List all category definitions configured in the vault.
AI agents call vault_list_category_definitions to retrieve information from Vault MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a simple query/list operation to retrieve configuration metadata from the Vault server. It has no side effects, does not execute code or commands, does not modify data, and does not delete anything. The blast radius of misuse is minimal—an AI agent could only retrieve information about available categories, which is low-risk configuration browsing. Categorized as Read per the classification rules.
From the tool's definition Tool name 'vault_list_category_definitions' and description 'List all category definitions configured in the vault' indicate a retrieval operation that queries metadata about category definitions without modifying, executing, or deleting any data.
Attacks that exploit this kind of access
List all category definitions configured in the vault. It is categorised as a Read tool in the Vault MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Vault MCP Server MCP server in PolicyLayer and add a rule for vault_list_category_definitions: 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 Vault MCP Server. Nothing to install.
vault_list_category_definitions 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 vault_list_category_definitions 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 vault_list_category_definitions. 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.
vault_list_category_definitions is provided by the Vault MCP Server MCP server (muhammadtaimur/vault-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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