AI agents call get_weekly_chart_list to retrieve information from Lastfm without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves/lists available date ranges for weekly charts—a read-only operation with no side effects. It queries existing data to help users understand what chart data is available. The blast radius of misuse is minimal since it only returns informational metadata about chart availability.
From the tool's definition Tool name 'get_weekly_chart_list' and description 'Get available weekly chart date ranges for user' indicate a query operation that retrieves metadata about available charts without modifying data.
Documented attack patterns abuse exactly the kind of access get_weekly_chart_list gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Lastfm, and nothing reaches the server without passing your rules. This is the rule we recommend for get_weekly_chart_list:
{
"version": "1",
"default": "deny",
"tools": {
"get_weekly_chart_list": {}
}
}get_weekly_chart_list is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get available weekly chart date ranges for user\. It is categorised as a Read tool in the Lastfm MCP Server, which means it retrieves data without modifying state.
Register the Lastfm MCP server in PolicyLayer and add a rule for get_weekly_chart_list: 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 Lastfm. Nothing to install.
get_weekly_chart_list 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_weekly_chart_list 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_weekly_chart_list. 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_weekly_chart_list is provided by the Lastfm MCP server (rianvdm/lastfm-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 21 Lastfm tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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21 Lastfm tools catalogued and risk-classified — across an index of 42,500+ MCP servers.