

A checker for GitHub Actions workflow files. GitHub Actions workflows are YAML instructions that tell GitHub how to run automated tasks such as tests or deployments.

In plain words
What is it for?
Use it to inspect GitHub Actions workflow files after edits and receive advisory findings from actionlint.
Why use it?
A small syntax or configuration mistake can stop an automated workflow from running correctly. Checking files as they are edited helps surface possible problems early.

Plugin for Claude Code

Written for Claude Code: a Claude Code plugin manifest. Also seen: mentions Claude Code.

Good fit Use it to inspect GitHub Actions workflow files after edits and receive advisory findings from actionlint.

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Install in Claude Code
/plugin marketplace add melodic-software/claude-code-plugins
/plugin install actionlint
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.

Clone the repo
git clone --depth 1 https://github.com/melodic-software/claude-code-plugins

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 actionlint

README.md
[![agentmods](https://agentmods.dev/badge/plugins/melodic-software/claude-code-plugins/actionlint/github.svg)](https://agentmods.dev/plugins/melodic-software/claude-code-plugins/actionlint)
Your own site
<a href="https://agentmods.dev/plugins/melodic-software/claude-code-plugins/actionlint"><img src="https://agentmods.dev/badge/plugins/melodic-software/claude-code-plugins/actionlint/github.svg" alt="Measured on agentmods" height="20"></a>

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.

agentmods 80×15 button for actionlint

Your own site · 80×15
<a href="https://agentmods.dev/plugins/melodic-software/claude-code-plugins/actionlint"><img src="https://agentmods.dev/badge/plugins/melodic-software/claude-code-plugins/actionlint.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session not measured What this adds to a session before it is invoked.
When invoked not measured The manifest loads nothing itself; its 2 skills, 2 hooks cost 125 tokens a session between them.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Security

Grade A, and why

actionlint 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 today.

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.

plugins/actionlint/.claude-plugin/plugin.json · 33 lines

What it actually says

{
  "name": "actionlint",
  "version": "0.13.1",
  "description": "Lint GitHub Actions workflows with actionlint at git pre-commit, on changed lines, for every author; optionally check uncommitted workflow changes when a turn ends.",
  "author": {
    "name": "Melodic Software",
    "email": "[email protected]"
  },
  "license": "MIT",
  "keywords": [
    "actionlint",
    "github-actions",
    "workflow",
    "yaml",
    "linter",
    "hook"
  ],
  "userConfig": {
    "actionlint_enabled": {
      "type": "boolean",
      "title": "Check workflows",
      "description": "Turn the plugin's Claude Code hooks (the opt-in end-of-turn check and the session-start probe) on or off",
      "default": true
    },
    "actionlint_end_of_turn": {
      "type": "boolean",
      "title": "Check workflows in uncommitted changes at turn end",
      "description": "At the end of each turn, run the pre-commit actionlint check over the workflow lines changed since the last commit and hand any findings back so they are fixed before the turn ends, at most once per turn. Off by default.",
      "default": false
    }
  }
}
Contents

What it installs

The manifest is a name and a version. 2 skills, 2 hooks travel with it, and installing the plugin installs all of them — 125 tokens a session between them. Each is measured on its own page, and each can be installed alone.

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. today Changed · -7 lines 0f4a5e77aa10
  2. 3d ago Changed 117964edbd99
  3. 5d ago Changed 0b74c62f3baf
  4. 9d ago Changed 842d3b0c85d9
  5. 12d ago Changed 14c119e54d0c
  6. 13d ago Changed · -1 lines f1e28b1daeef
  7. 14d ago Changed 1d2745792365
  8. 15d ago Changed 4505f7acbcf7
  9. 16d ago Changed 8a1ab30a480f
  10. 17d ago First seen · 41 lines scan A 0beb7d5e691d

Subscribe to this mod's changes

actionlint is a plugin published in the GitHub repository melodic-software/claude-code-plugins (26 stars, last pushed today), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. 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.