Fetch a YouTube video page and extract its captions/transcript
AI agents call fetch_youtube_transcript to retrieve information from Mcp Fetch Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves existing public transcript data from YouTube videos. It has no side effects on the video, the transcript, user accounts, or any other system state. The operation is read-only and purely informational. Severity is low because even if misused by an AI agent, it can only access publicly available captions/transcripts—no destructive, financial, or privileged operations are possible.
From the tool's definition Tool name is 'fetch_youtube_transcript' and description states it 'Fetch[es] a YouTube video page and extract[s] its captions/transcript'. The verb 'fetch' and 'extract' indicate data retrieval with no modification, creation, deletion, or code execution.
Attacks that exploit this kind of access
Fetch a YouTube video page and extract its captions/transcript. It is categorised as a Read tool in the Mcp Fetch Server MCP Server, which means it retrieves data without modifying state.
Register the Mcp Fetch Server MCP server in PolicyLayer and add a rule for fetch_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 Mcp Fetch Server. Nothing to install.
fetch_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 fetch_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 fetch_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.
fetch_youtube_transcript is provided by the Mcp Fetch Server MCP server (mcp-fetch-server). 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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