AI agents call get_preview_form_fields to retrieve information from Kintone MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns form field metadata from a preview environment. It performs a read-only operation with no side effects—no data is created, modified, deleted, or executed. The preview environment context further limits any potential impact. Blast radius is minimal as it only exposes schema/structure information.
From the tool's definition Tool name 'get_preview_form_fields' and description state it 'retrieves' (取得します) form field information from a preview environment Kintone app. The verb 'get' and context indicate data retrieval without modification.
Documented attack patterns abuse exactly the kind of access get_preview_form_fields gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Kintone MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_preview_form_fields:
{
"version": "1",
"default": "deny",
"tools": {
"get_preview_form_fields": {}
}
}get_preview_form_fields is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
プレビュー環境のkintoneアプリのフォームフィールド情報を取得します. It is categorised as a Read tool in the Kintone MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Kintone MCP Server MCP server in PolicyLayer and add a rule for get_preview_form_fields: 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 Kintone MCP Server. Nothing to install.
get_preview_form_fields 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_preview_form_fields 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_preview_form_fields. 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_preview_form_fields is provided by the Kintone MCP Server MCP server (r3-yamauchi/kintone-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Kintone 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.
70 Kintone MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.