kintoneアプリのフォームレイアウトを変更します。トップレベルには ROW と SUBTABLE と GROUP を配置できます。SUBTABLEやGROUPはトップレベルに配置する必要があります。ROW内に配置することはできません。SUBTABLEをレイアウトに含める際には、fieldsプロパティでテーブル内に表示するフィールドとその順序を指定する必要があります。また、ルックアップフィールドをフォームに配置する際は 250 以上の幅を明示的に指定してください。
AI agents use update_form_layout to create or update resources in Kintone MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Kintone MCP Server environment.
This tool modifies the configuration of a Kintone application's form layout—a structural change to how data is presented and organized. While the changes are reversible (can be undone by adjusting the layout again), unauthorized modifications to form layouts could disrupt user workflows, hide critical fields, or expose sensitive information. The blast radius includes impact on all users of that Kintone app.
From the tool's definition The tool description states it 'changes the form layout of a Kintone app' (kintoneアプリのフォームレイアウトを変更します). This is a reversible modification operation that alters the structure and presentation of application forms by repositioning elements (ROW, SUBTABLE,…
Documented attack patterns abuse exactly the kind of access update_form_layout 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 update_form_layout:
{
"version": "1",
"default": "deny",
"tools": {
"update_form_layout": {
"limits": [
{
"counter": "update_form_layout_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}update_form_layout stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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kintoneアプリのフォームレイアウトを変更します。トップレベルには ROW と SUBTABLE と GROUP を配置できます。SUBTABLEやGROUPはトップレベルに配置する必要があります。ROW内に配置することはできません。SUBTABLEをレイアウトに含める際には、fieldsプロパティでテーブル内に表示するフィールドとその順序を指定する必要があります。また、ルックアップフィールドをフォームに配置する際は 250 以上の幅を明示的に指定してください。. It is categorised as a Write tool in the Kintone MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Kintone MCP Server MCP server in PolicyLayer and add a rule for update_form_layout: 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.
update_form_layout is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the update_form_layout 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 update_form_layout. 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.
update_form_layout 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.