Get top-level comments for a YouTube video.
AI agents call youtube_comments 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 and queries existing comment data from YouTube videos. It performs a read-only operation that retrieves information without creating, modifying, deleting, or executing any actions. The data retrieved is publicly available on YouTube, and the tool has no capacity to alter state or trigger external operations.
From the tool's definition Tool name 'youtube_comments' and description 'Get top-level comments for a YouTube video' indicate retrieval of publicly available data with no modification or side effects.
Attacks that exploit this kind of access
Get top-level comments 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_comments: 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_comments 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_comments 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_comments. 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_comments 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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