Check if a business must register for Singapore GST based on taxable turnover. Tests both retrospective (past 12 months > $1M) and prospective (next 12 months expected > $1M) thresholds. Returns registration requirement, penalty information, and voluntary registration options. Use this tool when ...
Part of the Sg Gst Calculator server.
Free to start. No card required.
AI agents call check_gst_registration to retrieve information from Sg Gst Calculator without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though check_gst_registration only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"check_gst_registration": {}
}
}See the full Sg Gst Calculator policy for all 4 tools.
These attack patterns abuse exactly the kind of access check_gst_registration gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Check if a business must register for Singapore GST based on taxable turnover. Tests both retrospective (past 12 months > $1M) and prospective (next 12 months expected > $1M) thresholds. Returns registration requirement, penalty information, and voluntary registration options. Use this tool when advising businesses on GST registration obligations.. It is categorised as a Read tool in the Sg Gst Calculator MCP Server, which means it retrieves data without modifying state.
Register the Sg Gst Calculator MCP server in PolicyLayer and add a rule for check_gst_registration: 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.
check_gst_registration 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 check_gst_registration 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 check_gst_registration. 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.
check_gst_registration 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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