Get list of available transcript languages for a YouTube video using yt-dlp.
AI agents call get_available_languages to retrieve information from YouTube Transcript MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves metadata about available transcripts without side effects. It performs a query operation that returns information only, matching the Read category definition of retrieving data with no side effects. The severity is low as misuse would only result in excessive queries, not data damage or unauthorized operations.
From the tool's definition The tool 'get_available_languages' fetches and returns a list of available transcript languages for a video. The description states it 'Get[s] list of available transcript languages' with no modification, deletion, or execution capabilities.
Attacks that exploit this kind of access
Get list of available transcript languages for a YouTube video using yt-dlp. It is categorised as a Read tool in the YouTube Transcript MCP Server MCP Server, which means it retrieves data without modifying state.
Register the YouTube Transcript MCP Server MCP server in PolicyLayer and add a rule for get_available_languages: 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 Transcript MCP Server. Nothing to install.
get_available_languages 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_available_languages 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_available_languages. 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_available_languages is provided by the YouTube Transcript MCP Server MCP server (suckerfish/yttranscript_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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