Remove a credential from the vault
AI agents call vault_delete to permanently remove resources in Mailgent MCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
This tool permanently deletes credentials from a secure vault, which is an irreversible action. Credentials cannot be recovered once removed. Even though the blast radius is limited to the vault scope rather than arbitrary data, the permanent destruction of authentication material that agents depend on qualifies as Destructive.
From the tool's definition Tool name is 'vault_delete' with description 'Remove a credential from the vault'. The verb 'Remove' combined with 'delete' in the function name indicates irreversible deletion of stored credentials.
Attacks that exploit this kind of access
Remove a credential from the vault. It is categorised as a Destructive tool in the Mailgent MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Mailgent MCP Server MCP server in PolicyLayer and add a rule for vault_delete: 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 Mailgent MCP Server. Nothing to install.
vault_delete is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the vault_delete 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_delete. 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_delete is provided by the Mailgent MCP Server MCP server (loomal-ai/loomal-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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