upload_media

THE RISK

Medium Risk

Why upload_media needs a policy

The tool creates or stores data (a media file) and returns an identifier for subsequent use. This is a reversible write operation without permanent deletion or code execution. The severity is low because uploading media in a tax/invoicing context has limited blast radius — the files can be managed, replaced, or removed without financial impact or system compromise.

From the tool's definition Tool description states 'Upload a media file and get back a media_id' — this creates new media resources in the system via Multipart POST.

Documented attack patterns abuse exactly the kind of access upload_media gives an agent:

POLICY

How to control upload_media

PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Afip, and nothing reaches the server without passing your rules. This is the rule we recommend for upload_media:

policy.json

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

upload_media 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.

Create a free account and register Mcp Afip — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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All 1300 Mcp Afip tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about upload_media

What does the upload_media tool do? +

Upload a media file and get back a media_id reusable in send_media_message. Multipart POST to /{phone_number_id}/media. It is categorised as a Write tool in the Mcp Afip 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_media? +

Register the Mcp Afip MCP server in PolicyLayer and add a rule for upload_media: 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 Afip. Nothing to install.

What risk level is upload_media? +

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

Can I rate-limit upload_media? +

Yes. Add a rate_limit block to the upload_media 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_media completely? +

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

upload_media is provided by the Mcp Afip MCP server (codespar/mcp-dev-latam). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Mcp Afip tool call.

Start from Mcp Afip, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →