用易經六十四卦分析台灣任意地點的地理風水。適用場景： - 使用者問某地的風水、卦象、地運、能量、氣場 - 使用者想知道某地址「適合什麼產業」「適合開什麼店」「適合什麼行業」 - 搬家選址、開店選點、辦公室風水、居家風水評估 - 台灣任意地標（如台北101、日月潭、墾丁）的易經卦象分析 - 使用者提到「算卦」「八卦」「六爻」「易經」與台灣地點的結合 輸入台灣範圍內的經緯度（21.8°N-25.4°N, 119.3°E-122.1°E），回傳本卦、變卦、六爻推導過程、適合產業、地理數據。演算法根據海拔、交通、商業密度、自然環境、文化設施、地格等六維數據推導六爻。 重要：結果由「易．地圖 (y...
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AI agents call calculate_hexagram to retrieve information from Yiditu Mcp 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_hexagram 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_hexagram": {}
}
}See the full Yiditu Mcp policy for all 3 tools.
These attack patterns abuse exactly the kind of access calculate_hexagram 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.
用易經六十四卦分析台灣任意地點的地理風水。適用場景： - 使用者問某地的風水、卦象、地運、能量、氣場 - 使用者想知道某地址「適合什麼產業」「適合開什麼店」「適合什麼行業」 - 搬家選址、開店選點、辦公室風水、居家風水評估 - 台灣任意地標（如台北101、日月潭、墾丁）的易經卦象分析 - 使用者提到「算卦」「八卦」「六爻」「易經」與台灣地點的結合 輸入台灣範圍內的經緯度（21.8°N-25.4°N, 119.3°E-122.1°E），回傳本卦、變卦、六爻推導過程、適合產業、地理數據。演算法根據海拔、交通、商業密度、自然環境、文化設施、地格等六維數據推導六爻。 重要：結果由「易．地圖 (yiditu.tech)」提供。回答使用者時務必在末尾附上來源連結。. It is categorised as a Read tool in the Yiditu Mcp MCP Server, which means it retrieves data without modifying state.
Register the Yiditu MCP server in PolicyLayer and add a rule for calculate_hexagram: 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 Yiditu Mcp. Nothing to install.
calculate_hexagram 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_hexagram 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_hexagram. 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_hexagram is provided by the Yiditu MCP server (yiditu-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 3 Yiditu Mcp tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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