upload_photo · SergeyKrin9/mcp Servers MCP: Risk & Policy

WHAT IT DOES

What upload_photo does on SergeyKrin9/mcp Servers

AI agents use upload_photo to create or update resources in SergeyKrin9/mcp Servers — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your SergeyKrin9/mcp Servers environment.

WHY IT NEEDS A POLICY

Why upload_photo needs a policy

This tool creates new media attachments that persist in the system and can be published to social platforms (VK Wall based on sibling tools and server scope). While reversible (can delete/replace), the action modifies platform state by adding new assets. Classified as Write rather than Execute because the tool's primary function is data creation/storage, not arbitrary code execution.

From the tool's definition Tool uploads photo from public URL and returns attachment string for use in post_to_wall. Description explicitly states upload action creating media assets that will be used in posts.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

upload_photo Rate-limited

upload_photo 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_photo": {
      "limits": [
        {
          "counter": "upload_photo_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 SergeyKrin9/mcp Servers, so you can run agents against it safely.

FAQ

Questions about upload_photo

What does the upload_photo tool do? +

Upload a photo from public URL. Returns attachment string for use in post_to_wall. It is categorised as a Write tool in the SergeyKrin9/mcp Servers 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_photo? +

Register the SergeyKrin9/mcp Servers MCP server in PolicyLayer and add a rule for upload_photo: 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 SergeyKrin9/mcp Servers. Nothing to install.

What risk level is upload_photo? +

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

Can I rate-limit upload_photo? +

Yes. Add a rate_limit block to the upload_photo 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_photo completely? +

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

upload_photo is provided by the SergeyKrin9/mcp Servers MCP server (sergeykrin9/mcp-servers). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.