Subtract b from a.
AI agents call subtract to retrieve information from MCP Quickstart Weather Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a stateless mathematical function that retrieves/computes a result based on inputs. It has no capability to create, modify, delete data, execute external code, or cause financial transactions. The operation is deterministic and has no lasting effects beyond returning a computed value, making it equivalent to a read operation in terms of risk profile.
From the tool's definition Tool name 'subtract' and description 'Subtract b from a' indicate a pure mathematical operation that performs a calculation and returns a result without side effects, state changes, or data modification.
Attacks that exploit this kind of access
Subtract b from a. It is categorised as a Read tool in the MCP Quickstart Weather Server MCP Server, which means it retrieves data without modifying state.
Register the MCP Quickstart Weather Server 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 MCP Quickstart Weather Server. 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 MCP Quickstart Weather Server MCP server (veysby/mcp-quickstart). 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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