Search 6,940 Harmonized System (HS) tariff codes. HS codes are 6-digit international product classification codes used for customs declarations and duty calculations. The first 2 digits = chapter, 4 digits = heading, 6 digits = subheading. Use this tool when you need to: - Find the HS code for a ...
Risk signalsAccepts freeform code/query input (query)
Part of the FreightUtils MCP Server server.
Free to start. No card required.
AI agents call hs_code_lookup to retrieve information from FreightUtils MCP Server without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though hs_code_lookup only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"hs_code_lookup": {}
}
}See the full FreightUtils MCP Server policy for all 19 tools.
These attack patterns abuse exactly the kind of access hs_code_lookup gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Search 6,940 Harmonized System (HS) tariff codes. HS codes are 6-digit international product classification codes used for customs declarations and duty calculations. The first 2 digits = chapter, 4 digits = heading, 6 digits = subheading. Use this tool when you need to: - Find the HS code for a product (e.g., "laptop", "olive oil") - Get the tariff classification hierarchy (section → chapter → heading → subheading) - Browse HS sections (I through XXI) Provide a search term for description-based search, or an exact HS code for detailed lookup.. It is categorised as a Read tool in the FreightUtils MCP Server MCP Server, which means it retrieves data without modifying state.
Register the FreightUtils MCP Server MCP server in PolicyLayer and add a rule for hs_code_lookup: 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 FreightUtils MCP Server. Nothing to install.
hs_code_lookup 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 hs_code_lookup 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 hs_code_lookup. 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.
hs_code_lookup is provided by the FreightUtils MCP Server MCP server (freightutils-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 19 FreightUtils MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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