AI agents call calc_tip to retrieve information from UnClick without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
bill | number | Yes | |
split | number | — | |
tip_percent | number | — |
Parameters from the server's own tool schema.
The tool performs a stateless mathematical calculation (tip percentage applied to a bill amount). It retrieves no data, modifies nothing, executes no external commands, and has no destructive or financial impact—it merely returns a computed value to inform a user's decision. This is a classic Read category operation.
From the tool's definition Tool name is 'calc_tip' and description states it 'Calculate[s] tip amount and total for a bill.' This is a pure calculation function that reads input values and returns computed results with no side effects, modifications to data, or external operations.
Attacks that exploit this kind of access
Calculate tip amount and total for a bill. It is categorised as a Read tool in the UnClick MCP Server, which means it retrieves data without modifying state.
calc_tip accepts 3 parameters: bill, split, tip_percent. Required: bill. The full parameter table on this page comes from the server's own tool schema.
Register the UnClick MCP server in PolicyLayer and add a rule for calc_tip: 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 UnClick. Nothing to install.
calc_tip 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 calc_tip 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 calc_tip. 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.
calc_tip is provided by the UnClick MCP server (@unclick/mcp-server). 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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