(registered 2026-09-24, last updated 2026-09-24)

Identifier:
  mdc

Name:
  Markdown Checklists (MDC)

Description:
  A checklist-oriented variant of Markdown. Every MDC document is valid GitHub Flavored Markdown; MDC additionally assigns machine-readable meaning to GFM task-list items and to a single trailing attribute block per item ({#id .class @assignee key=value}), defining item states (open, done, cancelled), typed dependencies (needs=), gating (.gate/.optional), template-vs-run documents, and a canonical form suitable for deterministic, line-granular edits. A document is MDC if and only if its YAML frontmatter contains an "mdc" version key; the file extension (conventionally .mdc.md) is not significant. Any Markdown or GFM processor renders an MDC document correctly without MDC support; MDC-specific metadata degrades to visible literal text.

Additional Parameters:
  None.

Fragment Identifiers:
  None. MDC does not define fragment-identifier syntax or semantics beyond those of the underlying Markdown/HTML rendering. MDC item identifiers (the "#id" attribute) are an in-document addressing scheme used by MDC tooling, not URI fragments.

References:
  MDC Specification v0.1
  https://mdcspec.dev/spec/v0.1

Contact Information:
  Tim Walsh - spec&mdcspec.dev