GET /api/v1/history. List or search user transcripts. Use search to find by video id, title, or transcript content.
AI agents call list_transcripts to retrieve information from Youtube Transcript without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries stored transcript metadata and content without modification, deletion, or execution of external operations. It is a pure read operation that returns search results from the user's transcript history. No data is created, modified, or destroyed.
From the tool's definition GET /api/v1/history. List or search user transcripts. Use search to find by video id, title, or transcript content.
Attacks that exploit this kind of access
GET /api/v1/history. List or search user transcripts. Use search to find by video id, title, or transcript content. It is categorised as a Read tool in the Youtube Transcript MCP Server, which means it retrieves data without modifying state.
Register the Youtube Transcript MCP server in PolicyLayer and add a rule for list_transcripts: 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. Nothing to install.
list_transcripts 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 list_transcripts 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 list_transcripts. 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.
list_transcripts is provided by the Youtube Transcript MCP server (youtube-transcript-dev/youtube-transcript-mcp). 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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