Skill SKILL.md content with backticks causes shell evaluation errors

Bug Description

When loading skills from ~/.claude/skills/*/SKILL.md, inline code backticks containing shell-special characters (specifically !) are being interpreted by the shell, causing errors that prevent the skill from loading.

Error Message

Error: Bash command failed for pattern "!` force unwrap is a red flag - crashes if nil
     - Force casting `": [stderr]
     zsh: command not found: force
     (eval):cd:2: too many arguments

Steps to Reproduce

1. Create a skill at ~/.claude/skills/my-skill/SKILL.md
2. Include inline backticks with ! in the content, e.g.:

```markdown

• ! force unwrap is a red flag
• Force casting as! can crash
• try! that will crash on error

```

1. Try to invoke the skill with /my-skill
2. The skill fails to load with a shell evaluation error

Root Cause

It appears that during skill loading or description matching, the SKILL.md content is being passed through a shell evaluation context (likely eval in zsh). The backtick characters in markdown inline code (` ``) are interpreted as command substitution by the shell, causing the text between them to be executed as commands.

Evidence from the error:

• zsh: command not found: force — the word "force" from the text "force unwrap" is being executed as a command
• (eval):cd:2: too many arguments — confirms eval is involved in processing the content

Expected Behavior

Skill SKILL.md content should be treated as plain text/markdown and never passed through shell evaluation. Backticks and other shell-special characters in skill content should not cause errors.

Workaround

Replace inline backticks containing ! with double quotes in the SKILL.md file:

• ` ! → "!"`
• ` as! → "as!"`
• ` try! → "try!"`

Environment

• Claude Code: latest (as of 2026-02-09)
• Shell: zsh
• OS: macOS (Darwin 25.3.0)
• Skills location: ~/.claude/skills/