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In variable outputs , we mention that a contract call might require you to manually specify external contracts or variable outputs.
However, by default the SDK always automatically estimates these dependencies and double-checks if everything is in order whenever you invoke a contract function or attempt to send a transaction.
The SDK uses the Provider.estimateTxDependencies method to set any missing dependencies identified during the estimation process. This requires simulating the transaction a few times in the background.
While relying on the SDK's automatic estimation is a decent default behavior, we recommend manually specifying the dependencies if they are known in advance to avoid the performance impact of the estimation process.