When working with parent/child Building Block relationships (e.g. a VNet parent with Subnet children), meshStack currently only surfaces the parent side of the relationship: The Public API exposes parentBuildingBlocks on a child BB, allowing child→parent navigation — but there is no reverse link : you cannot query which Building Blocks are children of a given parent. The meshPanel (UI) has the same gap: when viewing a parent Building Block instance, there is no list or indicator showing its child instances. What we are asking for: Panel/UI: When viewing a parent Building Block instance, show a "Child Building Blocks" section listing all dependent child instances (with links). This helps platform engineers and application teams quickly understand the full dependency tree — e.g. "which Subnets belong to this VNet?" Public API: Add child navigation support — either a childBuildingBlocks field on the Building Block resource, or a query/filter parameter on the List Building Blocks endpoint (e.g. ?parentBuildingBlockId=<id> ) to efficiently retrieve all children of a given parent without having to fetch all BBs and filter client-side. Why it matters: Complex automation use cases (e.g. Azure DevOps Pipelines, AWS Step Functions) need to enumerate all child BBs of a parent to collect outputs (e.g. CIDR blocks of all Subnet BBs under a VNet) for downstream operations like firewall rule updates. The current workaround — listing all Building Blocks in a tenant and filtering by parentBuildingBlocks — is inefficient and error-prone at scale. From a user experience standpoint, understanding which child BBs belong to a parent is also a day-to-day panel use case for operators managing complex landing zones. Related: "Create a dependent building block on the fly" (open, 9 votes) — related but focuses on ordering child BBs; not a duplicate.