Find artists similar to any artist using Last.fm data - No authentication required
AI agents call get_similar_artists 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 and queries artist similarity information from Last.fm's public database. It has no side effects, does not modify data, execute code, delete anything, or involve financial transactions. It is a straightforward read operation returning similar artist recommendations based on Last.fm's existing data.
From the tool's definition Tool name 'get_similar_artists' and description state it 'Find artists similar to any artist using Last.fm data' - a pure query/retrieval operation with 'No authentication required', indicating read-only public data access.
Documented attack patterns abuse exactly the kind of access get_similar_artists 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_similar_artists:
{
"version": "1",
"default": "deny",
"tools": {
"get_similar_artists": {}
}
}get_similar_artists is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Find artists similar to any artist using Last.fm data - No authentication required. 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_similar_artists: 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_similar_artists 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_similar_artists 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_similar_artists. 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_similar_artists 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.
Free to start. No card required.
21 Lastfm tools catalogued and risk-classified — across an index of 42,500+ MCP servers.