Subtract two numbers.
AI agents call subtract to retrieve information from FastMCP Tools Calculator without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The subtract tool is a simple arithmetic function that takes two numbers as inputs and returns their difference. It has no ability to modify state, execute arbitrary code, access external systems, or cause irreversible changes. It reads inputs and returns a calculated output, making it a Read-category tool. Severity is low because even if misused by an AI agent, arithmetic operations pose minimal security risk.
From the tool's definition Tool performs 'Subtract two numbers' - a pure mathematical operation that retrieves a computed result without side effects, data modification, or external operations.
Attacks that exploit this kind of access
Subtract two numbers. It is categorised as a Read tool in the FastMCP Tools Calculator MCP Server, which means it retrieves data without modifying state.
Register the FastMCP Tools Calculator MCP server in PolicyLayer and add a rule for subtract: 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 FastMCP Tools Calculator. Nothing to install.
subtract 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 subtract 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 subtract. 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.
subtract is provided by the FastMCP Tools Calculator MCP server (sriharsha-inthub/mcp-applications). 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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