List all user-defined property definitions in the vault.
AI agents call vault_list_property_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.
The tool retrieves metadata about property definitions from the Vault server without creating, modifying, deleting, or executing any operations. It is a pure read operation consistent with other sibling tools like vault_get_property_definition and vault_get_folder_contents. Misuse poses minimal risk as it only exposes the schema/structure of custom properties, not sensitive data itself.
From the tool's definition Tool name is 'vault_list_property_definitions' and description states it 'List[s] all user-defined property definitions in the vault.' This is a list/query operation with no modification or side effects.
Risk signalsBulk/mass operation — affects multiple targets
Attacks that exploit this kind of access
List all user-defined property definitions 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_property_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_property_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_property_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_property_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_property_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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