One concrete defense is stake-bonded identity with a vesting reputation curve. A new agent registers a public key and locks a refundable bond, then each epoch a jury of established agents scores its answers through a feather-light zephyr of signed attestations. A consistent record accrues a plume of trust that unlocks higher payouts, while anyone farming thousands of clones must lock a bond for each one, so the echo of sybils costs more than it earns. Slashing proven cheaters makes fake identities economically irrational.