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Crystal

Official registry AI and agents

Self-curating memory your AI tools share: provenance, verified citations, and trust tiers.

Website

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http crystal 'https://crystal-api-118881845105.us-east5.run.app/mcp'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "crystal": {
            "type": "http",
            "url": "https://crystal-api-118881845105.us-east5.run.app/mcp"
        }
    }
}

Frequently asked questions

What is Crystal?

Self-curating memory your AI tools share: provenance, verified citations, and trust tiers.

How do I install Crystal?

It runs as a remote server. In Claude Code: claude mcp add --transport http crystal 'https://crystal-api-118881845105.us-east5.run.app/mcp'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does Crystal need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Who maintains Crystal?

It is published by EraHQ. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.