Mental models the SDK assumes.
FHE on chain is unfamiliar even to senior wallet devs. The concept pages cover what a handle is, when ACL grants happen, how the encryptor gets wired, and how to catch typed errors — everything you need to read the rest of the docs without losing the thread.
What is FHEVM?
Fully-homomorphic encryption on chain — what a handle is, why amounts stay opaque, why @zama-fhe/sdk and @zama-fhe/react-sdk are optional peer deps.
The encryptor source pattern
Eager vs lazy injection of the Zama relayer. CLAUDE.md Pitfall #3 spelled out so the next dev doesn't trip over context lifetime.
Encrypted inputs + handles
EncryptedInput, EncryptedHandle, EncryptedViewResult — what they wrap and which path each takes through the SDK.
Typed errors + recovery
SDK-level vs product-level vs the ContractRevertError generic fallback — how to catch a class, how to recover.
Scale-ratio math
FHE_SPLIT_DENOMINATOR, share(), scaleRatio() — the bigint arithmetic that keeps splits exact.
Branded primitives
asVestingId, asAirdropId, asDisperseId — why we wrap Hex strings in nominal types.
Preflight checks
PreflightResult — when to run, what it catches, how to surface its hints in your UI.
ACL grants + disclosure
FHE ACL is append-only. Operators + disclose hooks + the FHE.allow primitive.
Supported chains + addresses
DEPLOYED_ADDRESSES, chain overrides, the Sepolia / mainnet matrix.
SDK telemetry
SdkTelemetry interface, recommended event tags, plug-your-own adapter pattern.