Compare multiple currencies over a time period. Shows current rates and historical performance statistics for multiple currencies against a base currency. Useful for analyzing currency trends.
Part of the Tcmb server.
Free to start. No card required.
AI agents call tcmb_compare_currencies to retrieve information from Tcmb 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 tcmb_compare_currencies 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": {
"tcmb_compare_currencies": {}
}
}See the full Tcmb policy for all 6 tools.
These attack patterns abuse exactly the kind of access tcmb_compare_currencies 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.
Compare multiple currencies over a time period. Shows current rates and historical performance statistics for multiple currencies against a base currency. Useful for analyzing currency trends.. It is categorised as a Read tool in the Tcmb MCP Server, which means it retrieves data without modifying state.
Register the Tcmb MCP server in PolicyLayer and add a rule for tcmb_compare_currencies: 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 Tcmb. Nothing to install.
tcmb_compare_currencies 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 tcmb_compare_currencies 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 tcmb_compare_currencies. 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.
tcmb_compare_currencies is provided by the Tcmb MCP server (ofurkanuygur/tcmb_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 6 Tcmb tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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