Fetch a stored chat completion from xAI by its response ID.
AI agents call retrieve_stateful_response 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 previously stored data (a chat completion response) by ID. The verb 'Fetch' and the absence of any modification, deletion, or execution capability clearly place this in the Read category. The blast radius is minimal—an agent retrieving a cached response poses no risk of data loss, financial harm, or code execution. Severity is low because the operation is purely informational and non-destructive.
From the tool's definition Tool name 'retrieve_stateful_response' and description 'Fetch a stored chat completion from xAI by its response ID' indicate data retrieval with no modification or side effects.
Documented attack patterns abuse exactly the kind of access retrieve_stateful_response 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 retrieve_stateful_response:
{
"version": "1",
"default": "deny",
"tools": {
"retrieve_stateful_response": {}
}
}retrieve_stateful_response is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Fetch a stored chat completion from xAI by its response ID. 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 retrieve_stateful_response: 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.
retrieve_stateful_response 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 retrieve_stateful_response 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 retrieve_stateful_response. 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.
retrieve_stateful_response 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.