Unknown frontmatter shape
Type URI: https://modeled-information-format.github.io/mif-rs/references/errors/unknown-frontmatter-shape/v1
HTTP status: 400
Exit code: 2
Emitted by: mif-frontmatter (FrontmatterError::UnknownShape, via FrontmatterShape::try_from)
Message
Section titled “Message”unknown frontmatter shape: {0:?} (must be "v1-canonical" or "pre-projected")({0:?} is the offending shape string, debug-formatted, hence the quotes
around it in the rendered message — UnknownShape is a tuple variant, so
its #[error(...)] format string addresses the field positionally, not by
name.)
A caller-facing shape argument (e.g. mif-cli emit-markdown --shape, or
the emit_markdown_document MCP tool’s shape parameter) named something
other than the two recognized [FrontmatterShape] variants.
Suggested fix
Section titled “Suggested fix”MaybeIncorrect — use "v1-canonical" or "pre-projected".