Calcule et explique le taux de prélèvement à la source (PAS).
AI agents call calculer_prelevement_source 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 computes and explains French tax withholding rates (PAS - prélèvement à la source). It performs a calculation based on input parameters and returns informational output. There is no indication that it creates, modifies, executes code, deletes data, or commits financial obligations. It is a pure analytical/informational tool, consistent with the 'Read' category for retrieval and query operations.
From the tool's definition Tool name 'calculer_prelevement_source' and description 'Calcule et explique le taux de prélèvement à la source (PAS)' indicate calculation and explanation of tax withholding rates.
Documented attack patterns abuse exactly the kind of access calculer_prelevement_source 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 calculer_prelevement_source:
{
"version": "1",
"default": "deny",
"tools": {
"calculer_prelevement_source": {}
}
}calculer_prelevement_source is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Calcule et explique le taux de prélèvement à la source (PAS). 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 calculer_prelevement_source: 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.
calculer_prelevement_source 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 calculer_prelevement_source 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 calculer_prelevement_source. 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.
calculer_prelevement_source 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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62 Impots tools catalogued and risk-classified — across an index of 43,000+ MCP servers.