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Line9 MCP Server

by line9 Your server? Claim it
answering

Line9 is answering right now. Last checked 6 min ago. It exposes 3 tools.

Render Mermaid with Line9 layout in your assistant.

Uptime history 5 days of history · worst day 95%
5 days agonow
95.6%
Uptime 24h
87 of 91 checks
3
Tools
read from the server
563 ms
Response time
average over 24h
open, no key
Access
streamable-http

Line9 does not always answer

Over the last week it answered 97.8% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 6 min ago.

run in your terminal
claude mcp add diagrams --transport http https://mcp.line9.ai/mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "diagrams": {
      "url": "https://mcp.line9.ai/mcp"
    }
  }
}
~/.codex/config.toml
[mcp_servers.diagrams]
url = "https://mcp.line9.ai/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "diagrams": {
      "url": "https://mcp.line9.ai/mcp"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "diagrams": {
      "url": "https://mcp.line9.ai/mcp"
    }
  }
}

Available tools 3

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

diagram
get_diagram
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 new one. Requires Line9 sign-in. This connector cannot publish or save. To publish, the user opens the diagram in Line9 (the `open_url` link) and publishes there — not with the Line9 CLI.
diagrams
list_diagrams
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
render_diagram
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, size, warnings, or a parse error with its line and column — plus an "Open in Line9" link. On a parse error, fix the named line and call again. Assistants that support MCP Apps show the diagram in a panel; there, do not paste the SVG or repeat the source in your reply. In an assistant with no panel (a terminal or editor), reply with the verdict line and the `open_url` link — that link is the only way the user sees the diagram. Write flowcharts as `flowchart LR` unless the user asks for top-to-bottom; chat panels are wide and short. No sign-in needed; renders carry a small Line9 mark unless the user is signed in to Line9 Pro. Set theme, orientation, spacing and legend in the source itself (`line9:` frontmatter; `flowchart LR`), never as arguments. This connector cannot publish or save. To publish, the user opens the diagram in Line9 (the `open_url` link) and publishes there — not with the Line9 CLI.

Endpoints

URLTransportStateLatencyChecked
https://mcp.line9.ai/mcp streamable-http answering 1089 ms 6 min ago

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Line9 — questions

Answers built from our own checks of this server.

What can Line9 do?
It exposes 3 tools, read directly from the server on our last check. Among them: get_diagram, list_diagrams, render_diagram. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
Is Line9 working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 87 of 91 checks got a reply (95.6%), average response time 563 ms. The bar chart above shows every period we have measured.
How do I connect Line9?
Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does Line9 need an API key?
No. Line9 completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 3 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is Line9?
It answers our handshake in 563 ms on average, which is faster than 26% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.