Jump to a specific line in a large file with surrounding context lines. Highlights the target line.
AI agents call navigate_to_line to retrieve information from Large File MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and displays a specific line and its context from a file. It is a pure read operation with no side effects — it neither modifies nor deletes any data. Misuse potential is minimal, limited to reading file contents.
From the tool's definition "Jump to a specific line in a large file with surrounding context lines. Highlights the target line."
Documented attack patterns abuse exactly the kind of access navigate_to_line gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Large File MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for navigate_to_line:
{
"version": "1",
"default": "deny",
"tools": {
"navigate_to_line": {}
}
}navigate_to_line is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Jump to a specific line in a large file with surrounding context lines. Highlights the target line. It is categorised as a Read tool in the Large File MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Large File MCP Server MCP server in PolicyLayer and add a rule for navigate_to_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 Large File MCP Server. Nothing to install.
navigate_to_line is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the navigate_to_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 navigate_to_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.
navigate_to_line is provided by the Large File MCP Server MCP server (willianpinho/large-file-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Large File MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
6 Large File MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.