needle_add_file · Needle MCP Server MCP: Risk & Policy

WHAT IT DOES

What needle_add_file does on Needle MCP Server

AI agents use needle_add_file to create or update resources in Needle MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Needle MCP Server environment.

WHY IT NEEDS A POLICY

Why needle_add_file needs a policy

Adding a file to a collection is a reversible write operation—it creates or uploads data but does not delete, execute code, or move money. Severity is medium because bulk file uploads or adding malicious documents could degrade system performance or introduce problematic content, but the operation itself is not destructive or irreversible.

From the tool's definition Tool name 'needle_add_file' indicates file addition/upload. Server context describes 'manage documents' suggesting create/modify capabilities.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

needle_add_file Rate-limited

needle_add_file 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "needle_add_file": {
      "limits": [
        {
          "counter": "needle_add_file_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Needle MCP Server, so you can run agents against it safely.

FAQ

Questions about needle_add_file

What does the needle_add_file tool do? +

needle_add_file. It is categorised as a Write tool in the Needle MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on needle_add_file? +

Register the Needle MCP Server MCP server in PolicyLayer and add a rule for needle_add_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 Needle MCP Server. Nothing to install.

What risk level is needle_add_file? +

needle_add_file is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit needle_add_file? +

Yes. Add a rate_limit block to the needle_add_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.

How do I block needle_add_file completely? +

Set action: deny in the PolicyLayer policy for needle_add_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.

What MCP server provides needle_add_file? +

needle_add_file is provided by the Needle MCP Server MCP server (needle-ai/needle-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.