AWS just shipped AgentCore Harness in public preview. It solves the infrastructure problem every team building AI agents has been re-solving from scratch (compute, memory, tool connectivity, observability), and it solves it well. You declare a config; you get a running agent.

It does not solve governance. That's a separate layer, and it's the layer where most agent failures actually happen.

What AgentCore Harness is

Every AI agent runs an orchestration loop: call the model, pick a tool, pass results back, manage context, handle failures. That loop needs infrastructure under it: compute, sandboxing, secure tool connections, persistent storage, identity, observability. That stack is the "harness." Until AgentCore, every team built it from scratch.

AgentCore Harness replaces that build with a configuration. You declare what your agent does (model, tools, instructions), and AWS handles the rest.

Available in: US West (Oregon), US East (N.…