AI agents call list_sources to retrieve information from Obs without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and enumerates scene items/sources in OBS Studio without modifying, deleting, or executing any actions. It is a read-only operation similar to 'list_scenes' and other enumeration tools on this server. The default behavior (targeting the current scene) does not change the assessment. Severity is low because listing scene contents poses minimal risk even if misused by an AI agent.
From the tool's definition Tool name is 'list_sources' and description states it 'List all sources (scene items) in a scene' — a pure query operation with no side effects.
Attacks that exploit this kind of access
List all sources (scene items) in a scene. Defaults to the current scene. It is categorised as a Read tool in the Obs MCP Server, which means it retrieves data without modifying state.
Register the Obs MCP server in PolicyLayer and add a rule for list_sources: 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 Obs. Nothing to install.
list_sources 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_sources 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_sources. 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_sources is provided by the Obs MCP server (larscangit/obs-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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