AI agents call hex_to_number to retrieve information from BNB Chain MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Hex-to-decimal conversion is a read-only utility that transforms input data into a different representation without retrieving external data, modifying state, or executing code. It poses minimal risk even if misused by an AI agent, as the worst outcome would be an incorrect numerical interpretation.
From the tool's definition Tool performs a simple conversion operation: 'Convert a hex string to a decimal number'. This is a pure computation with no side effects, no data modification, and no external state changes.
Documented attack patterns abuse exactly the kind of access hex_to_number gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and BNB Chain MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for hex_to_number:
{
"version": "1",
"default": "deny",
"tools": {
"hex_to_number": {}
}
}hex_to_number is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Convert a hex string to a decimal number. It is categorised as a Read tool in the BNB Chain MCP MCP Server, which means it retrieves data without modifying state.
Register the BNB Chain MCP server in PolicyLayer and add a rule for hex_to_number: 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 BNB Chain MCP. Nothing to install.
hex_to_number 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 hex_to_number 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 hex_to_number. 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.
hex_to_number is provided by the BNB Chain MCP server (nirholas/bnbchain-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 1240 BNB Chain MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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1240 BNB Chain MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.