AI agents call list_elements to retrieve information from Gst without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a pure read operation that retrieves metadata about available GStreamer elements in the system. It has no side effects, does not execute code or pipelines, does not create or modify data, and does not delete anything. The blast radius of misuse is minimal—an agent cannot harm the system by listing elements. Filtering is a read-time operation without side effects.
From the tool's definition Tool name 'list_elements' and description 'List available GStreamer elements' indicate a retrieval operation that queries and enumerates existing GStreamer elements with optional filtering by category.
Attacks that exploit this kind of access
List available GStreamer elements, optionally filtered by category (source, sink, decoder, encoder, muxer, demuxer, filter, parser, other). It is categorised as a Read tool in the Gst MCP Server, which means it retrieves data without modifying state.
Register the Gst MCP server in PolicyLayer and add a rule for list_elements: 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 Gst. Nothing to install.
list_elements 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_elements 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_elements. 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_elements is provided by the Gst MCP server (wizenink/gst-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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