Download a file from kintone using file key
AI agents call downloadFile to retrieve information from kintone OAuth MCP Server on Cloudflare Workers without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
downloadFile retrieves file data from kintone without modifying, creating, or deleting anything. It matches the Read category definition: 'retrieves or queries data; no side effects'. The blast radius of misuse is low—an attacker could access files they shouldn't see, but cannot alter kintone data or trigger external operations.
From the tool's definition Tool description states 'Download a file from kintone using file key' - this is a retrieval operation with no side effects. The server context confirms file operations are supported, and downloading is a non-destructive read action.
Attacks that exploit this kind of access
Download a file from kintone using file key. It is categorised as a Read tool in the kintone OAuth MCP Server on Cloudflare Workers MCP Server, which means it retrieves data without modifying state.
Register the kintone OAuth MCP Server on Cloudflare Workers MCP server in PolicyLayer and add a rule for downloadFile: 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 OAuth MCP Server on Cloudflare Workers. Nothing to install.
downloadFile 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 downloadFile 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 downloadFile. 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.
downloadFile is provided by the kintone OAuth MCP Server on Cloudflare Workers MCP server (r3-yamauchi/kintone-oauth-mcp-server-cfw). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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