Two Agents, One MCP Server: Using a Second Claude as a Harness for the First (opens in new tab)

--- title: "Two Agents, One MCP Server: Using a Second Claude as a Harness for the First" date: 2026-05-25 category: development tags: ["ai", "mcp", "claude-code", "testing", "harness-engineering", "differential-testing", "cloudflare", "tax"] description: "How to test AI-generated code: a differential-testing pattern over MCP. One agent built\nmy Polish tax calculator and exposed it over MCP. A second Claude Code agent, with no\nshared context, audited the math against raw broker data and fou...