calc_black_scholes_ultima
AI agents call calc_black_scholes_ultima to retrieve information from Black-Scholes MCP Server 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—computing the 'Ultima' Greek (a derivative sensitivity measure) for European options. It has no side effects, does not modify data, and does not execute arbitrary code or external operations. While it is financial in nature, it is a pure calculation tool with no ability to move money, create obligations, or alter state.
From the tool's definition Tool name 'calc_black_scholes_ultima' follows the naming pattern of sibling tools (calc_black_scholes_*) which perform mathematical calculations (price, delta, gamma, theta, vega, etc.).
Attacks that exploit this kind of access
calc_black_scholes_ultima. It is categorised as a Read tool in the Black-Scholes MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Black-Scholes MCP Server MCP server in PolicyLayer and add a rule for calc_black_scholes_ultima: 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 Black-Scholes MCP Server. Nothing to install.
calc_black_scholes_ultima 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 calc_black_scholes_ultima 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 calc_black_scholes_ultima. 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.
calc_black_scholes_ultima is provided by the Black-Scholes MCP Server MCP server (walkingshamrock/black-scholes-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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