youtube_set_thumbnail · YouTube MCP Server MCP

WHAT IT DOES

What youtube_set_thumbnail does on YouTube MCP Server

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

WHY IT NEEDS A POLICY

Why youtube_set_thumbnail needs a policy

This tool modifies video properties (the thumbnail image) but does not delete data or execute arbitrary code. The change is reversible by uploading a different thumbnail. While misuse could defame content or mislead viewers, the impact is limited to a single video's presentation and can be quickly remediated.

From the tool's definition Tool name 'youtube_set_thumbnail' and description 'Upload a custom thumbnail for a video' indicate creation/modification of video metadata. The action is reversible—a new thumbnail can be uploaded to replace it, and the original can typically be restored.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

youtube_set_thumbnail Rate-limited

youtube_set_thumbnail 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": {
    "youtube_set_thumbnail": {
      "limits": [
        {
          "counter": "youtube_set_thumbnail_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 YouTube MCP Server, so you can run agents against it safely.

FAQ

Questions about youtube_set_thumbnail

What does the youtube_set_thumbnail tool do? +

Upload a custom thumbnail for a video. It is categorised as a Write tool in the YouTube 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 youtube_set_thumbnail? +

Register the YouTube MCP Server MCP server in PolicyLayer and add a rule for youtube_set_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 YouTube MCP Server. Nothing to install.

What risk level is youtube_set_thumbnail? +

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

Can I rate-limit youtube_set_thumbnail? +

Yes. Add a rate_limit block to the youtube_set_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 youtube_set_thumbnail completely? +

Set action: deny in the PolicyLayer policy for youtube_set_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 youtube_set_thumbnail? +

youtube_set_thumbnail is provided by the YouTube MCP Server MCP server (pauling-ai/youtube-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.