Opus 5.5 vs Build

In-depth architectural comparison of the Opus 5.5 and Build 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?

O

Choose Opus 5.5 when:

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

Explore Opus 5.5 Details

Choose Build 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: Schema-validated structured JSON output, Human-readable MCP content output, TypeScript compiler support.

Explore Build Details

Feature & Specification Comparison

Specification	O Opus 5.5 Developer Tools	Build Developer Tools
Summary	Authenticated async Opus 5.5 agent with status polling and artifact results.	Structured build tool output (tsc, generic commands) as typed JSON diagnostics.
Category & Scope	Developer Tools	Developer Tools
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": {
    "opus-5-5": {
      "url": "https://farm.llmotions.com/marketplaces/agents/opus-5-5/mcp/access"
    }
  }
}

{
  "mcpServers": {
    "build": {
      "command": "npx",
      "args": [
        "-y",
        "@paretools/init"
      ]
    }
  }
}

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