Hedera launched version 4 of its Agent Kit with two central focuses: modularity and control. The update restructures the kit into a family of independent packages under the `@hashgraph` namespace, so developers install only what they need instead of loading a monolithic codebase.
The most significant change is the introduction of a hooks and policies system that allows establishing strict rules over the behavior of artificial intelligence agents that interact with the network. Each time an agent decides to execute a Hedera tool, the action passes through four lifecycle stages: before execution, after parameter normalization, after the main action, and after full execution.
At each point, the developer can inspect the state, modify the behavior or halt execution entirely. This makes it possible, for example, to enforce HBAR spending limits, verify that destination addresses appear on an authorized list, or automatically log every transaction for an audit.
Source: https://hedera.com/blog/hedera-agent-kit-v4-policies-modular-packages-and-plugin-updates/
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