percentage
Percentage Calculator — Percent-of, percent change, is-what-percent, increase/decrease and reverse-percent.
This record as markdown: /tools/com-wingmanprotocol-agent-gateway/percentage.md
What percentage does on Gateway
AI agents call percentage to retrieve information from Gateway without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
base | number | — | Base value (percent_of/increase/decrease) |
mode | string | Yes | Which calculation to run |
part | number | — | Part value (is_what_percent) |
total | number | — | Total after the percent was added (reverse_percent) |
whole | number | — | Whole value (is_what_percent) |
percent | number | — | Percent value (percent_of/increase/decrease/reverse_percent) |
to_value | number | — | Ending value (percent_change) |
from_value | number | — | Starting value (percent_change) |
Parameters from the server's own tool schema.
Why percentage is rated Low
This is a stateless calculator that performs percentage arithmetic operations (percent-of, percent change, increase/decrease, reverse-percent). It retrieves no data from persistent storage, creates no side effects, executes no external commands, and modifies nothing. It is purely computational, analogous to arithmetic operations.
From the tool's definition Tool name 'percentage' and description 'Percentage Calculator — Percent-of, percent change, is-what-percent, increase/decrease and reverse-percent' indicate pure mathematical calculations with no side effects, data modification, or external operations.
Attacks that exploit this kind of access
The rule that runs percentage safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Gateway, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For percentage, this is the rule to start with:
percentage is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Gateway, apply this rule, and every percentage call is checked against it from then on.
Questions about percentage
Percentage Calculator — Percent-of, percent change, is-what-percent, increase/decrease and reverse-percent. It is categorised as a Read tool in the Gateway MCP Server, which means it retrieves data without modifying state.
percentage accepts 8 parameters: base, mode, part, total, whole, percent, to_value, from_value. Required: mode. The full parameter table on this page comes from the server's own tool schema.
Register the Gateway 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 Gateway. 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 Gateway MCP server (https://wingmanprotocol.com/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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