The Line9 MCP server,
connected in one click.
Render Mermaid with Line9 layout in your assistant. Connect the official Line9 MCP server to Claude, ChatGPT, or Cursor through gate — one gateway URL, no config files, security-checked.
Free to start · No credit card · No hosting needed
Add Line9 to your AI in one minute
Pick your client. Copy, paste, done — or let gate handle sign-ins and policies for you.
claude mcp add --transport http line9 https://mcp.line9.ai/mcpRun in your terminal, then restart Claude Code.
Line9 · https://mcp.line9.ai/mcp
What your AI can do with Line9
Real prompts you can type the moment it's connected — no setup, no docs to read.
“Use “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. Flowcha.”
“Use “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.”
“Use “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.”
How secure is the Line9 MCP server?
Every server in the gate directory has to pass the same four checks before your AI can touch it. Here's how Line9 holds up.
Official endpoint
Operated by Line9 (line9.ai) at its documented MCP endpoint — not a third-party mirror or community re-host.
No sign-in needed
This server only exposes public data — no account and no credentials are involved when you connect.
Scanned before it goes live
gate checks every tool for prompt injection, hidden instructions, data-exfiltration hints, and over-broad permissions before the server is available through your gateway.
Watched for drift
If Line9 adds or changes tools later, gate re-scans and alerts you — before your AI acts on the change.
Connected in three steps
Connect your gate
Add one gateway URL to Claude, ChatGPT, or any MCP client. One-time setup, about two minutes.
Pick Line9
Choose Line9 in the gate directory. No sign-in needed.
Use it anywhere
Line9's tools are live in every AI client you've connected — with rules and logging built in.
Free to start · No credit card · No hosting needed
The actual tools Line9 exposes
Fetched live from the official endpoint and re-checked daily by gate — not marketing copy.
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. Flowcha
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
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
Who runs the Line9 MCP server?
The Line9 MCP server at a glance
https://mcp.line9.ai/mcpQuestions, answered
Is there an official Line9 MCP server?
Yes — Line9 operates its own remote MCP server at mcp.line9.ai. gate connects you to that official endpoint and adds security scanning, per-tool access rules, and an activity log on top.
How do I connect Line9 to Claude or ChatGPT?
Add gate's gateway URL to your AI client once, then pick Line9 in the directory. No account or sign-in is needed. From then on, Line9's tools are available in every client you've connected to gate.
Do I need to host anything?
No. Line9 runs the server, and gate is fully managed. You just connect one URL — there's nothing to install, deploy, or maintain.
Is the Line9 MCP server safe to connect?
It's the vendor's official endpoint, and gate scans its tools for prompt injection and hidden instructions before it goes live, re-checks it whenever it changes, and lets you allow, block, or require approval for every single tool.
Is it free?
Yes — you can get started with gate for free and connect Line9 in minutes. No credit card required.
Connect more than just Line9
Every server below works through the same gateway URL — connect once, add tools anytime.
Squarespace DomainsDesignView →Set up Line9 in: Claude · Claude Code · ChatGPT · Cursor · VS Code