Skill execution fails when glob pattern contains backticks - shell command substitution bug

Bug Description

When running a skill (e.g., github-issue-cycle), the execution fails with a shell syntax error because backticks in glob patterns are interpreted as command substitution by bash.

Error Message

Error: Shell command failed for pattern "!`.github/PULL_REQUEST_TEMPLATE/default.md`": [stderr]
.github/PULL_REQUEST_TEMPLATE/default.md: line 2: syntax error near unexpected token `newline'
.github/PULL_REQUEST_TEMPLATE/default.md: line 2: `<!-- Briefly describe what and why you changed -->'

Root Cause

The file path .github/PULL_REQUEST_TEMPLATE/default.md is wrapped in backticks and passed to the shell. Bash interprets the backticks as command substitution, attempting to execute the markdown file as a script. The HTML comment <!-- ... --> in the markdown file then causes a bash syntax error.

Expected Behavior

File paths in glob patterns should be properly escaped before being passed to shell commands. Backticks should not trigger command substitution.

Environment

• OS: Windows 11
• Shell: bash (Git Bash)
• Claude Code version: latest

Steps to Reproduce

1. Have a file at .github/PULL_REQUEST_TEMPLATE/default.md with HTML comments
2. Run a skill that uses glob patterns (e.g., github-issue-cycle)
3. Observe shell command substitution error

Suggested Fix

Escape backticks or use single quotes when passing file paths to shell commands in the skill execution pipeline.