Agent Harness explained: the shift from developer-run frameworks to platform-managed runtimes
adnan_hashmi · x · 2026-11-08
A post explaining the concept of an AI Agent Harness, with a diagram contrasting two models:
- Framework Harness: instructions, skills, and tools sit on top of an agent runtime that the developer runs and maintains.
- Managed Harness: the same application-specific layer, but the agent runtime is operated by the platform.
The key insight is the shift in ownership: agent runtimes are moving from developer-managed frameworks to platform-operated infrastructure, echoing the earlier evolution from self-managed servers to managed cloud. The post links out for details and works as a concise conceptual primer.
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