Subtracts two numbers and returns the result.
AI agents call subtract to retrieve information from FastMCP Beginner MCP Servers without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The subtract tool performs a stateless arithmetic calculation. It takes two numeric inputs, computes their difference, and returns the result. There is no data modification, code execution, deletion, or financial impact. This is categorized as Read because it simply computes and returns a value without side effects, similar to a query operation.
From the tool's definition Tool name is 'subtract' and description states it 'Subtracts two numbers and returns the result.' This is a pure mathematical operation that retrieves a computed value with no side effects on any data or system state.
Attacks that exploit this kind of access
Subtracts two numbers and returns the result. It is categorised as a Read tool in the FastMCP Beginner MCP Servers MCP Server, which means it retrieves data without modifying state.
Register the FastMCP Beginner MCP Servers 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 Beginner MCP Servers. 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 Beginner MCP Servers MCP server (papasmurf79/mcpserverproject). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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