Fetch an existing video summary from the database
AI agents call fetchExistingVideoSummary to retrieve information from YouTube Tools MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves stored data (video summaries) from a local database without modifying, deleting, or executing any operations. It is a straightforward read operation with minimal risk—the worst case being exposure of previously stored summary information.
From the tool's definition Tool name 'fetchExistingVideoSummary' and description 'Fetch an existing video summary from the database' indicate a retrieval operation with no side effects.
Attacks that exploit this kind of access
Fetch an existing video summary from the database. It is categorised as a Read tool in the YouTube Tools MCP Server MCP Server, which means it retrieves data without modifying state.
Register the YouTube Tools MCP Server MCP server in PolicyLayer and add a rule for fetchExistingVideoSummary: 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 Tools MCP Server. Nothing to install.
fetchExistingVideoSummary 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 fetchExistingVideoSummary 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 fetchExistingVideoSummary. 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.
fetchExistingVideoSummary is provided by the YouTube Tools MCP Server MCP server (n3s-online/youtube-tools-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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