AI agents call list_credentials to retrieve information from Waiaas without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves/lists credentials without modifying them, placing it in the Read category. However, severity is high because credentials represent sensitive authentication material for a wallet server handling multi-chain crypto operations—exposure of these credentials could enable unauthorized transactions.
From the tool's definition Tool name 'list_credentials' indicates a retrieval operation that queries and returns stored credentials. The empty description is uninformative, but the function name strongly suggests a Read operation that enumerates sensitive authentication material.
Documented attack patterns abuse exactly the kind of access list_credentials gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Waiaas, and nothing reaches the server without passing your rules. This is the rule we recommend for list_credentials:
{
"version": "1",
"default": "deny",
"tools": {
"list_credentials": {}
}
}list_credentials is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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list_credentials. It is categorised as a Read tool in the Waiaas MCP Server, which means it retrieves data without modifying state.
Register the Waiaas MCP server in PolicyLayer and add a rule for list_credentials: 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 Waiaas. Nothing to install.
list_credentials 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_credentials 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_credentials. 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_credentials is provided by the Waiaas MCP server (minhoyoo-iotrust/waiaas). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Waiaas, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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126 Waiaas tools catalogued and risk-classified — across an index of 43,000+ MCP servers.