What is the key difference between Ratary and Penfield MCP?

Ratary belongs to the Knowledge & Memory category with local stdio execution, while Penfield MCP belongs to the Knowledge & Memory category with local stdio execution.

How do I install Ratary or Penfield MCP in Claude Desktop or Cursor?

Copy the mcpServers JSON configuration snippet provided on this page into your claude_desktop_config.json or ~/.cursor/mcp.json file and restart your AI client.

Are Ratary and Penfield MCP free or paid?

Ratary operates under a Free / Open Source model (API Key required). Penfield MCP operates under a Free / Open Source model (OAuth 2.0).

Which MCP server has more tools and community activity?

Ratary lists 6 tools with 3 views and 1 GitHub stars. Penfield MCP lists 6 tools with 3 views and 6 GitHub stars.

Can I use both Ratary and Penfield MCP together in the same MCP host?

Yes! MCP hosts like Claude Desktop, Cursor, Windsurf, Cline, and VS Code support configuring multiple servers under the mcpServers object simultaneously.

Side-by-Side Model Context Protocol Comparison

Ratary vs Penfield MCP

In-depth architectural comparison of the Ratary and Penfield 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.

At a Glance & Executive Verdict

Ratary

Knowledge & Memory · Local stdio

Quality: 49/100 (Fair) | Auth: API Key required

Penfield MCP

Knowledge & Memory · Local stdio

Quality: 49/100 (Fair) | Auth: OAuth 2.0

Verdict Summary: Choose Ratary if you need specialized Knowledge & Memory tools running via a local process. Choose Penfield MCP if your workspace requires Knowledge & Memory integration with local subprocess execution. Both servers can be configured concurrently in your client's mcpServers manifest.

Which MCP Server Should You Choose?

Choose Ratary when:

You need dedicated capabilities in the Knowledge & Memory domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: API Key required (Free / Open Source).
You have access to required keys: AUTH_SECRET, DATABASE_URL, SQL_PROVIDER, RATARY_BASE_URL, RATARY_API_KEY.
Primary tools included: Persistent versioned memory, Hybrid search and context assembly, Structured metadata and knowledge graphs.

Explore Ratary Details

Choose Penfield MCP when:

You need dedicated capabilities in the Knowledge & Memory domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: OAuth 2.0 (Free / Open Source).
Primary tools included: Persistent memory across sessions, Hybrid BM25, vector, and graph search, Knowledge graph with 24 relationship types.

Feature & Specification Comparison

Specification	Ratary ontorata Knowledge & Memory	Penfield MCP penfieldlabs Knowledge & Memory
Summary	Persistent coding memory for AI assistants — hybrid search, knowledge graph, token-efficient context. MCP stdio (28 tools), npm @ratary/mcp-server, optional remote Streamable HTTP. Self-host D1, Postgres, MariaDB, or Docker.	Penfield: persistent memory with hybrid search (BM25 + vector + graph), 24 relationship types for knowledge graphs, context checkpoints for cognitive handoff, artifact storage, and personality system. Works across Claude, Cursor, Windsurf, and any MCP client.
Category & Scope

Tools & Capabilities Breakdown

Ratary Tools (6)

Persistent versioned memory

Hybrid search and context assembly

Structured metadata and knowledge graphs

28 MCP tools

Self-hosted SQL storage

Optional remote Streamable HTTP

Penfield MCP Tools (6)

Persistent memory across sessions

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).

Ratary Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "ontorata-ratary": {
      "command": "npx",
      "args": [
        "-y",
        "@ratary/mcp-server@1.1.3"
      ],
      "env": {
        "AUTH_SECRET": "YOUR_AUTH_SECRET_HERE",
        "DATABASE_URL": "YOUR_DATABASE_URL_HERE",
        "SQL_PROVIDER": "YOUR_SQL_PROVIDER_HERE",
        "RATARY_BASE_URL": "YOUR_RATARY_BASE_URL_HERE",
        "RATARY_API_KEY": "YOUR_RATARY_API_KEY_HERE"
      }
    }
  }
}

Penfield MCP Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "penfieldlabs-penfield-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-remote"
      ]
    }
  }
}

Frequently Asked Questions

Ratary is categorized under Knowledge & Memory and uses a local stdio subprocess. In contrast, Penfield MCP belongs to Knowledge & Memory using local stdio subprocess. Select Ratary when you need capabilities focused on knowledge & memory and Penfield MCP when you require tools for knowledge & memory.

More alternatives to Ratary More alternatives to Penfield MCP Knowledge & Memory category hub