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diagramkit works inside Claude and ChatGPT as a connector. You ask for a diagram in the chat, the assistant sends your request to diagramkit, and the finished image comes back in one to three minutes. Diagrams use your diagramkit account’s credits and stay private to that account.

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Claude (web, desktop and mobile)

  1. In Claude, open Settings → Connectors. If diagramkit is listed, select it and choose Connect. Otherwise choose Add custom connector, name it diagramkit and enter https://mcp.diagramkit.ai/mcp.
  2. Sign in to diagramkit in the window that opens, or create a free account.
  3. In a chat, ask how something works or paste numbers to chart. Claude calls diagramkit and shows the image.
On Team and Enterprise Claude plans, an owner adds the connector for the organization first, then each person connects their own diagramkit account.

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Claude Code

Install the plugin, which adds the connector and a skill that tells Claude Code when a diagram helps:
Or add the connector alone with claude mcp add --transport http diagramkit https://mcp.diagramkit.ai/mcp. Claude Code opens the diagramkit sign-in the first time it calls a tool.

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ChatGPT

  1. In ChatGPT, open Apps and search for diagramkit, then choose Connect. (Until the listing is live, a workspace with developer mode on can add https://mcp.diagramkit.ai/mcp as a custom app.)
  2. Sign in to diagramkit, or create a free account.
  3. Type @diagramkit in a chat and ask.
On Business, Enterprise and Edu, your admin chooses which apps the workspace can use.

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Codex

Add colinmatthews/diagramkit-plugin as a plugin marketplace, then run codex plugin add diagramkit@diagramkit.

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What you can ask for

Add where the diagram will be used (“for our docs”, “for a LinkedIn carousel”, “as a data story”) and diagramkit shapes the frame, text and downloads for it. See Presets.

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Your brand (Team and Enterprise)

Ask the assistant to “use our brand: primary colour #0f766e, Inter for headings”. It shows a preview on a sample diagram, and applies the brand to every new diagram once you say yes. From a codebase, Claude Code or Codex can gather your design tokens and figures and send them to diagramkit’s brand assistant; you review and apply the result on the Brand kit page.

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Privacy

diagramkit receives only what the assistant sends when it calls a diagramkit tool: your request, any images you attach and the ids of your diagrams. It does not receive your conversation. See the privacy policy.

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Disconnect

Remove diagramkit under Settings → Connectors in Claude, or Apps in ChatGPT. To delete your diagrams or account, use the web app or email support.