Calculate reverse charge GST on imported services from overseas suppliers. Under Singapore's reverse charge mechanism, GST-registered businesses must account for GST on imported B2B services. Returns GST payable, input tax claim eligibility, and net cost. Use this tool when a business imports ser...
Part of the Sg Gst Calculator server.
Free to start. No card required.
AI agents use calculate_reverse_charge to initiate financial transactions through Sg Gst Calculator. Financial operations involve real money and are irreversible once processed. PolicyLayer blocks financial tools by default, requiring explicit human approval with transaction-level limits to prevent unauthorised spending.
calculate_reverse_charge moves real money. Without a policy, an autonomous agent could initiate transactions that drain accounts or exceed budgets. PolicyLayer blocks financial tools by default, requiring human-in-the-loop approval with configurable spending limits per transaction and per time window.
Financial tools involve real money. Block by default and require explicit human approval before enabling.
{
"version": "1",
"default": "deny",
"tools": {
"calculate_reverse_charge": {
"deny_if": [
{
"conditions": [],
"on_deny": "Requires human approval."
}
]
}
}
}See the full Sg Gst Calculator policy for all 4 tools.
These attack patterns abuse exactly the kind of access calculate_reverse_charge gives an agent. Each links to the full case and the policy that stops it:
Other financial tools across the catalogue. The same approach applies to each: deny by default, or require human approval.
Calculate reverse charge GST on imported services from overseas suppliers. Under Singapore's reverse charge mechanism, GST-registered businesses must account for GST on imported B2B services. Returns GST payable, input tax claim eligibility, and net cost. Use this tool when a business imports services from overseas and needs to determine GST obligations.. It is categorised as a Financial tool in the Sg Gst Calculator MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
Register the Sg Gst Calculator MCP server in PolicyLayer and add a rule for calculate_reverse_charge: 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 Sg Gst Calculator. Nothing to install.
calculate_reverse_charge is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the calculate_reverse_charge 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 calculate_reverse_charge. 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.
calculate_reverse_charge is provided by the Sg Gst Calculator MCP server (vdineshk/sg-gst-calculator-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 4 Sg Gst Calculator tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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