列出当前所有已连接的仪器别名。
AI agents call list_sessions to retrieve information from Instrument MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only reads and enumerates the state of connected instruments. It has no side effects, cannot modify or delete data, and poses minimal risk if invoked by an AI agent. The worst-case scenario is information disclosure of which instruments are currently active, which is informational only.
From the tool's definition Tool name 'list_sessions' and description '列出当前所有已连接的仪器别名' (List all currently connected instrument aliases) — purely retrieves a list of connected instruments without modifying, deleting, or executing any operations.
Attacks that exploit this kind of access
列出当前所有已连接的仪器别名。. It is categorised as a Read tool in the Instrument MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Instrument MCP Server 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 Instrument MCP Server. 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 Instrument MCP Server MCP server (zeng-andrew/instrument-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 →