Download a file from the output directory (returns base64-encoded content). Use this to retrieve analysis results.
AI agents call download_file to retrieve information from REMnux 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 reads files from a designated output directory without creating, modifying, executing code, or deleting anything. It is a pure read operation. The base64 encoding is a transport mechanism, not a side effect. Severity is low because reading analysis output from a controlled directory poses minimal risk even if misused—an agent could only access files already in the output directory.
From the tool's definition The tool description explicitly states it 'Download[s] a file from the output directory (returns base64-encoded content)' and is intended to 'retrieve analysis results.' The action is retrieval-only with no modification or deletion of data.
Documented attack patterns abuse exactly the kind of access download_file gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and REMnux MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for download_file:
{
"version": "1",
"default": "deny",
"tools": {
"download_file": {}
}
}download_file is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Download a file from the output directory (returns base64-encoded content). Use this to retrieve analysis results. It is categorised as a Read tool in the REMnux MCP Server MCP Server, which means it retrieves data without modifying state.
Register the REMnux MCP Server MCP server in PolicyLayer and add a rule for download_file: 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 REMnux MCP Server. Nothing to install.
download_file 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 download_file 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 download_file. 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.
download_file is provided by the REMnux MCP Server MCP server (remnux/remnux-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 14 REMnux MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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14 REMnux MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.