Harness ≠ infrastructure: sandboxing and persistence belong to a different layer
blaizedsouza · x · 2026-10-14
In a discussion on what an AI harness actually does, bibryam pushes back on lists that conflate harness capabilities with infrastructure. Checkpointing, persistence, and sandboxing don't necessarily belong to the harness — systems like Cloudflare and Agent Substrate (5.1k stars on GitHub) provide secure sandboxes, state persistence, and suspend/resume without prescribing the agent loop, tools, or context management. The core of harness engineering, he argues, is improving agent performance through planning, execution strategies, verification, and feedback loops.
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