Returns the hash of the latest block
AI agents call get_latest_hash to retrieve information from MCP Blockchain Query Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves blockchain data (the latest block hash) from a public, immutable ledger. It performs no writes, deletions, code execution, or financial transactions. It is a straightforward read operation with minimal risk if misused, as the data is already public and immutable on the blockchain.
From the tool's definition Tool name 'get_latest_hash' and description 'Returns the hash of the latest block' indicate a retrieval operation with no side effects. The verb 'Returns' confirms data querying without modification or execution.
Attacks that exploit this kind of access
Returns the hash of the latest block. It is categorised as a Read tool in the MCP Blockchain Query Server MCP Server, which means it retrieves data without modifying state.
Register the MCP Blockchain Query Server MCP server in PolicyLayer and add a rule for get_latest_hash: 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 MCP Blockchain Query Server. Nothing to install.
get_latest_hash 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 get_latest_hash 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 get_latest_hash. 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.
get_latest_hash is provided by the MCP Blockchain Query Server MCP server (pavel-bc/mcp-blockchain-query). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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