Web3.js V1 To V3 Migration

For human-facing background, see docs/web3js-v1-to-v3-migration.md. This skill is the execution-oriented companion for agents fixing code.

If the migration also touches @solana/spl-token usage (token instructions, ATAs, mint/account fetches), read reference/spl-token.md for that surface — it covers @solana/spl-token → @solana-program/token while staying on the v3 Connection/Transaction/Keypair API. Load it as soon as Fast Triage (below) turns up any @solana/spl-token imports.

Target Versions

Migrate to these versions (or newer) so the Kit interop below works without adapters: