ErdDocs MCP Server

by erddocs Your server? Claim it

answering

ErdDocs is answering right now. Last checked 12 min ago. It exposes 1 tools.

ER diagrams from SQL, Prisma or ORM models. One tool, no account, nothing stored.

Uptime history 6 days of history

6 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

243 ms

Response time

average over 24h

open, no key

Access

streamable-http

Nothing serious here today

Today is the operative word: we check ErdDocs every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 12 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add erd-diagram --transport http https://erddocs.com/mcp

Settings → Connectors → Add custom connector, then paste this address

https://erddocs.com/mcp

~/.codex/config.toml

[mcp_servers.erd-diagram]
url = "https://erddocs.com/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "erd-diagram": {
      "url": "https://erddocs.com/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "erd-diagram": {
      "type": "http",
      "url": "https://erddocs.com/mcp"
    }
  }
}

Available tools 1

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

open

open_er_diagram

Open an interactive ER diagram of a database schema on erddocs.com. Use it when the user wants to see, understand, review or document their database structure, or asks for an ER diagram. Pass the schema text exactly as it is in the project. It reads SQL dumps and DDL (PostgreSQL, MySQL, SQL Server, SQLite), Prisma schema.prisma, DBML, Mermaid erDiagram, PlantUML, Django models.py, SQLAlchemy models, Sequelize models, TypeORM entities and a folder of Laravel migrations (concatenate the files). For SQL, the structure is enough: no INSERT data. Returns a link. The user opens it in a browser and gets the diagram with every table and relation laid out, relations without declared foreign keys found by column name and drawn dashed, and a data dictionary. Nothing is stored on the server: the schema travels inside the link and is parsed in the user's browser. A link holds a schema of a few dozen tables (about 100–200 characters of link per table, depending on comments); for a larger one the tool says so and the user pastes it on erddocs.com instead.

Endpoints

URL	Transport	State	Latency	Checked
https://erddocs.com/mcp	streamable-http	answering	266 ms	12 min ago

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ErdDocs — questions

Answers built from our own checks of this server.

What can ErdDocs do?

It exposes 1 tools, read directly from the server on our last check. Among them: open_er_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 ErdDocs working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 243 ms. The bar chart above shows every period we have measured.

How do I connect ErdDocs?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does ErdDocs need an API key?

No. ErdDocs completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 1 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is ErdDocs?

It answers our handshake in 243 ms on average, which is faster than 55% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.