デバイス別（PC/モバイル/タブレット）のアクセス内訳を取得します。OS別、ブラウザ別の情報も含まれます。
AI agents call get_device_breakdown to retrieve information from GA4 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 and analyzes Google Analytics 4 data about device types, operating systems, and browsers used by visitors. It performs a read-only query on analytics metrics with no capability to modify, delete, or execute external operations. The 'get_' prefix and retrieval-focused description confirm it is a pure Read operation with minimal risk.
From the tool's definition Tool name 'get_device_breakdown' and description 'デバイス別（PC/モバイル/タブレット）のアクセス内訳を取得します' (retrieves device breakdown by PC/mobile/tablet with OS and browser information) indicates data retrieval with no modification or side effects.
Attacks that exploit this kind of access
デバイス別（PC/モバイル/タブレット）のアクセス内訳を取得します。OS別、ブラウザ別の情報も含まれます。. It is categorised as a Read tool in the GA4 MCP Server MCP Server, which means it retrieves data without modifying state.
Register the GA4 MCP Server MCP server in PolicyLayer and add a rule for get_device_breakdown: 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 GA4 MCP Server. Nothing to install.
get_device_breakdown 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_device_breakdown 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_device_breakdown. 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_device_breakdown is provided by the GA4 MCP Server MCP server (shin-sibainu/ga4-mcp-server). 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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