:trophy: The Golden Swiss Army Knife for markdown processing. 100% CommonMark compliant, AST w/ CST, Extensible, Fast, CJK-friendly.
yuin/goldmark is a Markdown parser written in Go that converts Markdown into structured output such as HTML while supporting CommonMark and custom syntax extensions. Developers use it to process, analyze, and generate Markdown in Go applications and tools. The catalogue add-ons provide agent instructions and integrations for working with the parser.
Latest release v2.1.9 · 25 Oct 2026
2 files for Codex, OpenCode and Claude Code: goldmark AGENTS.md, goldmark CLAUDE.md — 653 tokens loaded in every session.
AGENTS.md A 648 tok CLAUDE.md A 5 tok These files are yuin/goldmark's own configuration — they tell Codex, OpenCode and Claude Code how to work on this repository, so they are not mods to install elsewhere. Copy one as a starting point and replace the parts that are about this project.