Unquoted bracket syntax in `argument-hint` frontmatter causes YAML to
parse the value as an array/mapping instead of a string literal. This
crashes Claude Code's tab-completion TUI with React error #31 ("Objects
are not valid as a React child") when the renderer tries to display the
hint.
Two commands affected:
- `heal-skill`: `[optional: ...]` parsed as `[{optional: "..."}]`
- `create-agent-skill`: `[skill ...]` parsed as `["skill ..."]`
Fix: wrap values in quotes, consistent with the other 18 commands in the
plugin that already quote their `argument-hint` values.
Ref: https://github.com/anthropics/claude-code/issues/29422
8a530f7e25