Runtime capability deep dives

Status: Draft chapters (one per row in Production requirements and runtime capabilities). Each page lists scope, design questions, tradeoffs, and evaluation hooks without prescribing a single vendor stack.

Production requirement	Draft chapter
Reliability	Durable execution
Memory	Checkpoints and store
Guardrails	Middleware and policy hooks
Multi-tenancy	Auth, isolation, and RBAC
Human oversight	Human-in-the-loop
Real-time interaction	Streaming and concurrency
Observability	Tracing and time travel
Code execution	Sandboxes
Integrations	MCP, A2A, and webhooks
Scheduled jobs	Cron and proactive runs

Primary reference: LangChain runtime article.