set_album_cover

THE RISK

Medium Risk

Why set_album_cover needs a policy

This action creates or modifies data (album cover assignment) in a reversible manner. A user can simply set a different photo as the cover later. It does not delete data, execute code, transfer funds, or trigger external operations with unpredictable effects. The scope is limited to album metadata within Google Photos.

From the tool's definition Tool name is 'set_album_cover' and description states 'Set the cover photo of a Google Photos album.' This modifies metadata of an existing album by changing which photo is displayed as its cover.

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

POLICY

How to control set_album_cover

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

policy.json

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

set_album_cover 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 Google Photos MCP Server — 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

Related tools and policies

More Google Photos MCP Server tools

Execute start_auth Start Google OAuth authentication flow. Spins up a temporary local server, returns a URL t Write add_album_enrichment Add a text or location enrichment to a Google Photos album. Write add_media_to_album Add existing media items to a Google Photos album. Maximum 50 items per call. Write create_album Create a new Google Photos album Write create_album_with_media Create a new album and upload multiple local files to it in one step. Handles partial fail Write create_picker_session Create a Google Photos Picker session. Returns a pickerUri the user must open in their bro Write upload_media Upload a local media file to Google Photos. Reads bytes from filePath and creates a new me Read auth_status Check authentication status with Google Photos

All 19 Google Photos MCP Server tools →

Write tools on other servers

M-Team MCP Server download_torrent YouTube MCP Server generate_video_title Android Forensics ADB MCP Server combine_reports 0xarchive web3_signup

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 set_album_cover

What does the set_album_cover tool do? +

Set the cover photo of a Google Photos album. It is categorised as a Write tool in the Google Photos 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 set_album_cover? +

Register the Google Photos MCP Server MCP server in PolicyLayer and add a rule for set_album_cover: 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 Google Photos MCP Server. Nothing to install.

What risk level is set_album_cover? +

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

Can I rate-limit set_album_cover? +

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

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

set_album_cover is provided by the Google Photos MCP Server MCP server (savethepolarbears/google-photos-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Google Photos MCP Server tool call.

Start from Google Photos MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →