Markdown
A block of standard GitHub-flavored markdown, for text you didn't hand-assemble into rich text.
markdown takes one raw markdown string and lets Slack do the parsing, instead of you building a
rich_text tree or a mrkdwn string by hand. Slack expands it into the same headings, lists,
dividers, code blocks, and tables you’d get from other blocks. It’s meant for text an LLM
produced, where you don’t control the exact markdown shape ahead of time.
Blockquotes work too, with formatting inside.
Fields
typestring
Always `markdown`.
stringtextstring
Standard markdown-formatted text. Limit 12,000 characters.
stringblock_id?string
A unique identifier for the block, up to 255 characters. Slack generates one if omitted.
stringExamples
Inline styles
Blockquotes work too, with formatting inside.
Headings and dividers
Headings past ### still render at the same size as ###. A line of --- renders as a divider.
Heading 1
Heading 2
Heading 3
Heading 4
Heading 5
Heading 6
Fenced code blocks
A fenced code block with a language tag renders with a language label and copy button, the same
chrome used by rich_text’s preformatted sections:
Tables
Standard GFM table syntax renders as a table, right inside the markdown text:
Sprint Status
| Task | Owner | Status |
|---|---|---|
| Authentication | Ada Lovelace | |
Dashboard | Grace Hopper | In Progress |
| API Docs | Alan Turing | Not Started |