Representative Agent Harnesses

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1. Why Compare These Systems

2. Breaking Down the Four Systems

2.1 SWE-agent: The Interface Is the Performance

2.2 OpenHands: An Event-Stream Open Platform

2.3 Claude Code: Single Loop + Minimalism

2.4 GitHub Copilot Coding Agent: An Agent Embedded in CI

3. Side-by-Side Comparison

4. Shared Design Trade-offs

5. Selection Guidance

6. References