AI agents call set_members to retrieve information from MCP Server Redis without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only reads and returns the members of a Redis set (equivalent to the SMEMBERS command). It performs no modifications, deletions, or external operations. Severity is low because it only exposes set membership data, though sensitive data could theoretically be stored in Redis sets.
From the tool's definition "Get all members of a Redis set" — retrieves data with no side effects
Documented attack patterns abuse exactly the kind of access set_members gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and MCP Server Redis, and nothing reaches the server without passing your rules. This is the rule we recommend for set_members:
{
"version": "1",
"default": "deny",
"tools": {
"set_members": {}
}
}set_members is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get all members of a Redis set. It is categorised as a Read tool in the MCP Server Redis MCP Server, which means it retrieves data without modifying state.
Register the MCP Server Redis MCP server in PolicyLayer and add a rule for set_members: 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 MCP Server Redis. Nothing to install.
set_members 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 set_members 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 set_members. 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.
set_members is provided by the MCP Server Redis MCP server (prajwalnayak7/mcp-server-redis). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from MCP Server Redis, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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10 MCP Server Redis tools catalogued and risk-classified — across an index of 43,000+ MCP servers.