List vaults visible to the authenticated 1Password integration.
AI agents call vault_list to retrieve information from Mcp 1password without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only retrieves and queries vault information accessible to the authenticated user. It has no side effects, does not create, modify, or delete data, and does not execute code or move money. It is a straightforward information-retrieval operation fitting the 'Read' category. Severity is low because listing vaults is a standard discovery operation with minimal blast radius if misused by an AI agent.
From the tool's definition The tool is 'vault_list' and the description states it will 'List vaults visible to the authenticated 1Password integration.' This is a read-only operation that retrieves metadata about vaults without modifying or deleting any data.
Attacks that exploit this kind of access
List vaults visible to the authenticated 1Password integration. It is categorised as a Read tool in the Mcp 1password MCP Server, which means it retrieves data without modifying state.
Register the Mcp 1password MCP server in PolicyLayer and add a rule for vault_list: 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 Mcp 1password. Nothing to install.
vault_list 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 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. 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 is provided by the Mcp 1password MCP server (kefapps/onepassword-mcp-codex). 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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