Replace a range of lines in a script. The change is staged as a diff for review (unless auto-accept is on). Args: - path (string): Script path - startLine (number): First line to replace (1-based) - endLine (number): Last line to replace (1-based) - newContent (string): Replacement content for th...
AI agents use edit_script_lines to create or update resources in Melo — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Melo environment.
This tool modifies script files by replacing specified line ranges with new content. It is a Write operation rather than Execute because the tool itself performs the modification rather than executing arbitrary code; the actual code execution would occur when the modified script runs in Roblox.
From the tool's definition Tool description states 'Replace a range of lines in a script' and accepts parameters for startLine, endLine, and newContent. The staged diff mechanism and auto-accept flag indicate reversible modifications to script content.
Attacks that exploit this kind of access
Replace a range of lines in a script. The change is staged as a diff for review (unless auto-accept is on). Args: - path (string): Script path - startLine (number): First line to replace (1-based) - endLine (number): Last line to replace (1-based) - newContent (string): Replacement content for the line range - anchor (string, optional): Content snippet expected at startLine. If provided, the edit finds the anchor within ±5 lines of startLine and applies there. Use this when the file may have shifted under you. Mismatch returns a clear error instead of editing. Returns: Diff summary of the change. It is categorised as a Write tool in the Melo MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Melo MCP server in PolicyLayer and add a rule for edit_script_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 Melo. Nothing to install.
edit_script_lines is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the edit_script_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 edit_script_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.
edit_script_lines is provided by the Melo MCP server (yannyhl/linkedsword-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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