Compute the Korean Four Pillars (년월일시) from a Gregorian birth date: stems, branches, Day Master, and Five Element counts. Optional local hour refines the hour pillar.
Part of the SAJU (Korean Fortune Teller) server.
Free to start. No card required.
AI agents call calculate_saju to retrieve information from SAJU (Korean Fortune Teller) 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_saju 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_saju": {}
}
}See the full SAJU (Korean Fortune Teller) policy for all 4 tools.
These attack patterns abuse exactly the kind of access calculate_saju 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.
Compute the Korean Four Pillars (년월일시) from a Gregorian birth date: stems, branches, Day Master, and Five Element counts. Optional local hour refines the hour pillar.. It is categorised as a Read tool in the SAJU (Korean Fortune Teller) MCP Server, which means it retrieves data without modifying state.
Register the SAJU (Korean Fortune Teller) MCP server in PolicyLayer and add a rule for calculate_saju: 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 SAJU (Korean Fortune Teller). Nothing to install.
calculate_saju 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_saju 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_saju. 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_saju is provided by the SAJU (Korean Fortune Teller) MCP server (saju-from-seoul/saju). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 4 SAJU (Korean Fortune Teller) tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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