Calcule l
AI agents call simuler_revenus_exceptionnels to retrieve information from Impots without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool appears to calculate or simulate tax scenarios for exceptional income—a common use case in tax advisory. Simulation and calculation tools that compute figures without creating, modifying, or executing side effects fall under Read. The truncated description prevents full certainty, but the pattern across sibling tools (calculer_*, analyser_*) are all analytical functions.
From the tool's definition Tool name 'simuler_revenus_exceptionnels' indicates simulation/calculation of exceptional income. Description is truncated ('Calcule l'), but the 'simuler' (simulate) prefix and context among peer tools (all calculation/analysis functions) suggest this…
Documented attack patterns abuse exactly the kind of access simuler_revenus_exceptionnels gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Impots, and nothing reaches the server without passing your rules. This is the rule we recommend for simuler_revenus_exceptionnels:
{
"version": "1",
"default": "deny",
"tools": {
"simuler_revenus_exceptionnels": {}
}
}simuler_revenus_exceptionnels is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Calcule l. It is categorised as a Read tool in the Impots MCP Server, which means it retrieves data without modifying state.
Register the Impots MCP server in PolicyLayer and add a rule for simuler_revenus_exceptionnels: 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 Impots. Nothing to install.
simuler_revenus_exceptionnels 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 simuler_revenus_exceptionnels 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 simuler_revenus_exceptionnels. 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.
simuler_revenus_exceptionnels is provided by the Impots MCP server (w4zu/impots-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Impots, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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