Codex Pets vs Impact Preview

In-depth architectural comparison of the Codex Pets and Impact Preview 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?

Choose Codex Pets when:

• You need dedicated capabilities in the Developer Tools domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).
• Primary tools included: Public read-only MCP access, Approved pet search and detail lookup, Pet installation instructions.

Explore Codex Pets Details

Choose Impact Preview when:

• You need dedicated capabilities in the Developer Tools domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: API Key required (Free / Open Source).
• You have access to required keys: SECRET_KEY, DATABASE_URL, REDIS_URL.
• Primary tools included: File write and delete previews, Shell command risk checks, Path risk assessment.

Feature & Specification Comparison

Specification	Codex Pets astandrik Developer Tools	Impact Preview Developer Tools
Summary	Companion Gallery for Codex: public read-only registry for Codex-compatible animated companion packs. Search, preview, install community pets, generate badges/embed cards, and discover the request flow via Streamable HTTP MCP.	Impact preview for AI agents - see what changes before any action executes.
Category & Scope	Developer Tools

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": {
    "astandrik-codex-pets": {
      "command": "npx",
      "args": [
        "-y",
        "@astandrik/codex-pets"
      ]
    }
  }
}

{
  "mcpServers": {
    "impact-preview": {
      "command": "uvx",
      "args": [
        "impact-preview"
      ],
      "env": {
        "SECRET_KEY": "YOUR_SECRET_KEY_HERE",
        "DATABASE_URL": "YOUR_DATABASE_URL_HERE",
        "REDIS_URL": "YOUR_REDIS_URL_HERE"
      }
    }
  }
}

Related MCP Server Comparisons