AI agents call redis_memory_usage to retrieve information from Db without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves memory usage statistics for a Redis key. It performs a read-only query with no side effects, no data modification, and no destructive capability. The blast radius of misuse is minimal — at worst it exposes memory size metadata about Redis keys.
From the tool's definition 获取 Redis 键的内存占用字节数 — '获取' means 'get/retrieve', indicating a read-only operation that returns memory usage in bytes for a Redis key
Documented attack patterns abuse exactly the kind of access redis_memory_usage gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Db, and nothing reaches the server without passing your rules. This is the rule we recommend for redis_memory_usage:
{
"version": "1",
"default": "deny",
"tools": {
"redis_memory_usage": {}
}
}redis_memory_usage is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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获取 Redis 键的内存占用字节数. It is categorised as a Read tool in the Db MCP Server, which means it retrieves data without modifying state.
Register the Db MCP server in PolicyLayer and add a rule for redis_memory_usage: 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 Db. Nothing to install.
redis_memory_usage 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 redis_memory_usage 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 redis_memory_usage. 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.
redis_memory_usage is provided by the Db MCP server (wannanbigpig/db-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Db, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
34 Db tools catalogued and risk-classified — across an index of 43,000+ MCP servers.