Get US Treasury interest rates including yield curve, bill rates, and long-term rates. No API key required.
AI agents call treasury_rates to retrieve information from Publicfinance without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only retrieves publicly available US Treasury rate data. It performs no writes, deletions, executions, or financial transactions. The worst outcome from misuse would be providing stale or incorrect rate information to an agent, which is a read-only risk with minimal blast radius. The data accessed is non-sensitive public information already published by the US Treasury.
From the tool's definition Tool description states 'Get US Treasury interest rates' - a retrieval operation with no modification, deletion, or execution capability. Treasury rate data is publicly available financial information.
Attacks that exploit this kind of access
Get US Treasury interest rates including yield curve, bill rates, and long-term rates. No API key required. It is categorised as a Read tool in the Publicfinance MCP Server, which means it retrieves data without modifying state.
Register the Publicfinance MCP server in PolicyLayer and add a rule for treasury_rates: 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 Publicfinance. Nothing to install.
treasury_rates 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 treasury_rates 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 treasury_rates. 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.
treasury_rates is provided by the Publicfinance MCP server (leviai-ai/publicfinance-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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