Calculate Macaulay duration for bond
AI agents call bond_duration to retrieve information from Excel Finance MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only financial calculation (Macaulay duration) on bond parameters. It does not move money, modify data, or execute commands — it simply computes and returns a duration metric. No side effects are expected.
From the tool's definition 'Calculate Macaulay duration for bond' — purely a calculation/query operation returning a numerical result
Attacks that exploit this kind of access
Calculate Macaulay duration for bond. It is categorised as a Read tool in the Excel Finance MCP MCP Server, which means it retrieves data without modifying state.
Register the Excel Finance MCP server in PolicyLayer and add a rule for bond_duration: 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 Excel Finance MCP. Nothing to install.
bond_duration 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 bond_duration 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 bond_duration. 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.
bond_duration is provided by the Excel Finance MCP server (jeremycharlesgillespie/excel-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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