AI agents call list_services to retrieve information from Openaaas Mcp Adapter without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves information about available services in the OpenAaaS network. It is a data retrieval operation with no side effects, no code execution, no data modification, and no resource consumption beyond the query itself. The lightweight summary nature confirms it is a non-destructive read operation.
From the tool's definition Tool name 'list_services' and description '获取可用的 Agent 服务列表（轻量摘要）' (Get available Agent services list - lightweight summary) indicate a read-only query operation that retrieves and lists services without modifying or executing anything.
Documented attack patterns abuse exactly the kind of access list_services gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Openaaas Mcp Adapter, and nothing reaches the server without passing your rules. This is the rule we recommend for list_services:
{
"version": "1",
"default": "deny",
"tools": {
"list_services": {}
}
}list_services is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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获取可用的 Agent 服务列表（轻量摘要）. It is categorised as a Read tool in the Openaaas Mcp Adapter MCP Server, which means it retrieves data without modifying state.
Register the Openaaas Mcp Adapter MCP server in PolicyLayer and add a rule for list_services: 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 Openaaas Mcp Adapter. Nothing to install.
list_services 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_services 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_services. 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_services is provided by the Openaaas Mcp Adapter MCP server (wolido/openaaas). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Openaaas Mcp Adapter, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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16 Openaaas Mcp Adapter tools catalogued and risk-classified — across an index of 43,000+ MCP servers.