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Charts by Szum
io.szum/charts in the official MCP registry.
Endpoint https://szum.io/mcp.
The registry describes it as: Create, inspect, manage, and render charts and data visualizations as SVG/PNG or interactive embeds.
We read its 14 tools on 2026-10-21. Nothing in them matched our tool-poisoning rules. It also sets server instructions, text a client puts in front of the model on connect; those were read too.
A clean read means these rules found nothing, not that the server is harmless. A server can change its tools at any time, which is why the index reads it again every week.
Tools it advertises
render_chart save_chart list_charts get_chart get_chart_document get_preview_state update_chart rename_chart delete_chart list_themes validate_chart list_chart_types get_examples get_schema
Run this server? Show the check in your README
The badge reflects the latest weekly read: 
[](https://lazaretto.dev/mcp-registry/io-szum-charts)How this was checked
Lazaretto connects to the endpoint the way any MCP client does, asks the server to introduce itself and list its tools, and reads every name, description, parameter schema and server instruction for tool poisoning: hidden directive blocks, orders to read local secrets, parameters built to carry secrets or the conversation out, orders that redirect another server's tools, and invisible characters. It never calls a tool. What we found across the registry.
To run the same check every time Claude Code adds a server, install the free lazaretto-guard plugin. Browse every server in the index.