List all your shortened URLs. Each entry includes estimatedTokensSaved — the per-substitution token saving if that slug is used in place of the full URL in future context.
AI agents call list_urls to retrieve information from Url Shortener without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and displays information about shortened URLs without creating, modifying, deleting, or executing any operations. It is a straightforward read operation similar to 'list' or 'get' commands. The low severity reflects minimal risk—the worst case is information disclosure of the user's own URL shortening history, which is expected functionality for a management tool.
From the tool's definition Tool name 'list_urls' and description 'List all your shortened URLs' indicates retrieval/querying of data with no modification, deletion, or execution.
Attacks that exploit this kind of access
List all your shortened URLs. Each entry includes estimatedTokensSaved — the per-substitution token saving if that slug is used in place of the full URL in future context. It is categorised as a Read tool in the Url Shortener MCP Server, which means it retrieves data without modifying state.
Register the Url Shortener MCP server in PolicyLayer and add a rule for list_urls: 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 Url Shortener. Nothing to install.
list_urls 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_urls 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_urls. 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_urls is provided by the Url Shortener MCP server (michaelshumshum/url-shortener-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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