Get mechanism tag category definitions.
AI agents call list_mechanism_categories to retrieve information from Umbrella Terminal MCP 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 static metadata (category definitions) without modifying data, executing code, or triggering external operations. It is a straightforward read operation on legislative intelligence data. The low severity reflects minimal blast radius—returning category definitions poses no risk of unintended data modification, deletion, or external effects.
From the tool's definition Tool name 'list_mechanism_categories' with description 'Get mechanism tag category definitions' indicates a retrieval operation that returns predefined category definitions with no side effects.
Attacks that exploit this kind of access
Get mechanism tag category definitions. It is categorised as a Read tool in the Umbrella Terminal MCP MCP Server, which means it retrieves data without modifying state.
Register the Umbrella Terminal MCP server in PolicyLayer and add a rule for list_mechanism_categories: 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 Umbrella Terminal MCP. Nothing to install.
list_mechanism_categories 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_mechanism_categories 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_mechanism_categories. 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_mechanism_categories is provided by the Umbrella Terminal MCP server (theblackcompany/umbrella_terminal_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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