compute_ev
Compute EU261 expected value for a trip: net cost after compensation probability
This record as markdown: /tools/dev-danielsuchan-eu261/compute-ev.md
What compute_ev does on EU261 Flight Compensation
AI agents call compute_ev to retrieve information from EU261 Flight Compensation 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 |
|---|---|---|---|
origin | string | Yes | Origin IATA code |
fare_eur | number | Yes | Round-trip fare in EUR |
destination | string | Yes | Destination IATA code |
routing_type | string | Yes | Routing type — determines payable-delay probability |
Parameters from the server's own tool schema.
Why compute_ev is rated Low
This tool performs a calculation/computation based on input data to derive an expected value. It retrieves no external state and modifies nothing — it is purely a mathematical/analytical function. No side effects, no data written, no commands executed.
From the tool's definition Compute EU261 expected value for a trip: net cost after compensation probability
Risk signalsAccepts file system path (destination)
Attacks that exploit this kind of access
The rule that runs compute_ev safely
PolicyLayer is an MCP gateway: it sits between your AI agents and EU261 Flight Compensation, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For compute_ev, this is the rule to start with:
compute_ev 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 EU261 Flight Compensation, apply this rule, and every compute_ev call is checked against it from then on.
Questions about compute_ev
Compute EU261 expected value for a trip: net cost after compensation probability. It is categorised as a Read tool in the EU261 Flight Compensation MCP Server, which means it retrieves data without modifying state.
compute_ev accepts 4 parameters: origin, fare_eur, destination, routing_type. Required: origin, fare_eur, destination, routing_type. The full parameter table on this page comes from the server's own tool schema.
Register the EU261 Flight Compensation MCP server in PolicyLayer and add a rule for compute_ev: 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 EU261 Flight Compensation. Nothing to install.
compute_ev 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 compute_ev 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 compute_ev. 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.
compute_ev is provided by the EU261 Flight Compensation MCP server (https://eu261.danielsuchan.dev/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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