Retrieve detailed information about a specific Nano block.
AI agents call block_info to retrieve information from Nano Currency MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only retrieves and queries blockchain data about a specific block. It performs no modifications, deletions, transfers, or code execution. The highest risk is information disclosure, which is minimal for public blockchain data. The sibling tools include destructive financial operations (nano_send, raw_send), but this tool itself is purely read-only.
From the tool's definition Tool name is 'block_info' and description states 'Retrieve detailed information about a specific Nano block' — a pure query operation with no side effects.
Documented attack patterns abuse exactly the kind of access block_info gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Nano Currency MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for block_info:
{
"version": "1",
"default": "deny",
"tools": {
"block_info": {}
}
}block_info is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Retrieve detailed information about a specific Nano block. It is categorised as a Read tool in the Nano Currency MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Nano Currency MCP Server MCP server in PolicyLayer and add a rule for block_info: 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 Nano Currency MCP Server. Nothing to install.
block_info 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 block_info 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 block_info. 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.
block_info is provided by the Nano Currency MCP Server MCP server (kilkelly/nano-currency-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Nano Currency MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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6 Nano Currency MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.