AI agents call list_sessions to retrieve information from Rn Debug without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a passive read operation to enumerate active debugging sessions. It has no side effects, does not execute code or commands, does not modify state, and does not delete or move resources. The blast radius of misuse is minimal—an attacker could only gain visibility into which sessions are active, not control them or access sensitive data beyond that metadata.
From the tool's definition Tool name 'list_sessions' and description 'List all active MCP device sessions' indicate a query operation that retrieves session information without modifying or executing anything.
Attacks that exploit this kind of access
List all active MCP device sessions. It is categorised as a Read tool in the Rn Debug MCP Server, which means it retrieves data without modifying state.
Register the Rn Debug MCP server in PolicyLayer and add a rule for list_sessions: 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 Rn Debug. Nothing to install.
list_sessions 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_sessions 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_sessions. 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_sessions is provided by the Rn Debug MCP server (rn-debug-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.
Teams ship this data inside their own products. See what a licence covers →