List all active users in the Fizzy account. Use user IDs from this list to assign cards.
AI agents call fizzy_list_users to retrieve information from Fizzy 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 user information from the Fizzy task management system without creating, modifying, or deleting any data. It is a straightforward read operation with no side effects. Low severity because exposing a list of active users poses minimal risk; user enumeration is typically a pre-existing concern in most systems and does not directly enable harmful actions without subsequent tool abuse.
From the tool's definition Tool description states 'List all active users' — a retrieval operation with no modification of state. The purpose is to query and display user data to inform subsequent operations.
Attacks that exploit this kind of access
List all active users in the Fizzy account. Use user IDs from this list to assign cards. It is categorised as a Read tool in the Fizzy MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Fizzy MCP Server MCP server in PolicyLayer and add a rule for fizzy_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 Fizzy MCP Server. Nothing to install.
fizzy_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 fizzy_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 fizzy_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.
fizzy_list_users is provided by the Fizzy MCP Server MCP server (ryanyogan/fizzy-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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