AI agents call get_top_tracks 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 user's top tracks data from Last.fm without modifying, deleting, or executing external operations. It is a straightforward data query with no side effects. The incomplete description reduces confidence slightly, but context from sibling tools and naming convention strongly indicate a read operation.
From the tool's definition Tool name is 'get_top_tracks' and prefix 'get_' indicates a read operation. Description states 'Get user' (incomplete but suggests retrieval).
Documented attack patterns abuse exactly the kind of access get_top_tracks 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_top_tracks:
{
"version": "1",
"default": "deny",
"tools": {
"get_top_tracks": {}
}
}get_top_tracks is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get 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_top_tracks: 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_top_tracks 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_top_tracks 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_top_tracks. 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_top_tracks 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.