AI agents invoke chat_with_files to trigger actions in Grok MCP. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
The description is empty, which significantly lowers confidence. However, given the server context (which includes code_executor, file deletion, and vision capabilities), a tool named 'chat_with_files' likely sends file contents to an AI model for processing. This could involve reading files and executing model inference, placing it in the Execute category.
From the tool's definition Tool name 'chat_with_files' on a server that supports image understanding, code execution, and file operations. Description is empty.
Documented attack patterns abuse exactly the kind of access chat_with_files 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 chat_with_files:
{
"version": "1",
"default": "deny",
"tools": {
"chat_with_files": {
"limits": [
{
"counter": "chat_with_files_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}chat_with_files stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
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chat_with_files. It is categorised as a Execute tool in the Grok MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Grok MCP server in PolicyLayer and add a rule for chat_with_files: 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.
chat_with_files is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the chat_with_files 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 chat_with_files. 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.
chat_with_files 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.