MCP server for charts
Is there an MCP server that makes chart images?
Yes. Add https://platemark.rowhousesoftware.com/mcp as a remote MCP server and the agent gets a render_chart tool. It passes the chart type, a title and the numbers; the tool returns the PNG to show inline, a link that works for a year, and a sentence of alt text that describes what the chart shows.
Agents are good at finding and summarizing numbers but have nowhere to draw them. Code interpreter charts look like default matplotlib and only live in that chat. render_chart gives a finished, consistent chart the agent can drop into an email draft, a doc, a Slack message or a slide.
No key is needed to start: an agent without one can call create_account with an email and get 100 free credits a month. A chart is 1 credit.
// What the agent sends to render_chart
{
"type": "bar",
"title": "Revenue by month",
"format": "currency",
"labels": ["Jan", "Feb", "Mar", "Apr"],
"values": [12400, 15800, 14200, 19900],
"highlight": "Apr"
}Questions
Which MCP clients work?
Any client that supports remote Streamable HTTP servers, including Claude Desktop, Claude Code, Cursor, VS Code and ChatGPT connectors.
Can it make several lines or stacked bars?
Yes. Send series: [{name, values}] with up to 8 series.
Does the agent get the image or just a link?
Both. The tool returns the PNG as image content and the link as text.