Engineer the post-launch operating layer: trace analysis linking agent decisions back to source documents and prompt versions, token and cost telemetry per agent run, SLO dashboards (latency, cost, throughput), drift detection, and handoff packages (runbooks, monitoring, documentation) so business owners can run what was built. Agent systems: multi-agent orchestration on LangGraph and LangGraph Platform (AutoGen or equivalent), durable workflow state, declarative agent configuration, tool and API integration, agent interoperability (MCP, agent-to-agent handoffs), and vendor SDKs and agent development kits (AWS Bedrock, OpenAI, Anthropic).