AI agents use set_default_server to create or update resources in Openaaas Mcp Adapter — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Openaaas Mcp Adapter environment.
The tool modifies user or system configuration (the default server setting) without deleting or destroying data. This is categorized as Write because it creates or modifies data reversibly. Severity is medium because a misconfigured default server could redirect subsequent operations to unintended services, potentially causing confusion or unintended side effects, but the action itself is easily reversible.
From the tool's definition Tool name 'set_default_server' and description '切换默认服务器' (switch/change default server) indicate modification of configuration state. This is a reversible write operation that changes which server is used by default.
Documented attack patterns abuse exactly the kind of access set_default_server 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 set_default_server:
{
"version": "1",
"default": "deny",
"tools": {
"set_default_server": {
"limits": [
{
"counter": "set_default_server_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}set_default_server stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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切换默认服务器. It is categorised as a Write tool in the Openaaas Mcp Adapter MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Openaaas Mcp Adapter MCP server in PolicyLayer and add a rule for set_default_server: 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.
set_default_server is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the set_default_server 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 set_default_server. 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.
set_default_server 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.