Stream a large file in chunks. Returns multiple chunks for processing very large files efficiently.
AI agents call stream_large_file 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 returns file content in a streaming format for processing. There is no indication of data modification, deletion, execution, or financial impact. The capability is purely informational—reading file contents in an efficient manner without side effects. Streaming is a retrieval mechanism, not a write or execute operation.
From the tool's definition Tool is described as 'Stream a large file in chunks' and 'Returns multiple chunks for processing very large files efficiently.' The verb 'stream' and 'returns' indicate data retrieval without modification.
Documented attack patterns abuse exactly the kind of access stream_large_file 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 stream_large_file:
{
"version": "1",
"default": "deny",
"tools": {
"stream_large_file": {}
}
}stream_large_file is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Stream a large file in chunks. Returns multiple chunks for processing very large files efficiently. 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 stream_large_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 Large File MCP Server. Nothing to install.
stream_large_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 stream_large_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 stream_large_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.
stream_large_file 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.