List all available free models with quality scores and availability status.
AI agents call list_free_models to retrieve information from OpenRouter MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only query to enumerate and display information about free AI models. It has no side effects, does not execute code, does not create or modify data, and does not affect financial systems. The blast radius of misuse is minimal—an agent could at worst receive a list of available models, which is informational only.
From the tool's definition Tool name 'list_free_models' and description 'List all available free models with quality scores and availability status' indicate a retrieval operation that queries available models without modifying, executing, or deleting data.
Documented attack patterns abuse exactly the kind of access list_free_models gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and OpenRouter MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_free_models:
{
"version": "1",
"default": "deny",
"tools": {
"list_free_models": {}
}
}list_free_models is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
List all available free models with quality scores and availability status. It is categorised as a Read tool in the OpenRouter MCP Server MCP Server, which means it retrieves data without modifying state.
Register the OpenRouter MCP Server MCP server in PolicyLayer and add a rule for list_free_models: 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 OpenRouter MCP Server. Nothing to install.
list_free_models 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_free_models 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_free_models. 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_free_models is provided by the OpenRouter MCP Server MCP server (physics91/openrouter-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from OpenRouter MCP Server, 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.
9 OpenRouter MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.