Get the list of bands that the user joined from BAND.
AI agents call get_bands to retrieve information from Band MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool fetches a list of bands/groups the user is a member of. It is a read-only query operation that retrieves information without creating, modifying, deleting, or executing any actions. The low severity reflects minimal blast radius—the worst outcome is exposure of group membership data, which is typically non-sensitive metadata.
From the tool's definition Tool name 'get_bands' and description 'Get the list of bands that the user joined' indicate retrieval of existing data with no modification or side effects.
Attacks that exploit this kind of access
Get the list of bands that the user joined from BAND. It is categorised as a Read tool in the Band MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Band MCP Server MCP server in PolicyLayer and add a rule for get_bands: 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 Band MCP Server. Nothing to install.
get_bands 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_bands 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_bands. 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_bands is provided by the Band MCP Server MCP server (kanghouchao/band-mcp-server). 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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