ICON (wallet-sdk-core granular skill)

Granular skill for IconWalletProvider — the low-level ICON wallet for backend / Node / non-React flows. Source-of-truth reference lives in the parent broad skill's knowledge tree; this file is the focused workflow only.

Step 1 — Clarify with user before coding

1. New code or v1 → v2 port? New → § Integration. Port v1 → § Migration (almost always a no-op here).
2. Private-key or browser-extension config? ICON discriminates by field presence (no type): PK = { privateKey, rpcUrl }; browser-extension = { walletAddress?, rpcUrl } (targets Hana via postMessage). rpcUrl is required in both modes — no public-RPC fallback.
3. Scripted determinism? In browser-extension mode pass walletAddress explicitly (else the provider issues a REQUEST_ADDRESS event on first use).

Integration workflow (new v2 code)

1. ../integration/knowledge/ai-rules.md — DO / DON'T (read first).
2. ../integration/knowledge/architecture.md — BaseWalletProvider, dual-config discriminants, shallow defaults merge, library-exports.
3. ../integration/knowledge/features/icon.md — full config union, IconWalletDefaults, methods (sendTransaction / waitForTransactionReceipt), gotchas.
4. Setup recipe → ../integration/knowledge/recipes/setup-private-key.md or ../integration/knowledge/recipes/setup-browser-extension.md; then ../integration/knowledge/recipes/sign-and-broadcast.md, ../integration/knowledge/recipes/defaults-and-overrides.md.
5. Lookups → ../integration/knowledge/reference/provider-classes.md, interfaces.md, chain-support.md.

ICON-specific anti-patterns