Calculate a percentage of a value.
AI agents call percentage to retrieve information from Calculator 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 mathematical calculation (percentage of a value) and returns a result. It reads/computes only, with no writes, deletions, execution of code, or financial transactions. Misuse potential is negligible as it only returns a numeric result.
From the tool's definition "Calculate a percentage of a value" — pure arithmetic computation with no side effects, data modification, or external operations.
Attacks that exploit this kind of access
Calculate a percentage of a value. It is categorised as a Read tool in the Calculator MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Calculator MCP Server MCP server in PolicyLayer and add a rule for percentage: 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 Calculator MCP Server. Nothing to install.
percentage 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 percentage 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 percentage. 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.
percentage is provided by the Calculator MCP Server MCP server (sathiya-moorthi/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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