Diagram Lint — lint, fix and draft Mermaid diagrams in Markdown

Paste a Markdown document with Mermaid diagrams: your browser lints it against the markdown and mermaid style guides of the markdown-mermaid-writing skill - accTitle/accDescr, %%{init} themes, inline styles, snake_case ids, the end-keyword trap, H2 emoji, footnotes - and applies safe fixes, free. A paid run reviews it, returns a fixed copy re-linted before you take it, or drafts a new diagram from a prose passage. Derived from @k-dense-ai/markdown-mermaid-writing (k-dense-ai/scientific-agent-skills; style guides by Clayton Young / Superior Byte Works LLC). Independent tool, not affiliated with or endorsed by Mermaid Chart Inc. or the Mermaid project.