AI agents use tool_replace_line to create or update resources in UltimateCoder — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your UltimateCoder environment.
Replacing lines in files is a write operation that modifies data reversibly. While it could theoretically be part of a destructive workflow, the tool itself performs a standard edit operation (replacement, not deletion).
From the tool's definition Tool name 'tool_replace_line' combined with server description stating 'Automate file handling' and sibling tools like 'tool_apply_patch' and 'tool_delete_path' indicate file modification capability.
Documented attack patterns abuse exactly the kind of access tool_replace_line gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and UltimateCoder, and nothing reaches the server without passing your rules. This is the rule we recommend for tool_replace_line:
{
"version": "1",
"default": "deny",
"tools": {
"tool_replace_line": {
"limits": [
{
"counter": "tool_replace_line_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}tool_replace_line stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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tool_replace_line. It is categorised as a Write tool in the UltimateCoder MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the UltimateCoder MCP server in PolicyLayer and add a rule for tool_replace_line: 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 UltimateCoder. Nothing to install.
tool_replace_line 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 tool_replace_line 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 tool_replace_line. 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.
tool_replace_line is provided by the UltimateCoder MCP server (m-ahmed-elbeskeri/ultimatecodermcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from UltimateCoder, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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23 UltimateCoder tools catalogued and risk-classified — across an index of 43,000+ MCP servers.