# Line9 Diagrams MCP server

Source: https://glimind.com/server/mcp-registry%2Fai.line9%2Fdiagrams
Registry id: `mcp-registry/ai.line9/diagrams`
Status: live (checked 2026-10-27T01:30:27.752Z)

## Verdict

Line9 Diagrams MCP server answered 100% of Glimind's liveness checks over 30 days, better than 42% of MCP servers, with 1020 ms median handshake and 0 outages in 90 days. Its agent-readiness grade is A (100/100) across 3 tools, costing an agent about 731 tokens to load. Checked every few minutes; no tool is ever called.

## Measurements (30 days)

| Metric | Value | Better than |
|---|---|---|
| Uptime, 30 days | 100% | 42% of MCP servers |
| Median handshake latency | 1020 ms | 20% of MCP servers |
| p95 handshake latency | 2845 ms | — |
| Checks in 30 days | 4,955 | — |
| Outages, 90 days | 0 | — |
| Median recovery | — | — |
| Agent-readiness score | 100/100 (A) | 94% of MCP servers |
| Tools | 3 | — |
| Tool-list size for an agent | ~731 tokens | 81% of MCP servers |
| Days observed | 29 | — |

## Install

```json
{
  "mcpServers": {
    "line9-diagrams-mcp-server": {
      "type": "http",
      "url": "https://mcp.line9.ai/mcp"
    }
  }
}
```

Claude Code:

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

## Tools (3)

- `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 
- `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
- `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 dia

Measured by Glimind (https://glimind.com): MCP handshake + tool list only, no tool is ever called. CC BY 4.0.