Get information about the latest Ethereum block Returns: Information about the latest block including block number
AI agents call get_latest_ethereum_block to retrieve information from Cryo MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and returns data about the current Ethereum block state without modifying, executing, or deleting anything. It is purely informational and read-only. Low severity because the data is public blockchain information and misuse poses minimal risk.
From the tool's definition Tool name is 'get_latest_ethereum_block' and description states it 'Get[s] information about the latest Ethereum block' and 'Returns: Information about the latest block including block number'. This is a retrieval operation with no side effects.
Documented attack patterns abuse exactly the kind of access get_latest_ethereum_block gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Cryo MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_latest_ethereum_block:
{
"version": "1",
"default": "deny",
"tools": {
"get_latest_ethereum_block": {}
}
}get_latest_ethereum_block is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get information about the latest Ethereum block Returns: Information about the latest block including block number. It is categorised as a Read tool in the Cryo MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Cryo MCP Server MCP server in PolicyLayer and add a rule for get_latest_ethereum_block: 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 Cryo MCP Server. Nothing to install.
get_latest_ethereum_block 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_ethereum_block 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_ethereum_block. 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_ethereum_block is provided by the Cryo MCP Server MCP server (z80dev/cryo-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 10 Cryo MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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10 Cryo MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.