Perenna vs Witness

In-depth architectural comparison of the Perenna and Witness 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?

P

Choose Perenna when:

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

Explore Perenna Details

Choose Witness when:

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

Explore Witness Details

Feature & Specification Comparison

Specification	P Perenna Knowledge & Memory	Witness Knowledge & Memory
Summary	A lightweight, Git-backed permanent memory for AI agents.	Second brain for Claude Code & OpenCode: distills how your patterns and knowledge evolve over time.
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": {
    "perenna": {
      "command": "uvx",
      "args": [
        "vexor"
      ]
    }
  }
}

{
  "mcpServers": {
    "witness": {
      "command": "npx",
      "args": [
        "-y",
        "witness"
      ]
    }
  }
}

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