AI agents call list_sessions to retrieve information from Vivado 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 information about active Vivado sessions and their states. It performs data retrieval without creating, modifying, deleting, or executing any operations. The absence of side effects and the purely informational nature of querying session status place it firmly in the Read category.
From the tool's definition Tool name 'list_sessions' and description '列出所有活跃的 Vivado 会话及其状态' (List all active Vivado sessions and their status) indicate a query/retrieval operation with no side effects.
Documented attack patterns abuse exactly the kind of access list_sessions gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Vivado, and nothing reaches the server without passing your rules. This is the rule we recommend for list_sessions:
{
"version": "1",
"default": "deny",
"tools": {
"list_sessions": {}
}
}list_sessions is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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列出所有活跃的 Vivado 会话及其状态。. It is categorised as a Read tool in the Vivado MCP Server, which means it retrieves data without modifying state.
Register the Vivado 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 Vivado. 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 Vivado MCP server (mapleleavessssssss-wq/vivado-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Vivado, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
27 Vivado tools catalogued and risk-classified — across an index of 43,000+ MCP servers.