Create a new artist or update an existing one. The artist ID is derived from the name (lowercased and trimmed), so upserting with the same name is idempotent.
AI agents use upsert_artist to create or update resources in Bandmate MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Bandmate MCP Server environment.
This tool creates or modifies artist records in the Bandmate database. Create and update operations are reversible and represent data modification without permanent deletion. The Write category is appropriate. Severity is medium because misuse could create spam artist records or pollute the music database, but the impact is limited to a single artist entity and is reversible.
From the tool's definition Tool description states "Create a new artist or update an existing one" — explicit create/update operations on data. The idempotent nature (updates are reversible) confirms Write rather than Destructive.
Attacks that exploit this kind of access
Create a new artist or update an existing one. The artist ID is derived from the name (lowercased and trimmed), so upserting with the same name is idempotent. It is categorised as a Write tool in the Bandmate MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Bandmate MCP Server MCP server in PolicyLayer and add a rule for upsert_artist: 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 Bandmate MCP Server. Nothing to install.
upsert_artist is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the upsert_artist 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 upsert_artist. 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.
upsert_artist is provided by the Bandmate MCP Server MCP server (jnicolasgomez/bandmate-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.
Teams ship this data inside their own products. See what a licence covers →