Delete a credential from the local credentials file. Note: Cannot delete credentials set via environment variables.
AI agents call browser_delete_credential to permanently remove resources in MCProxy — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
This tool permanently removes stored credentials, which cannot be undone. While it cannot affect environment variable credentials, deletion of file-based credentials is irreversible data destruction. The blast radius is high because an agent misusing this could delete legitimate credentials needed for service operations, causing service disruption or security complications.
From the tool's definition Tool name contains 'delete' and description explicitly states 'Delete a credential from the local credentials file', indicating irreversible removal of stored authentication material.
Attacks that exploit this kind of access
Delete a credential from the local credentials file. Note: Cannot delete credentials set via environment variables. It is categorised as a Destructive tool in the MCProxy MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the MCProxy MCP server in PolicyLayer and add a rule for browser_delete_credential: 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 MCProxy. Nothing to install.
browser_delete_credential 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 browser_delete_credential 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 browser_delete_credential. 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.
browser_delete_credential is provided by the MCProxy MCP server (saladtechnologies/mcproxy). 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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