Resolve an album/release from MusicBrainz (CC0). Pass a barcode (UPC/EAN), artist + album, or a free-text query. Returns ranked releases with MBID, title, artist, date, country, barcode, status, track count, label, catalog number. Barcode → album is the differentiated lookup. Keyless, public-domain.
AI agents call music.release to retrieve information from Mcp without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a pure data retrieval tool that queries MusicBrainz and returns structured information about music releases. The operations described (resolve, pass query, return data) are all read-only with no side effects. No data is modified, deleted, executed, or used to move funds. The blast radius of misuse is minimal—an agent cannot harm systems or data by repeatedly querying public music metadata.
From the tool's definition Tool 'resolves' and 'returns' album/release data from MusicBrainz. No creation, modification, deletion, code execution, or financial transaction is performed.
Attacks that exploit this kind of access
Resolve an album/release from MusicBrainz (CC0). Pass a barcode (UPC/EAN), artist + album, or a free-text query. Returns ranked releases with MBID, title, artist, date, country, barcode, status, track count, label, catalog number. Barcode → album is the differentiated lookup. Keyless, public-domain. It is categorised as a Read tool in the Mcp MCP Server, which means it retrieves data without modifying state.
Register the MCP server in PolicyLayer and add a rule for music.release: 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 Mcp. Nothing to install.
music.release 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 music.release 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 music.release. 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.
music.release is provided by the MCP server (@2sio/mcp). 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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