List all Grok language and image models with live pricing from the xAI API.
AI agents call list_models to retrieve information from Grok MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves static information about available models and their pricing. It is a read-only operation that queries the xAI API for informational purposes without creating, modifying, deleting, executing code, or performing financial transactions. No data is being written or altered, and no external operations are triggered.
From the tool's definition Tool name is 'list_models' and description states it 'List all Grok language and image models with live pricing from the xAI API.' The verb 'list' and the read-only nature of retrieving model metadata and pricing information indicate a query operation with no…
Documented attack patterns abuse exactly the kind of access list_models gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Grok MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for list_models:
{
"version": "1",
"default": "deny",
"tools": {
"list_models": {}
}
}list_models is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all Grok language and image models with live pricing from the xAI API. It is categorised as a Read tool in the Grok MCP MCP Server, which means it retrieves data without modifying state.
Register the Grok MCP server in PolicyLayer and add a rule for list_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 Grok MCP. Nothing to install.
list_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_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_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_models is provided by the Grok MCP server (merterbak/grok-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Grok MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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22 Grok MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.