List all available tags.
AI agents call list_tags to retrieve information from Zimbra 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 and queries existing tags without modifying, creating, or deleting any data. It is a simple enumeration operation that returns information to the user. No reversible or irreversible changes occur. The blast radius of misuse is minimal—an AI agent could at worst retrieve tag metadata, which does not compromise system integrity or cause harm.
From the tool's definition Tool name 'list_tags' and description 'List all available tags' indicate a retrieval operation with no side effects.
Attacks that exploit this kind of access
List all available tags. It is categorised as a Read tool in the Zimbra MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Zimbra MCP Server MCP server in PolicyLayer and add a rule for list_tags: 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 Zimbra MCP Server. Nothing to install.
list_tags 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_tags 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_tags. 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_tags is provided by the Zimbra MCP Server MCP server (jeremie-lesage/zimbra-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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