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Three MCP servers · free, no key, no sign-in

Connect your AI assistant to Digital Gemology and ask it about gem cuts, gem identification and gemology. It answers from our measurements and lessons, and links to the page it used. The three servers are free and read-only. They need no key and no sign-in.

The three servers

Add one, two or all three. Each is a remote MCP server (Model Context Protocol) over Streamable HTTP.

Chat apps

Add a server once in the app's settings. Then switch it on in a chat.

Claudeclaude.ai, desktop and mobile apps
  1. Open Customize > Connectors.
  2. Click + Add > Add custom connector.
  3. Type a name, for example Digital Gemology, paste https://digitalgemology.com/mcp and click Continue.
  4. For authentication, choose No sign in, then click Add.
  5. In a chat, click + (lower left) > Connectors and switch it on.

Repeat for https://digitalgemology.com/mcp/gems and https://digitalgemology.com/mcp/learn to add the other two servers. A free plan allows one custom connector. On Team and Enterprise plans, an owner adds the connector for the organization, and each member clicks Connect.

Claude guide

ChatGPTPro, Business, Enterprise and Edu · web only
  1. Open Plugins (chatgpt.com/plugins).
  2. Click + > Add custom MCP server.
  3. Type a name, and under Connection paste https://digitalgemology.com/mcp.
  4. Set authentication to none: our servers need no sign-in.
  5. Tick I understand and want to continue, click Create as a plugin, then install it.
  6. Start a new chat, type @ and pick the plugin.

Repeat for https://digitalgemology.com/mcp/gems and https://digitalgemology.com/mcp/learn to add the other two servers. The @ applies to one message: type it again for the next question. On Business, only admins and owners can add plugins.

ChatGPT guide

Geminipersonal accounts in the US, English
  1. On a computer, open gemini.google.com.
  2. Open Settings > Connected Apps.
  3. Under Custom apps, click Add a custom app.
  4. Paste https://digitalgemology.com/mcp, click Next and follow the steps.
  5. In a chat, type @ and pick the app.

Repeat for https://digitalgemology.com/mcp/gems and https://digitalgemology.com/mcp/learn to add the other two servers. You add apps on the web; after that they also work in the mobile app.

Gemini guide

Grok
  1. Open grok.com/connectors.
  2. Click New Connector > Custom.
  3. Paste https://digitalgemology.com/mcp. Our servers need no sign-in.

Repeat for https://digitalgemology.com/mcp/gems and https://digitalgemology.com/mcp/learn to add the other two servers. On Business and Enterprise plans, an admin adds the connector first.

Grok guide

Perplexity
  1. Open Plugins in the sidebar (or Customize > Connectors).
  2. Click Add custom > Add MCP connector > Remote.
  3. Type a name and paste https://digitalgemology.com/mcp.
  4. Under Advanced, set Authentication to None and Transport to Streamable HTTP.
  5. Tick the box, click Add, then click the connector card to switch it on.

Repeat for https://digitalgemology.com/mcp/gems and https://digitalgemology.com/mcp/learn to add the other two servers. In an organization, an admin must first allow members to add custom connectors.

Perplexity guide

Mistral Vibeformerly Le Chat
  1. Open the Connectors page.
  2. Click + Add Connector and open the Custom MCP Connector tab.
  3. Type a name without spaces, for example digitalgemology, and paste https://digitalgemology.com/mcp.
  4. Click Connect. Vibe finds that no sign-in is needed.

Repeat for https://digitalgemology.com/mcp/gems and https://digitalgemology.com/mcp/learn to add the other two servers. Vibe asks before each tool call. To stop that, open the connector card > Functions > Always allow. On team plans, ask your admin.

Mistral Vibe guide

Microsoft CopilotCopilot Studio agents only
  1. In Copilot Studio, open your agent's Tools page.
  2. Click Add a tool > New tool > Model Context Protocol.
  3. Type a server name and a description, and paste https://digitalgemology.com/mcp as the Server URL.
  4. Set the authentication type to None and click Create.
  5. Click Create a new connection, then Add to agent.

Repeat for https://digitalgemology.com/mcp/gems and https://digitalgemology.com/mcp/learn to add the other two servers. The free Copilot app cannot add MCP servers.

Microsoft Copilot guide

Coding tools

One command or one config file. The snippets add all three servers.

Claude Code
  1. Run these three commands in a terminal:
claude mcp add --transport http digital-gemology https://digitalgemology.com/mcp
claude mcp add --transport http digital-gemology-gems https://digitalgemology.com/mcp/gems
claude mcp add --transport http digital-gemology-learn https://digitalgemology.com/mcp/learn

Add -s user to use them in every project.

Claude Code guide

OpenAI CodexCLI, IDE extension and ChatGPT desktop app
  1. Add this to ~/.codex/config.toml:
[mcp_servers.digital-gemology]
url = "https://digitalgemology.com/mcp"

[mcp_servers.digital-gemology-gems]
url = "https://digitalgemology.com/mcp/gems"

[mcp_servers.digital-gemology-learn]
url = "https://digitalgemology.com/mcp/learn"

In the IDE extension you can also use the gear menu > MCP servers > Add server, type Streamable HTTP, then Restart extension.

OpenAI Codex guide

Cursor
  1. Add this to ~/.cursor/mcp.json (all projects) or .cursor/mcp.json (one project):
{
  "mcpServers": {
    "digital-gemology": { "url": "https://digitalgemology.com/mcp" },
    "digital-gemology-gems": { "url": "https://digitalgemology.com/mcp/gems" },
    "digital-gemology-learn": { "url": "https://digitalgemology.com/mcp/learn" }
  }
}

Cursor guide

VS Code with GitHub Copilot
  1. Open the Command Palette and run MCP: Add Server > HTTP.
  2. Paste https://digitalgemology.com/mcp and type digital-gemology as the server ID.
  3. Choose Global > Copilot Global and accept the trust prompt.
{
  "mcpServers": {
    "digital-gemology": { "type": "http", "url": "https://digitalgemology.com/mcp" },
    "digital-gemology-gems": { "type": "http", "url": "https://digitalgemology.com/mcp/gems" },
    "digital-gemology-learn": { "type": "http", "url": "https://digitalgemology.com/mcp/learn" }
  }
}

Or paste all three into ~/.copilot/mcp-config.json, as above. The older .vscode/mcp.json file uses "servers" in place of "mcpServers". On Copilot Business and Enterprise, an admin must switch on the MCP servers in Copilot policy.

VS Code with GitHub Copilot guide

Devin Desktopformerly Windsurf
  1. Run these three commands in a terminal:
devin mcp add digital-gemology --url https://digitalgemology.com/mcp
devin mcp add digital-gemology-gems --url https://digitalgemology.com/mcp/gems
devin mcp add digital-gemology-learn --url https://digitalgemology.com/mcp/learn

Add -s user to use them in every project. Devin asks before each tool call.

Devin Desktop guide

Zed
  1. Open Settings > AI > MCP Servers > Add Server > Add Remote Server, or add this to settings.json:
"context_servers": {
  "digital-gemology": { "url": "https://digitalgemology.com/mcp" },
  "digital-gemology-gems": { "url": "https://digitalgemology.com/mcp/gems" },
  "digital-gemology-learn": { "url": "https://digitalgemology.com/mcp/learn" }
}

Zed guide

JetBrains AI Assistant and Junie
  1. Open Settings > Tools > AI Assistant > Model Context Protocol (MCP) > Add.
  2. Choose HTTP, paste this JSON, then click OK and Apply:
{
  "mcpServers": {
    "digital-gemology": { "url": "https://digitalgemology.com/mcp" },
    "digital-gemology-gems": { "url": "https://digitalgemology.com/mcp/gems" },
    "digital-gemology-learn": { "url": "https://digitalgemology.com/mcp/learn" }
  }
}

For Junie, put the same JSON in ~/.junie/mcp/mcp.json.

JetBrains AI Assistant and Junie guide

Antigravity and Gemini CLI
  1. In Antigravity, add this to ~/.gemini/config/mcp_config.json (or type /mcp in the CLI):
{
  "mcpServers": {
    "digital-gemology": { "serverUrl": "https://digitalgemology.com/mcp" },
    "digital-gemology-gems": { "serverUrl": "https://digitalgemology.com/mcp/gems" },
    "digital-gemology-learn": { "serverUrl": "https://digitalgemology.com/mcp/learn" }
  }
}

Gemini CLI (for Gemini Code Assist plans): gemini mcp add --transport http digital-gemology https://digitalgemology.com/mcp. In Gemini CLI's settings.json, use "httpUrl".

Antigravity and Gemini CLI guide

Models on your computer

The servers are on the web, so the computer must be online.

LM Studioversion 0.3.17 or later
  1. Open the Program tab in the right sidebar > Install > Edit mcp.json.
  2. Add the three servers:
{
  "mcpServers": {
    "digital-gemology": { "url": "https://digitalgemology.com/mcp" },
    "digital-gemology-gems": { "url": "https://digitalgemology.com/mcp/gems" },
    "digital-gemology-learn": { "url": "https://digitalgemology.com/mcp/learn" }
  }
}

Use a model that is good at tool calls.

LM Studio guide

Ollama, with Open WebUIOpen WebUI 0.6.31 or later
  1. Ollama has no MCP client of its own. In Open WebUI, as an admin, open Settings > Admin > Integrations.
  2. Under External Tool Servers, click + Add Connection.
  3. Set Type to MCP (Streamable HTTP), not OpenAPI.
  4. Paste https://digitalgemology.com/mcp, set Auth to None and click Save.
  5. In a chat, open + > Integrations > Tools and switch it on.

Repeat for https://digitalgemology.com/mcp/gems and https://digitalgemology.com/mcp/learn to add the other two servers.

Ollama, with Open WebUI guide

Developers

Call the servers from your own code. Each API connects to them for you.

Claude APIMCP connector, beta
  1. Send the MCP connector beta header (see the guide for the current one) and add to the request:
"mcp_servers": [
  { "type": "url", "url": "https://digitalgemology.com/mcp", "name": "digital-gemology" },
  { "type": "url", "url": "https://digitalgemology.com/mcp/gems", "name": "digital-gemology-gems" },
  { "type": "url", "url": "https://digitalgemology.com/mcp/learn", "name": "digital-gemology-learn" }
],
"tools": [
  { "type": "mcp_toolset", "mcp_server_name": "digital-gemology" },
  { "type": "mcp_toolset", "mcp_server_name": "digital-gemology-gems" },
  { "type": "mcp_toolset", "mcp_server_name": "digital-gemology-learn" }
]

No authorization_token is needed.

Claude API guide

OpenAI Responses API
  1. Add the servers to tools:
"tools": [
  { "type": "mcp", "server_label": "digital_gemology", "server_url": "https://digitalgemology.com/mcp", "require_approval": "never" },
  { "type": "mcp", "server_label": "digital_gemology_gems", "server_url": "https://digitalgemology.com/mcp/gems", "require_approval": "never" },
  { "type": "mcp", "server_label": "digital_gemology_learn", "server_url": "https://digitalgemology.com/mcp/learn", "require_approval": "never" }
]

Our tools only read, so "never" is safe. Without it, each call waits for approval.

OpenAI Responses API guide

Gemini APIInteractions API
  1. Add the servers to tools. Names cannot contain a hyphen:
"tools": [
  { "type": "mcp_server", "name": "digital_gemology", "url": "https://digitalgemology.com/mcp" },
  { "type": "mcp_server", "name": "digital_gemology_gems", "url": "https://digitalgemology.com/mcp/gems" },
  { "type": "mcp_server", "name": "digital_gemology_learn", "url": "https://digitalgemology.com/mcp/learn" }
]

Gemini API guide

If it does not work

Steps checked against each app’s documentation in November 2026. Apps change their menus often: if a step no longer matches, tell us. For every tool and endpoint, see AI agents and the API.