Read state from a Hedera smart contract - get contract info, bytecode size,
AI agents call contract_read to retrieve information from Hedera Toolbox without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves contract metadata and state information without modifying, executing, or destructing any data. It performs passive queries against the blockchain to fetch contract properties. While it is part of a paid blockchain system, the financial cost is metered access to queries, not a financial transaction itself (no money is moved by this tool).
From the tool's definition Tool name is 'contract_read' and description states 'Read state from a Hedera smart contract - get contract info, bytecode size'. The verb 'Read' and 'get' indicate retrieval operations with no side effects.
Attacks that exploit this kind of access
Read state from a Hedera smart contract - get contract info, bytecode size,. It is categorised as a Read tool in the Hedera Toolbox MCP Server, which means it retrieves data without modifying state.
Register the Hedera Toolbox MCP server in PolicyLayer and add a rule for contract_read: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Hedera Toolbox. Nothing to install.
contract_read is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the contract_read rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for contract_read. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
contract_read is provided by the Hedera Toolbox MCP server (mountainmystic/hederatoolbox). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
contract_read is one line of Hedera Toolbox's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
Teams ship this data inside their own products. See what a licence covers →