Python: Parse YAML block scalars in SKILL.md frontmatter#5863
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SergeyMenshykh merged 1 commit intoMay 15, 2026
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The frontmatter parser previously matched only single-line `key: value` pairs, so block scalar indicators (`|` literal, `>` folded, with chomping `-`/`+`) were silently truncated to the indicator character. Multi-line descriptions like `description: >\n ...` lost their content. Add `_parse_yaml_scalar_value()` which detects block scalar indicators, collects indented continuation lines, strips the common leading indentation, joins per scalar style (newlines for `|`, spaces for `>`), and applies chomping per the YAML 1.2 spec. Update `_extract_frontmatter()` to use the helper for unquoted values. Adds 15 unit tests covering literal/folded styles, all chomping variants, indentation handling, content containing colons, non-description fields, tab indentation, blank-line preservation, and a regression test for plain values. Fixes microsoft#5713. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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moonbox3
approved these changes
May 15, 2026
westey-m
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May 15, 2026
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Motivation and Context
Fixes #5713. The Python
_extract_frontmatter()parser only matched single-linekey: valuepairs, so YAML block scalar indicators (|literal,>folded, with chomping-/+) were silently truncated to the indicator character. Multi-line frontmatter values likedescription: >\n ...lost their content.This actively affects the SKILL.md files under
python/.github/skills/, all of which usedescription: >.Description
_parse_yaml_scalar_value()to_skills.py: detects block scalar indicators, collects indented continuation lines, strips common leading indentation, joins per scalar style (newlines for|, spaces for>), and applies chomping per the YAML 1.2 spec._extract_frontmatter()to use the helper for unquoted values.Contribution Checklist