[Bug]: YAML frontmatter parser misinterprets pipe block scalar continuation lines as top-level keys #1427
Description
Describe the bug
When a SKILL.md uses description: | with indented lines containing USE FOR: or DO NOT USE FOR:, the parser treats them as top-level YAML attributes instead of string content, producing Attribute 'DO NOT
USE FOR' is not supported in skill files.
Per the YAML spec, indented continuation lines under a pipe block scalar are always part of the parent key's string value. This is also consistent with the agentskills.io spec.
Related PR: microsoft/GitHub-Copilot-for-Azure#880
Affected version
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Steps to reproduce the behavior
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Expected behavior
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Additional context
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