Create, debug, and test GitHub Actions workflows and custom actions. Use when building CI/CD pipelines, automating workflows, or troubleshooting GitHub Actions.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# GitHub Actions Guide
## Critical Rules
**Custom Action Deployment:**
- New custom actions MUST be merged to the main branch before they can be used
- After the initial merge, they should be tested from feature branches
**Debug Steps:**
Add debug steps that print non-secret parameters when:
- Creating a new action, OR
- Troubleshooting a particularly tricky issue
(Not required for every workflow - use when needed)
## Effectiveness Principles
Actions cost CI minutes. Be deliberate, not iterative:
1. **Monitor, don't poll** - use `gh run watch` / `gh pr checks --watch` to follow runs live
2. **Read logs, don't guess** - fetch the failed job's log before changing code
3. **Print actual values** - debug steps reveal the real `inputs`/`github` context, not your assumptions
4. **Test locally first** - `act` runs workflows on your machine and avoids burning CI minutes
5. **Plan the smallest reproduction** - one job, minimal matrix, narrow trigger before scaling up
See [README.md](README.md) for the full debugging workflow, `gh` commands, and YAML debug-step examples.
## Key Gotchas
…
The line at the top of this page pins the label git:20260608.e56c5ef, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.
pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (1888 bytes)
pass: No zero-width or bidi control characters
pass: No instruction hidden inside an HTML comment
pass: No link to an exfiltration or paste host
pass: No credential-shaped string
pass: No instruction to send local credentials anywhere
pass: No text hidden with inline styles
pass: No prompt-injection phrasing
pass: No curl or wget piped into a shell
pass: No recursive delete of root, home or parent
pass: No instruction to read or print local credentials
pass: No base64 blob over 200 characters
pass: No link to a raw IP address
pass: No script tag
Source
GitHub
openhands/extensions · 179 stars · license MIT · pushed 2026-11-08 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_2cew5runtrfqtvos
GET https://markdownregistry.com/api/v1/resolve?ref=openhands/extensions/github-actions
GET https://markdownregistry.com/api/v1/blob/3bc931615299740031ec21eef92a3c1cc1acd91d88d6579c67e8e6021a0c83f0
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