Convert an amount between any currency and SGD using MAS reference rates. Use this tool when you need to convert money amounts for contracts, invoices, or financial reporting in Singapore.
Part of the Sg Finance Data server.
Free to start. No card required.
AI agents call calculate_currency_conversion to retrieve information from Sg Finance Data 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 calculate_currency_conversion 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": {
"calculate_currency_conversion": {}
}
}See the full Sg Finance Data policy for all 4 tools.
These attack patterns abuse exactly the kind of access calculate_currency_conversion 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.
Convert an amount between any currency and SGD using MAS reference rates. Use this tool when you need to convert money amounts for contracts, invoices, or financial reporting in Singapore.. It is categorised as a Read tool in the Sg Finance Data MCP Server, which means it retrieves data without modifying state.
Register the Sg Finance Data MCP server in PolicyLayer and add a rule for calculate_currency_conversion: 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 Finance Data. Nothing to install.
calculate_currency_conversion 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 calculate_currency_conversion 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_currency_conversion. 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_currency_conversion is provided by the Sg Finance Data MCP server (vdineshk/sg-finance-data-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 Finance Data tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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