Option B matches the defining requirement: the company, rather than a managed agent harness, must own the orchestration loop . Amazon Bedrock AgentCore Runtime provides a serverless, purpose-built environment for hosting agents and tools while remaining framework agnostic. AWS explicitly supports agents created with frameworks such as LangGraph, Strands, and CrewAI as well as fully custom agents that use no agent framework.
AWS further distinguishes AgentCore Runtime from its managed harness by stating that with Runtime, the customer brings the agent code and “the orchestration loop is yours.” The custom application can therefore implement proprietary tool-selection logic, complex conversation-state transitions, specialized retry algorithms, proprietary telemetry, validation stages, and any other control-flow behavior required by the business. Runtime supplies infrastructure capabilities such as isolation, scaling, sessions, authentication, and observability plumbing rather than taking ownership of the decision loop.
Amazon Bedrock can separately provide managed foundation-model inference, allowing the company to use Bedrock FMs without deploying or operating model-serving infrastructure.
A is incorrect specifically because of its final statement. AgentCore Policy is an authorization mechanism, not an orchestration or retry engine. AWS documents that Policy evaluates Cedar or Dogwood policies to determine whether tool invocations are permitted or forbidden. It can govern which actions are authorized, but it does not implement an agent ' s tool-selection algorithm or failure-retry strategy.
C relinquishes precisely the orchestration control the company requires by depending on managed behavior. D could provide deterministic workflow coordination but places Step Functions outside the agent loop and is cumbersome for highly dynamic multi-turn agent reasoning, proprietary state transitions, and tool-selection decisions.
Therefore, B preserves complete application-level orchestration control while outsourcing scalable runtime infrastructure and foundation-model inference to AWS.
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