List shelves available to the authenticated user
AI agents call list_shelves to retrieve information from Shelv MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves metadata about available shelves. It performs a read-only query that returns information to the user without altering any state, creating resources, executing code, or triggering external operations. The operation is non-destructive and poses minimal security risk unless the list itself reveals sensitive organizational structure, hence low severity.
From the tool's definition Tool name is 'list_shelves' and description states 'List shelves available to the authenticated user' — a direct retrieval operation with no modification or side effects.
Attacks that exploit this kind of access
List shelves available to the authenticated user. It is categorised as a Read tool in the Shelv MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Shelv MCP Server MCP server in PolicyLayer and add a rule for list_shelves: 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 Shelv MCP Server. Nothing to install.
list_shelves 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 list_shelves 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 list_shelves. 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.
list_shelves is provided by the Shelv MCP Server MCP server (shelv-dev/shelv-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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