JustOnce vs Mastadoon Prime MCP

In-depth architectural comparison of the JustOnce and Mastadoon Prime MCP MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

Which MCP Server Should You Choose?

J

Choose JustOnce when:

• You need dedicated capabilities in the Knowledge & Memory domain.
• You prefer remote streaming HTTP/SSE transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).

Explore JustOnce Details

Choose Mastadoon Prime MCP when:

• You need dedicated capabilities in the Knowledge & Memory domain.
• You prefer remote streaming HTTP/SSE transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).

Explore Mastadoon Prime MCP Details

Feature & Specification Comparison

Specification	J JustOnce Knowledge & Memory	Mastadoon Prime MCP Knowledge & Memory
Summary	Persistent memory for AI assistants — one shared, OAuth-secured vault for every MCP client.	Persistent, agent-owned memory with encrypted storage and shared knowledge commons.
Category & Scope	Knowledge & Memory	Knowledge & Memory
Quality signal

Tools & Capabilities Breakdown

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

{
  "mcpServers": {
    "justonce": {
      "url": "https://justonce.ai"
    }
  }
}

{
  "mcpServers": {
    "agent-memory-2": {
      "url": "https://memory.sylex.ai/sse"
    }
  }
}

Related MCP Server Comparisons