AI agents call list_users to retrieve information from Sprout without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns information about active users associated with a customer account. It performs a read-only operation with no side effects, data modification, execution of external commands, or financial transactions. The potential blast radius is minimal—an AI agent misusing this tool could retrieve user information but cannot create, modify, delete, or execute any actions.
From the tool's definition Tool name 'list_users' and description 'List all active users for a customer' indicate a retrieval operation with no modification or deletion of data.
Attacks that exploit this kind of access
List all active users for a customer. It is categorised as a Read tool in the Sprout MCP Server, which means it retrieves data without modifying state.
Register the Sprout MCP server in PolicyLayer and add a rule for list_users: 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 Sprout. Nothing to install.
list_users 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_users 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_users. 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_users is provided by the Sprout MCP server (jmeserve/sprout-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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