Harness Engineering: Building the Production Cage for Powerful Domain Agents — Mike Chambers, AWS
A production agent's harness is everything around the model: tools, memory, runtime, isolation, and deployment controls. The practical lesson is to standardize that layer across agents.
Chambers defines the harness as everything left after removing the model from an agent: tools, MCP connections, memory, loop management, runtime, and operational controls. His AWS demo moves from a local Strands agent to AgentCore with **short- and long-term memory** and multi-tenant isolation.
Make harness choices explicit and reusable across coding agents and agents you ship. Keep cloud changes in infrastructure as code, separate memory from the running process when appropriate, and adopt only the managed components your existing agent lacks.
Chambers defines the harness as everything left after removing the model from an agent: tools, MCP connections, memory, loop management, runtime, and operational controls. His AWS demo moves from a local Strands agent to AgentCore with **short- and long-term memory** and multi-tenant isolation. Make harness choices explicit and reusable across coding agents and agents you ship. Keep cloud changes in infrastructure as code, separate memory from the running process when appropriate, and adopt only the managed components your existing agent lacks. The talk is an AWS-centered walkthrough rather than a cross-platform evaluation. Its suggestion that **80% of agent development** may already reduce to prompts and tools is presented as an argument, not measured evidence, and the operational tradeoffs are not quantified.
This consolidates tools, memory, loop control, runtime, and operations into one explicit harness boundary, then shows how selected pieces can move from a local agent into managed infrastructure with external memory and tenant isolation. It reinforces candidates that place permissions and validation outside prompts, while narrowing adoption guidance to incremental, reusable components rather than treating an AWS stack or a broad harness bundle as inherently better.