List all your bookmark collections (like playlists for tweets).
AI agents call list_collections to retrieve information from Krill To MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves existing bookmark collection metadata without creating, modifying, or deleting any data. It has no side effects and presents minimal risk if misused by an AI agent—the worst outcome would be exposing the structure of a user's collections, which is already known to the user. Classification as Read is appropriate.
From the tool's definition Tool description states 'List all your bookmark collections' - a retrieval operation with no modification or side effects. The verb 'list' is a canonical Read operation.
Attacks that exploit this kind of access
List all your bookmark collections (like playlists for tweets). It is categorised as a Read tool in the Krill To MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Krill To MCP Server MCP server in PolicyLayer and add a rule for list_collections: 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 Krill To MCP Server. Nothing to install.
list_collections 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_collections 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_collections. 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_collections is provided by the Krill To MCP Server MCP server (krillto/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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