MCP server

Line9 Official

ai.line9/diagrams

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

Render Mermaid with Line9 layout in your assistant.

Website

At a glance

Type

MCP server

Publisher

line9.ai (verified by the MCP Registry)

Status

Working at last check

Tools

3

Token cost

About 955 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http diagrams https://mcp.line9.ai/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.diagrams]
url = "https://mcp.line9.ai/mcp"

Gemini CLI

{"mcpServers":{"diagrams":{"httpUrl":"https://mcp.line9.ai/mcp"}}}

Cursor

{"mcpServers":{"diagrams":{"url":"https://mcp.line9.ai/mcp"}}}

VS Code

{"servers":{"diagrams":{"type":"http","url":"https://mcp.line9.ai/mcp"}}}

Antigravity

agy mcp add diagrams https://mcp.line9.ai/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"diagrams","server_url":"https://mcp.line9.ai/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"diagrams","server_url":"https://mcp.line9.ai/mcp"}

Tools

• get_diagram ~224 tokens
  Fetch a published diagram's current Mermaid source by name or slug, and show it rendered. The returned source is stamped with the diagram's identity — keep the `line9:` frontmatter block when you edit it so that Line9 recognises the diagram when it is opened and published there instead of creating a
• list_diagrams ~161 tokens
  List the diagrams published in the user's Line9 workspace(s): name, visibility, version, last update and permalink. Use it to find a diagram before `get_diagram`. Requires Line9 sign-in.
• render_diagram ~570 tokens
  Render Mermaid source with Line9's layout engine. Call this whenever you write or change Mermaid and the user should see the result. Flowcharts and sequence diagrams get Line9's layout; other Mermaid kinds are rendered with Mermaid's own layout and flagged as such. Returns a short verdict — kind, si

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