AI agents call get_available_field_types 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 retrieves metadata about available field types in the Kintone system. It is a read-only operation that queries configuration information without modifying, creating, deleting, or executing any operations. The blast radius is minimal—an AI agent cannot cause harm by requesting this information.
From the tool's definition Tool name 'get_available_field_types' and description '利用可能なフィールドタイプの一覧を取得します' (retrieves a list of available field types) indicate a query/retrieval operation with no side effects.
Documented attack patterns abuse exactly the kind of access get_available_field_types 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_available_field_types:
{
"version": "1",
"default": "deny",
"tools": {
"get_available_field_types": {}
}
}get_available_field_types is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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利用可能なフィールドタイプの一覧を取得します. 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_available_field_types: 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_available_field_types 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_available_field_types 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_available_field_types. 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_available_field_types 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.