# rhysd/actionlint

:octocat: Static checker for GitHub Actions workflow files

Repository: https://github.com/rhysd/actionlint
Canonical: https://ross.abutalabs.com/products/actionlint
Homepage: https://rhysd.github.io/actionlint/
Language: Go
License: MIT
License Family: permissive
Topics: github-actions, lint, linter, ci, actions
Last push: 2026-07-16T06:05:57+00:00

## Health v2 (maintenance only)
Score: 84/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 92, release rhythm 65, longevity 100
- inputs: {"age_days": 1926, "days_push": 48, "days_rel": 156, "gap_med": 39.5, "n_releases_24m": 11}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4172, forks 263 (observed 2026-08-28T04:08:38.046741+00:00)

## What it is
actionlint is a static checker for GitHub Actions workflow files, written in Go. It validates syntax, type-checks ${{ }} expressions, verifies action inputs/outputs, integrates shellcheck/pyflakes, and detects security issues like script injection and hard-coded credentials.

## Use cases
- validate github actions workflow files before committing
- catch errors in ci workflow yaml
- check ${{ }} expression types in github actions
- find script injection vulnerabilities in workflows
- lint run: shell scripts in github actions
- verify action inputs and outputs are correct

## When to choose
- you maintain GitHub Actions workflows and want to catch errors before pushing
- you want automated security checks like script injection detection in CI definitions
- you need shellcheck/pyflakes integration for run: scripts
- you want a fast, single-binary linter usable locally, in CI, or as a pre-commit hook

## When to avoid
- you need linting for general YAML files unrelated to GitHub Actions
- you want a generic CI/CD pipeline tool rather than a workflow file checker
- you need runtime validation of workflows rather than static analysis

## Facets
- artifact type: cli-tool
- maturity: active
- function: linter, ci-cd, static-site-generator, developer-tools
- domain: developer-tools, apis
- platform: cli, cross-platform, wasm, go
- tags: github-actions, workflow-validation, yaml-linter, shellcheck-integration, static-analysis, devops, automation

## Member repositories
- rhysd/actionlint (main) score 84

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:38.046741+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:22:44.597187+00:00, confidence not recorded.
  - readme: https://github.com/rhysd/actionlint (fetched 2026-08-28T04:08:38.046741+00:00, sha 6fbe686f757e)
  - homepage: https://rhysd.github.io/actionlint/ (fetched 2026-08-29T09:13:18.744039+00:00, sha 43fec99d8036)
- Data as of 2026-08-30T08:39:29.467469+00:00.