Trade-offs in Agent Harness Design
goyalshaliniuk · x · 2026-07-11
This post paraphrases Lilian Weng's blog and offers insights on agent evaluation and harness design:
- Many past papers claiming "agents don't work" relied on GPT-4 era models, which were simply not strong enough, making even failures hard to identify.
- The author argues that programming languages themselves are better deterministic context engineering tools, as they are more suited for expressing rules, states, and check logic.
- It is further speculated that future general-purpose harnesses (like Claude Code or Codex) might lose to specialized harnesses, because being "general" dilutes targeted effectiveness.
Related event: Optimizing Agent Harnesses Cuts Costs More Than Upgrading Models(6 posts)→
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