Check if a Finnish statute or provision is in force (current or historical). Returns the document's status (in_force, amended, repealed, not_yet_in_force), dates, and warnings. Provide as_of_date for historical evaluation. When NOT to use: If you need the actual text of a provision, use get_provi...
Part of the Finnish Law server.
Free to start. No card required.
AI agents call check_currency to retrieve information from Finnish Law 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_currency 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_currency": {}
}
}See the full Finnish Law policy for all 16 tools.
These attack patterns abuse exactly the kind of access check_currency 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 Finnish statute or provision is in force (current or historical). Returns the document's status (in_force, amended, repealed, not_yet_in_force), dates, and warnings. Provide as_of_date for historical evaluation. When NOT to use: If you need the actual text of a provision, use get_provision. This tool only checks status.. It is categorised as a Read tool in the Finnish Law MCP Server, which means it retrieves data without modifying state.
Register the Finnish Law MCP server in PolicyLayer and add a rule for check_currency: 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 Finnish Law. Nothing to install.
check_currency 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_currency 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_currency. 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_currency is provided by the Finnish Law MCP server (@ansvar/finnish-law-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 16 Finnish Law tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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