List all active MCP server sessions with their IDs and targets.
AI agents call inspector_list_sessions to retrieve information from Mcp Inspector without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and displays metadata about active sessions without modifying, deleting, or executing any operations. It is purely informational and read-only, similar to other list operations (inspector_list_tools, inspector_list_resources) on this MCP Inspector server.
From the tool's definition Tool name 'inspector_list_sessions' and description 'List all active MCP server sessions with their IDs and targets' indicate a query/listing operation with no side effects.
Attacks that exploit this kind of access
List all active MCP server sessions with their IDs and targets. It is categorised as a Read tool in the Mcp Inspector MCP Server, which means it retrieves data without modifying state.
Register the Mcp Inspector MCP server in PolicyLayer and add a rule for inspector_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 Mcp Inspector. Nothing to install.
inspector_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 inspector_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 inspector_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.
inspector_list_sessions is provided by the Mcp Inspector MCP server (@fre4x/mcp-inspector). 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 →