feat(claude): add skill to read gists

yarn-project/.claude/skills/read-gist/SKILL.md

@@ -0,0 +1,40 @@
+---
+name: read-gist
+description: Fetch and display a GitHub gist. Triggers when the user asks to read, fetch, or view a URL from gist.github.com.
+argument-hint: "<gist URL or ID>"
+allowed-tools: Bash(gh gist *), WebFetch
+---
+
+# Read Gist
+
+Fetch and display the contents of a GitHub gist.
+
+## Trigger
+
+Activate this skill when the user provides a URL matching `gist.github.com` or asks to fetch/read a gist by ID.
+
+## Parameters
+
+The argument is a gist URL or gist ID: $ARGUMENTS
+
+## Steps
+
+1. **Extract the gist ID** from the input. It can be:
+   - A full URL like `https://gist.github.com/<user>/<id>` -> extract `<id>`
+   - A full URL like `https://gist.github.com/<id>` -> extract `<id>`
+   - A raw URL like `https://gist.githubusercontent.com/...` -> extract the gist ID segment
+   - A bare gist ID (hex string)
+
+2. **Try `gh gist view`** first (preferred):
+
+   ```bash
+   gh gist view <id> --raw
+   ```
+
+   If the gist has multiple files, list them first with `gh gist view <id>` (without `--raw`) to show filenames, then fetch with `--raw` or specify a filename with `-f <filename>` if the user asked for a specific file.
+
+3. **Fallback to WebFetch** only if `gh` is not available or the command fails with an auth/install error:
+   - Fetch `https://gist.githubusercontent.com/<user>/<id>/raw` for single-file gists
+   - Or fetch the gist API endpoint `https://api.github.com/gists/<id>` and extract file contents from the JSON response
+
+4. **Return the contents** to the caller. If there are multiple files, show each file with its filename as a header.