kintoneアプリからファイルをダウンロードします。注意: 現在の実装では1MB以上のファイルは正常にダウンロードできない場合があります。
AI agents call download_file 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.
Downloading files is a retrieval operation with no side effects on the source data. While the tool may fail on large files (1MB+), this is a technical limitation rather than a destructive capability. The operation queries and retrieves data without creating, modifying, or deleting records in the Kintone application. This is a standard Read category tool.
From the tool's definition Tool name 'download_file' and description 'downloads files from Kintone app' (translated from Japanese: 'kintoneアプリからファイルをダウンロードします') indicates retrieval without modification or deletion.
Documented attack patterns abuse exactly the kind of access download_file 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 download_file:
{
"version": "1",
"default": "deny",
"tools": {
"download_file": {}
}
}download_file is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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kintoneアプリからファイルをダウンロードします。注意: 現在の実装では1MB以上のファイルは正常にダウンロードできない場合があります。. 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 download_file: 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.
download_file 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 download_file 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 download_file. 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.
download_file 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.
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70 Kintone MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.