AI agents call get_transcript to retrieve information from Youtube Research without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves publicly available transcript data from YouTube videos without creating, modifying, or deleting any data. It is a simple read operation with no side effects. The severity is low because transcript access is non-sensitive data retrieval that does not enable harm even if misused by an AI agent.
From the tool's definition Tool name 'get_transcript' and description 'Fetch a YouTube transcript by URL or video ID' indicate data retrieval with no modification, deletion, or code execution.
Documented attack patterns abuse exactly the kind of access get_transcript gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Youtube Research, and nothing reaches the server without passing your rules. This is the rule we recommend for get_transcript:
{
"version": "1",
"default": "deny",
"tools": {
"get_transcript": {}
}
}get_transcript is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Fetch a YouTube transcript by URL or video ID. It is categorised as a Read tool in the Youtube Research MCP Server, which means it retrieves data without modifying state.
Register the Youtube Research MCP server in PolicyLayer and add a rule for get_transcript: 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 Research. Nothing to install.
get_transcript is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get_transcript 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.
Set action: deny in the PolicyLayer policy for get_transcript. 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.
get_transcript is provided by the Youtube Research MCP server (lee-s-dev/youtube-research-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Youtube Research, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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10 Youtube Research tools catalogued and risk-classified — across an index of 43,000+ MCP servers.