dedupe_lines
Drop duplicate lines, keeping the first (or last) occurrence.
This record as markdown: /tools/mcp-hands/dedupe-lines.md
What dedupe_lines does on Mcp Hands
AI agents call dedupe_lines to permanently remove resources in Mcp Hands, typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Why dedupe_lines is rated Critical
An AI agent that decides to call dedupe_lines doesn't hesitate, doesn't double-check, and doesn't stop at one. Whatever it removes from Mcp Hands is gone. There is no undo for destructive operations.
Attacks that exploit this kind of access
The rule that runs dedupe_lines safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Mcp Hands, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For dedupe_lines, this is the rule to start with:
dedupe_lines is removed from the agent's tool list entirely, so the agent never calls it. The rest of the server keeps working.
The button opens the PolicyLayer dashboard: create your workspace, connect Mcp Hands, apply this rule, and every dedupe_lines call is checked against it from then on.
Questions about dedupe_lines
Drop duplicate lines, keeping the first (or last) occurrence. It is categorised as a Destructive tool in the Mcp Hands MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Mcp Hands MCP server in PolicyLayer and add a rule for dedupe_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 Hands. Nothing to install.
dedupe_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 dedupe_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 dedupe_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.
dedupe_lines is provided by the Mcp Hands MCP server (huocai250/mcp-hands). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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