What
A SKILL.md or agent file indented with tabs used to load with empty metadata. Frontmatter parsing now retries after expanding each leading tab to two spaces, in both the runtime reader and the plugin, skill and agent validator.
Details
- The retry returns a structured success or error result, so a genuine syntax error still logs "Failed to parse YAML frontmatter".
Evidence
let t = U1_(e).replace(/^\t+/gm, (r) => " ".repeat(r.length));
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
Names in the bundleSKILL.md
The entry above is what we published on the day. These lines were added later, as Anthropic's own pages caught up, and they sit beside the original rather than replacing it.
Confirmed since
Anthropic's documentation has since written up SKILL.md, on Claude Code changelog.
* Fixed plugins silently skipping a default monitors file or root SKILL.md that could not be checkedchangelog see the edit
One source agreesOne thing we can check says the same as this entry.
Anthropic's documentation agrees
Anthropic's documentation has since written up SKILL.md, on Claude Code changelog.