AI agents call get_sheet_data to retrieve information from Personal Knowledge MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves spreadsheet data from Feishu (a collaboration platform) without modifying, deleting, or executing any operations. It is a straightforward read operation with no side effects. The blast radius if misused is low — it can only expose existing data, not alter or destroy it.
From the tool's definition Tool name 'get_sheet_data' and description '获取飞书电子表格数据。支持读取指定工作表和范围的数据' (Get Feishu spreadsheet data. Supports reading data from specified worksheets and ranges) — the verb is 'get/read' with no modification or deletion capability.
Documented attack patterns abuse exactly the kind of access get_sheet_data gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Personal Knowledge MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_sheet_data:
{
"version": "1",
"default": "deny",
"tools": {
"get_sheet_data": {}
}
}get_sheet_data is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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获取飞书电子表格数据。支持读取指定工作表和范围的数据。. It is categorised as a Read tool in the Personal Knowledge MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Personal Knowledge MCP Server MCP server in PolicyLayer and add a rule for get_sheet_data: 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 Personal Knowledge MCP Server. Nothing to install.
get_sheet_data 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 get_sheet_data 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 get_sheet_data. 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.
get_sheet_data is provided by the Personal Knowledge MCP Server MCP server (kyodule/personal-knowledge-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Personal Knowledge MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
29 Personal Knowledge MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.