List available search providers, provider profiles, goggles presets, and setup hints.
AI agents call list_providers to retrieve information from Cross Validated Search without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and enumerates configuration metadata (available providers and their profiles) without modifying, deleting, executing code, or performing financial operations. It is a passive information-gathering action, clearly fitting the Read category with low severity and blast radius.
From the tool's definition Tool name 'list_providers' and description 'List available search providers, provider profiles, goggles presets, and setup hints' indicate a query/retrieval operation with no side effects.
Documented attack patterns abuse exactly the kind of access list_providers gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Cross Validated Search, and nothing reaches the server without passing your rules. This is the rule we recommend for list_providers:
{
"version": "1",
"default": "deny",
"tools": {
"list_providers": {}
}
}list_providers is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List available search providers, provider profiles, goggles presets, and setup hints. It is categorised as a Read tool in the Cross Validated Search MCP Server, which means it retrieves data without modifying state.
Register the Cross Validated Search MCP server in PolicyLayer and add a rule for list_providers: 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 Cross Validated Search. Nothing to install.
list_providers 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_providers 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_providers. 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_providers is provided by the Cross Validated Search MCP server (wd041216-bit/zero-api-key-web-search). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Cross Validated Search, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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8 Cross Validated Search tools catalogued and risk-classified — across an index of 43,000+ MCP servers.