Hedera Policy Creation

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

Goal	Use
Stop a call when a condition holds	Policy (this skill)
Reject specific tool methods	Policy
Threshold / rate-limit / allowlist / blocklist	Policy
Log, audit, enrich context	Hook (see agent-kit-hook skill)

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