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fix: prepend YAML frontmatter to Cursor .mdc files (#1699)

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* fix: prepend YAML frontmatter to Cursor .mdc files for auto-inclusion

Cursor IDE requires YAML frontmatter with `alwaysApply: true` in .mdc
rule files for them to be automatically loaded. Without this frontmatter,
users must manually configure glob patterns for the rules to take effect.

This fix adds frontmatter generation to both the bash and PowerShell
update-agent-context scripts, handling three scenarios:
- New .mdc file creation (frontmatter prepended after template processing)
- Existing .mdc file update without frontmatter (frontmatter added)
- Existing .mdc file with frontmatter (no duplication)

Closes #669

🤖 Generated with [Claude Code](https://claude.com/code)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* refactor: address Copilot review suggestions

- Handle CRLF line endings in frontmatter detection (grep '^---' instead
  of '^---$')
- Fix double blank line after frontmatter in PowerShell New-AgentFile
- Remove unused tempfile import from tests
- Add encoding="utf-8" to all open() calls for cross-platform safety

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Fabián Silva
2026-02-27 11:20:00 -03:00
committed by GitHub
parent 525eae7f7e
commit b55d00beed
3 changed files with 298 additions and 3 deletions
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26
scripts/bash/update-agent-context.sh
View File

@@ -351,10 +351,19 @@ create_new_agent_file() {
# Convert \n sequences to actual newlines
newline=$(printf '\n')
sed -i.bak2 "s/\\\\n/${newline}/g" "$temp_file"
# Clean up backup files
rm -f "$temp_file.bak" "$temp_file.bak2"
# Prepend Cursor frontmatter for .mdc files so rules are auto-included
if [[ "$target_file" == *.mdc ]]; then
local frontmatter_file
frontmatter_file=$(mktemp) || return 1
printf '%s\n' "---" "description: Project Development Guidelines" "globs: [\"**/*\"]" "alwaysApply: true" "---" "" > "$frontmatter_file"
cat "$temp_file" >> "$frontmatter_file"
mv "$frontmatter_file" "$temp_file"
fi
return 0
}
@@ -492,13 +501,24 @@ update_existing_agent_file() {
changes_entries_added=true
fi
# Ensure Cursor .mdc files have YAML frontmatter for auto-inclusion
if [[ "$target_file" == *.mdc ]]; then
if ! head -1 "$temp_file" | grep -q '^---'; then
local frontmatter_file
frontmatter_file=$(mktemp) || { rm -f "$temp_file"; return 1; }
printf '%s\n' "---" "description: Project Development Guidelines" "globs: [\"**/*\"]" "alwaysApply: true" "---" "" > "$frontmatter_file"
cat "$temp_file" >> "$frontmatter_file"
mv "$frontmatter_file" "$temp_file"
fi
fi
# Move temp file to target atomically
if ! mv "$temp_file" "$target_file"; then
log_error "Failed to update target file"
rm -f "$temp_file"
return 1
fi
return 0
}
#==============================================================================