Skill template processor incorrectly substitutes $1 in code blocks

Description

When a skill is loaded, the skill template processor incorrectly substitutes $1 placeholders within code blocks with user input text. This corrupts shell function examples in skill documentation.

Steps to Reproduce

1. Create a skill with shell functions that use $1 for arguments, e.g.:

``bash
jira-get() {
curl -s -H "Authorization: Bearer $JIRA_PAT" \
"$JIRA_URL/rest/api/2/issue/$1" | jq
}
``

1. Invoke the skill with arguments like: get all my open issues

1. Observe the rendered skill content

Expected Behavior

The $1 in the code block should remain as $1:

"$JIRA_URL/rest/api/2/issue/$1" | jq

Actual Behavior

The $1 is replaced with part of the user input (in this case all):

"$JIRA_URL/rest/api/2/issue/all" | jq

Impact

• Shell function examples in skills become incorrect/misleading
• Users copying these examples will have broken functions
• The substitution appears to take a word from the user's input string

Environment

• Claude Code CLI
• Skill: jira-pat-skill (custom skill using PAT authentication for Jira)
• The actual SKILL.md file contains the correct $1 - the corruption happens during skill loading/rendering

Workaround

None currently - the skill content is corrupted before it reaches the model.