get_page_thumbnail

THE RISK

Low Risk

Why get_page_thumbnail needs a policy

This tool retrieves a thumbnail URL for a presentation slide—a read-only operation with no side effects on data. It does not create, modify, delete, or execute operations. The worst-case misuse would be unauthorized viewing of slide content, which is a confidentiality concern but not a high-severity capability on its own. Severity is low because thumbnail generation is non-destructive and non-financial.

From the tool's definition Tool name 'get_page_thumbnail' and description 'Generate a thumbnail URL for a specific page (slide) in a presentation' indicate retrieval of presentation metadata without modification or execution.

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

POLICY

How to control get_page_thumbnail

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_page_thumbnail": {}
  }
}

get_page_thumbnail is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

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

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about get_page_thumbnail

What does the get_page_thumbnail tool do? +

Generate a thumbnail URL for a specific page (slide) in a presentation. It is categorised as a Read tool in the VaultAssist MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_page_thumbnail? +

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

What risk level is get_page_thumbnail? +

get_page_thumbnail is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get_page_thumbnail? +

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

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

get_page_thumbnail is provided by the VaultAssist MCP server (3xcaffeine/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every VaultAssist tool call.

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

CHECK YOUR STACK →