AI

An agent should write a Markdown code block, not a screenshot. MarkVis draws the chart from that block. No one has to fix the text by hand.

Fetch this

https://markvis.js.org/llms.txt

Fetch /llms.txt. Emit only the fields that file lists. Do not invent keys. Do not add a seventh type. Do not emit a PNG or JSON as the default data body.

Skill (optional, same language): skills/markvis/SKILL.md

What to emit

A fenced code block tagged chart / markvis / vis — one language. Types: bar line area scatter pie hist.

Order inside the block:

1. Optional markvis: 2
2. One key: value per line (type required; title theme unit x y series as listed in /llms.txt)
3. Blank line
4. Comma-separated rows, or one Markdown table — not JSON

Prefer

• A table of numbers (CSV or a Markdown table)
• Keep row order; do not force pie slices to 100
• On error: table plus one line with the stable error code

Avoid

• A flowchart tool for spreadsheet numbers
• A seventh chart type
• Silent sort of the categories
• Fields not listed in /llms.txt

Eval pairs: examples/prompts.md in the repo.