AI agents use use_provider to create or update resources in MemGPT MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your MemGPT MCP Server environment.
This tool changes the state of the system by selecting which LLM provider to use going forward, a reversible write operation. It does not read data (Read), execute external code or queries (Execute), delete anything (Destructive), or involve financial transactions (Financial).
From the tool's definition Tool name 'use_provider' and description 'Switch to a different LLM provider' indicate modification of a configuration setting—the active LLM provider for the session.
Documented attack patterns abuse exactly the kind of access use_provider gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and MemGPT MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for use_provider:
{
"version": "1",
"default": "deny",
"tools": {
"use_provider": {
"limits": [
{
"counter": "use_provider_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}use_provider stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Switch to a different LLM provider. It is categorised as a Write tool in the MemGPT MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the MemGPT MCP Server MCP server in PolicyLayer and add a rule for use_provider: 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 MemGPT MCP Server. Nothing to install.
use_provider is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the use_provider 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 use_provider. 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.
use_provider is provided by the MemGPT MCP Server MCP server (vic563/memgpt-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from MemGPT MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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5 MemGPT MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.