youtube_upload_caption · Youtube MCP: Risk & Policy

WHAT IT DOES

What youtube_upload_caption does on Youtube

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

WHY IT NEEDS A POLICY

Why youtube_upload_caption needs a policy

Uploading captions creates or adds metadata to a video reversibly—captions can be edited, replaced, or deleted later. This is a Write operation (not Read because it modifies state, not Execute because it doesn't run arbitrary code, not Destructive because captions aren't irreversibly deleted).

From the tool's definition Tool uploads a new caption track to a YouTube video; the verb 'upload' combined with 'new' indicates creation of content; 'from a local file' confirms the mechanism that copies external data into the platform.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

youtube_upload_caption Rate-limited

youtube_upload_caption 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_upload_caption": {
      "limits": [
        {
          "counter": "youtube_upload_caption_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, so you can run agents against it safely.

FAQ

Questions about youtube_upload_caption

What does the youtube_upload_caption tool do? +

Upload a new caption track to a YouTube video from a local file. The file is streamed directly from disk via \. It is categorised as a Write tool in the Youtube 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_upload_caption? +

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

What risk level is youtube_upload_caption? +

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

Can I rate-limit youtube_upload_caption? +

Yes. Add a rate_limit block to the youtube_upload_caption 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_upload_caption completely? +

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

youtube_upload_caption is provided by the Youtube MCP server (tuitamogamer-gpt/youtube-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.