youtube_getCaption

THE RISK

Low Risk

Why youtube_getCaption needs a policy

This tool queries and returns existing video caption/transcript data without side effects. It matches the Read category definition: 'retrieves or queries data; no side effects.' The severity is low because caption/transcript retrieval poses minimal risk—it accesses publicly available or authorized video metadata without financial impact, code execution, or data destruction.

From the tool's definition Tool retrieves video captions/transcripts via 'Get video captions/transcript' with parameters for URL, locale, model, and extension. No modification, deletion, or code execution occurs—purely data retrieval.

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

POLICY

How to control youtube_getCaption

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

policy.json

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

youtube_getCaption 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 VidCap YouTube API 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.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More VidCap YouTube API MCP Server tools

Read youtube_getComments Get YouTube video comments with optional pagination and replies. Provide a YouTube video I Read youtube_getInfo Get and save YouTube video information. Provide a YouTube video URL. Read youtube_getMedia Get available media formats for a YouTube video. Provide a YouTube video URL. Read youtube_getScreenshot Get screenshot from video at specific timestamp. Provide a YouTube video URL and optionall Read youtube_getScreenshotMultiple Get multiple screenshots from video at different timestamps. Provide a YouTube video URL a Read youtube_getSummary Get AI-generated summary of video content. Provide a YouTube video URL and optionally loca Read youtube_search Search YouTube videos with query and optional filters. Provide search query and optional p

All 8 VidCap YouTube API MCP Server tools →

Read tools on other servers

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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 youtube_getCaption

What does the youtube_getCaption tool do? +

Get video captions/transcript. Provide a YouTube video URL and optionally locale, model, and extension. It is categorised as a Read tool in the VidCap YouTube API MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on youtube_getCaption? +

Register the VidCap YouTube API MCP Server MCP server in PolicyLayer and add a rule for youtube_getCaption: 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 VidCap YouTube API MCP Server. Nothing to install.

What risk level is youtube_getCaption? +

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

Can I rate-limit youtube_getCaption? +

Yes. Add a rate_limit block to the youtube_getCaption 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_getCaption completely? +

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

youtube_getCaption is provided by the VidCap YouTube API MCP Server MCP server (mrgoonie/vidcap-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 VidCap YouTube API MCP Server tool call.

Start from VidCap YouTube API 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 →