Get App Store chart rankings (top free, top paid, or top grossing) for a specific country, platform, and category
AI agents call get_chart to retrieve information from AppRanks 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 public App Store chart data (top free, top paid, top grossing rankings) for specified parameters. It has no side effects, does not modify data, execute commands, or trigger external operations. The data being accessed is publicly available app store information. The blast radius of misuse is minimal—an agent could only retrieve ranking information that is already public, posing no security risk.
From the tool's definition Tool description indicates 'Get App Store chart rankings' which retrieves and queries public app store ranking data with no modification or execution capabilities.
Attacks that exploit this kind of access
Get App Store chart rankings (top free, top paid, or top grossing) for a specific country, platform, and category. It is categorised as a Read tool in the AppRanks MCP Server MCP Server, which means it retrieves data without modifying state.
Register the AppRanks MCP Server MCP server in PolicyLayer and add a rule for get_chart: 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 AppRanks MCP Server. Nothing to install.
get_chart 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_chart 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_chart. 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_chart is provided by the AppRanks MCP Server MCP server (kanzelsberger/appranks). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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