Create a consumer group for a Redis stream. Args: key (str): The stream key. group_name (str): The consumer group name. start_id (str, optional): Stream ID from which the group starts consuming. mkstream (bool, optional): Create the stream if it does not exist. Returns: str: Confirmation message ...
AI agents use xgroup_create to create or update resources in Redis MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Redis MCP Server environment.
This tool creates new data structures (consumer groups and optionally streams) in Redis, which are reversible modifications. It does not delete data (hence not Destructive), does not execute arbitrary code or queries (hence not Execute), and does not involve financial transactions (hence not Financial).
From the tool's definition Creates a consumer group for a Redis stream (xgroup_create with args: key, group_name, start_id, mkstream).
Documented attack patterns abuse exactly the kind of access xgroup_create gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Redis MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for xgroup_create:
{
"version": "1",
"default": "deny",
"tools": {
"xgroup_create": {
"limits": [
{
"counter": "xgroup_create_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}xgroup_create 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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Create a consumer group for a Redis stream. Args: key (str): The stream key. group_name (str): The consumer group name. start_id (str, optional): Stream ID from which the group starts consuming. mkstream (bool, optional): Create the stream if it does not exist. Returns: str: Confirmation message or an error message. It is categorised as a Write tool in the Redis MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Redis MCP Server MCP server in PolicyLayer and add a rule for xgroup_create: 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 Redis MCP Server. Nothing to install.
xgroup_create 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 xgroup_create 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 xgroup_create. 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.
xgroup_create is provided by the Redis MCP Server MCP server (redis/mcp-redis). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 53 Redis MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
53 Redis MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.