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skills/gh-attach/SKILL.md

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+---
+name: gh-attach
+description: 'Uploads a local file (screenshot, image, PDF, zip, video) to GitHub user-attachments, downloads GitHub user-attachments, and embeds local files in a PR, issue, or comment. Use when asked to "attach a screenshot to the PR", "add an image to the issue", "embed before/after screenshots", "attach this file", or "download this GitHub attachment". Powered by `gh-attach`.'
+---
+
+# gh-attach
+
+`gh attach` uploads a file to GitHub's internal user-attachments endpoint (no public API exists) and prints the URL, which GitHub auto-renders (image/video/file) wherever it's pasted. The URL inherits the repo's visibility, so private-repo uploads stay private.
+
+## Prerequisites
+
+```sh
+gh extension list | grep -q 'gh attach' || gh extension install sudosubin/gh-attach
+```
+
+Uploads use a GitHub browser session cookie, not the `gh` token. By default, `gh` must be authenticated so `gh-attach` can select the matching browser account. If the wrong account is selected, add `--browser <name> --profile <name>`. For headless use, set `GH_ATTACH_SESSION_TOKEN` to the bare `user_session` cookie value. Treat it as a full account credential.
+
+## Steps
+
+**1. Upload**: Use an absolute quoted path. `-R` is optional inside a repository. For GHES, use `-R host/owner/repo`. The command prints the URL on one line. GitHub auto-renders it (image/video/file), so use it as-is:
+
+```sh
+URL=$(gh attach "$FILE" -R <owner>/<repo>)
+```
+
+**2. Embed** (always `--body-file -`, e.g. `gh pr comment/edit`, `gh issue comment/edit`):
+
+```sh
+printf '## Screenshots\n\n%s\n' "$URL" | gh pr comment <pr> -R <owner>/<repo> --body-file -
+```
+
+**3. Download**: Specify the destination explicitly. Private attachments use the active `gh` token, with browser cookies as an authorization fallback:
+
+```sh
+gh attach download "$URL" -O "$FILE"
+```
+
+## Notes
+
+- Private repo: URL renders only for authorized viewers. An anonymous fetch is expected to return 404 or 403.
+- Sizing: embed `<img width="800" src="$URL">` instead of the bare URL.
+- GitHub Cloud and GHES decide which file extensions and content types they accept.