Creating Hedera Agent Kit Policies

Policies are blocking validation rules layered on the BaseTool lifecycle. A policy checks the call at one or more stages and throws to abort execution — the error propagates back to the LLM agent. Use them to enforce thresholds, allowlists/blocklists, rate limits, business hours, compliance rules, etc.

Policies fire only for tools that extend BaseTool. A tool that implements the Tool interface directly without extending BaseTool bypasses policies entirely.

Policy vs. hook

AbstractPolicy extends AbstractHook, so policies live in the same Context.hooks array and run through the same lifecycle.