Get subtitles/transcript for a YouTube video.
AI agents call youtube_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 is a straightforward data retrieval operation. It queries YouTube for existing transcript/subtitle information and returns it to the user. No data is created, modified, deleted, or externally executed. The transcript is read-only content already published by the video creator, and fetching it has no impact on the platform or data integrity.
From the tool's definition Tool is described as 'Get subtitles/transcript for a YouTube video' — this retrieves publicly available video transcript data with no side effects, modifications, or external operations.
Attacks that exploit this kind of access
Get subtitles/transcript for a YouTube video. 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 youtube_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.
youtube_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 youtube_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 youtube_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.
youtube_transcript is provided by the Youtube Research MCP server (plaguedoctor39/youtube-research). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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