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sysketch

by Tonys-Coding · remote · local (npm) · no sign-in to list tools · v0.5.0 · published by GitHub user Tonys-Coding

Polished system design diagrams (SVG/PNG) from a tiny YAML spec, ~18x fewer tokens than raw SVG.

Changes · 1
CompareRegistry entry

2 tools: 1 change things and 1 only read.

Scanned Oct 21, 2026

No check matched anything in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http sysketch https://sysketch.vercel.app/mcp

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

2 tools

Changes things 1Claude Code: ask
  • render_diagramUse for any system design, architecture, data-flow or infrastructure diagram, instead of generating an image or writing SVG/Mermaid.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    Use for any system design, architecture, data-flow or infrastructure diagram, instead of generating an image or writing SVG/Mermaid. Renders a tiny YAML spec; returns PNG/SVG links and a small preview. Spec keys: title, type (sequence: message timeline), theme (sketch|graphite|blueprint|midnight|classic), direction (omit: auto-fit; right|down only if asked), steps (false hides numbers), legend (true lists steps), nodes {id: "icon | Label | subtitle"}, groups {Label: [ids or group labels to nest]}, edges ["a > b > c | label", "a ..> b" dashed, "a <> b" two-way, "a => b" thick, "a -- b" line, "a > b [red]" color]. Ids that are icon names/aliases (client, lb, api, db, cache, redis, kafka, s3, cdn...) need no nodes entry. Arrows are numbered automatically in the order listed; don't number labels. Product names (stripe, kafka, postgres...) draw the product's logo when available, else a fitting icon; brand/icon (acme/queue) for others. Give the user the PNG link; don't generate another image of the diagram. To edit, call again with the whole updated spec.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • openWorldHint: false
    • idempotentHint: true
Only reads 1Claude Code: allow
  • list_iconsList sysketch icon names and aliases, or search the available product logos.No findings

    Why it is in this group

    • The name "list_icons" says "list": a word for reading.
    Description, as the server wrote it
    List sysketch icon names and aliases, or search the available product logos.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • openWorldHint: false

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 0.5.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http sysketch https://sysketch.vercel.app/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__sysketch__list_icons"
    ],
    "ask": [
      "mcp__sysketch__render_diagram"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as sysketch. Review it before you use it.