Note

Medium Risk
Breaking TypeScript types for configs.networks and lookup parameters require consumer updates; runtime behavior is mostly unchanged aside from stricter chain ID validation on API responses.

Overview
BREAKING: Network configs in controller state are now keyed and typed as CaipChainId instead of arbitrary strings. ConfigRegistryControllerState.configs.networks becomes Record<CaipChainId, RegistryNetworkConfig>, and getNetworkConfigByCaip2ChainId takes a CaipChainId argument.

Registry API parsing now validates each chain’s chainId with CaipChainIdStruct from @metamask/utils, so only CAIP-2-shaped IDs (e.g. eip155:1) are accepted at the type/schema layer. The changelog documents the breaking state shape change and ties it to the existing lookup API.

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