Delete specific lines from a file
AI agents call delete_lines to permanently remove resources in MCP Start App — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
This tool permanently removes content from files without the ability to recover the deleted lines through the tool itself. While edits can theoretically be undone via version control or backups, the tool's core function is destructive—it cannot be reversed by a user action through the MCP interface.
From the tool's definition Tool name 'delete_lines' combined with description 'Delete specific lines from a file' indicates irreversible removal of data from a file.
Attacks that exploit this kind of access
Delete specific lines from a file. It is categorised as a Destructive tool in the MCP Start App MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the MCP Start App MCP server in PolicyLayer and add a rule for delete_lines: 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 Start App. Nothing to install.
delete_lines 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 delete_lines 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 delete_lines. 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.
delete_lines is provided by the MCP Start App MCP server (nexus-aissam/mcp-local). 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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