What are the introspection opcodes proposed in Kaspa's KIP-20?

Introspection opcodes are special script commands proposed in KIP-20 that let Kaspa's script engine examine covenant-related inputs and outputs inside the transaction being spent — without requiring parent or grandparent transaction data to be supplied as extra witness material. In most blockchain scripting systems, letting a script ask 'what else is in this transaction?' means dragging in expensive historical transaction data. Kaspa's introspection opcodes give scripts built-in commands to answer those questions directly at spend time, keeping transactions lean. For beginners, this means developers building covenant-based applications on Kaspa can write smarter, safer spending rules without bloating every transaction with extra data.