AI agents call get_bridge_fees 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.
This tool retrieves fee information for bridge transfers without executing any transactions, modifying data, or triggering external operations. It is a simple query that provides informational data to the user for decision-making purposes. There are no side effects or state changes. The low severity reflects minimal risk even if misused—an agent could only retrieve fee data, not execute transfers or move funds.
From the tool's definition Tool name 'get_bridge_fees' and description 'Get detailed fee breakdown for a bridge transfer' indicate a query/retrieval operation. The verb 'Get' and lack of any modification or execution language confirms read-only data retrieval.
Documented attack patterns abuse exactly the kind of access get_bridge_fees 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 get_bridge_fees:
{
"version": "1",
"default": "deny",
"tools": {
"get_bridge_fees": {}
}
}get_bridge_fees is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get detailed fee breakdown for a bridge transfer. 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 get_bridge_fees: 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.
get_bridge_fees 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_bridge_fees 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_bridge_fees. 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_bridge_fees 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.