create_upload_session · Rag MCP: Risk & Policy

WHAT IT DOES

What create_upload_session does on Rag

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

WHY IT NEEDS A POLICY

Why create_upload_session needs a policy

This tool creates a temporary upload session, which is a reversible write operation that establishes state without permanently storing data or triggering external side effects. The session is ephemeral and can be cleaned up. Severity is low because misuse (creating many sessions) would be a resource exhaustion concern rather than data compromise or operational damage.

From the tool's definition Tool name 'create_upload_session' and description 'Create a secure temporary file upload session' indicate creation of a transient server resource (a session).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_upload_session Rate-limited

create_upload_session 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": {
    "create_upload_session": {
      "limits": [
        {
          "counter": "create_upload_session_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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Instant setup, no code required.

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

FAQ

Questions about create_upload_session

What does the create_upload_session tool do? +

Create a secure temporary file upload session. It is categorised as a Write tool in the Rag MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_upload_session? +

Register the Rag MCP server in PolicyLayer and add a rule for create_upload_session: 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 Rag. Nothing to install.

What risk level is create_upload_session? +

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

Can I rate-limit create_upload_session? +

Yes. Add a rate_limit block to the create_upload_session 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 create_upload_session completely? +

Set action: deny in the PolicyLayer policy for create_upload_session. 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 create_upload_session? +

create_upload_session is provided by the Rag MCP server (mrankitvish/rag-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.