AI agents call op_list_vaults to retrieve information from Op without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only operation that queries and returns vault metadata. It has no side effects, does not modify data, and does not trigger external operations. The severity is low because listing accessible vaults reveals organizational structure but does not expose secret values themselves or enable destructive actions.
From the tool's definition Tool name contains 'list' and description states 'List all 1Password vaults the authenticated account can access' — this is a query operation that retrieves vault information without modification.
Attacks that exploit this kind of access
List all 1Password vaults the authenticated account can access. It is categorised as a Read tool in the Op MCP Server, which means it retrieves data without modifying state.
Register the Op MCP server in PolicyLayer and add a rule for op_list_vaults: 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 Op. Nothing to install.
op_list_vaults 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 op_list_vaults 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 op_list_vaults. 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.
op_list_vaults is provided by the Op MCP server (jluckyiv/op-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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