upload_cards · MCP Server Learning MCP: Risk & Policy

WHAT IT DOES

What upload_cards does on MCP Server Learning

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

WHY IT NEEDS A POLICY

Why upload_cards needs a policy

The tool name 'upload_cards' most naturally maps to Write category—it creates or modifies flashcard data in an educational context (Anki). The empty description reduces confidence slightly, but the naming convention and sibling tools (create_cards, create_item, create_item_note) strongly suggest reversible data creation/modification rather than deletion or destructive operations.

From the tool's definition Tool name 'upload_cards' and server context (Anki integration for flashcard generation) indicate creation or modification of flashcard data. Sibling tool 'create_cards' confirms this server handles flashcard generation/modification.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

upload_cards Rate-limited

upload_cards 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": {
    "upload_cards": {
      "limits": [
        {
          "counter": "upload_cards_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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

FAQ

Questions about upload_cards

What does the upload_cards tool do? +

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

How do I enforce a policy on upload_cards? +

Register the MCP Server Learning MCP server in PolicyLayer and add a rule for upload_cards: 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 MCP Server Learning. Nothing to install.

What risk level is upload_cards? +

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

Can I rate-limit upload_cards? +

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

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

upload_cards is provided by the MCP Server Learning MCP server (xstraven/mcp-server-learning). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.