AI agents call plex_get_on_deck to retrieve information from Nas without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves or queries data about media items marked as 'on deck' (in-progress or to-resume) without modifying, deleting, or executing any operations. It is a read-only query operation with no side effects.
From the tool's definition Tool name 'plex_get_on_deck' and description 'Récupère les médias À suivre (en cours de visionnage, à reprendre)' [Retrieves media 'On Deck' (currently watching, to resume)] indicate a retrieval operation that queries the state of media in a Plex library.
Attacks that exploit this kind of access
Récupère les médias 'À suivre' (en cours de visionnage, à reprendre). It is categorised as a Read tool in the Nas MCP Server, which means it retrieves data without modifying state.
Register the Nas MCP server in PolicyLayer and add a rule for plex_get_on_deck: 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 Nas. Nothing to install.
plex_get_on_deck 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 plex_get_on_deck 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 plex_get_on_deck. 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.
plex_get_on_deck is provided by the Nas MCP server (matthieurosset/nas-mcp-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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