redis_expire · Mcp Database MCP: Risk & Policy

WHAT IT DOES

What redis_expire does on Mcp Database

AI agents use redis_expire to create or update resources in Mcp Database — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mcp Database environment.

WHY IT NEEDS A POLICY

Why redis_expire needs a policy

redis_expire modifies Redis data by setting or updating the expiration time on existing keys. This is a Write operation because it persistently changes data state (though reversibly). It is not Destructive because the key itself remains accessible until expiration; it is not Read because it has side effects; it is not Execute because it doesn't run arbitrary code.

From the tool's definition Tool name 'redis_expire' and description 'Set expiration time for a key' indicate modification of Redis key metadata. This is a write operation that alters key properties (TTL/expiration) but is reversible (can be set again or removed with PERSIST).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

redis_expire Rate-limited

redis_expire 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "redis_expire": {
      "limits": [
        {
          "counter": "redis_expire_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Mcp Database, so you can run agents against it safely.

FAQ

Questions about redis_expire

What does the redis_expire tool do? +

Set expiration time for a key. It is categorised as a Write tool in the Mcp Database MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on redis_expire? +

Register the Mcp Database MCP server in PolicyLayer and add a rule for redis_expire: 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 Database. Nothing to install.

What risk level is redis_expire? +

redis_expire is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit redis_expire? +

Yes. Add a rate_limit block to the redis_expire 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.

How do I block redis_expire completely? +

Set action: deny in the PolicyLayer policy for redis_expire. 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.

What MCP server provides redis_expire? +

redis_expire is provided by the Mcp Database MCP server (nam088/mcp-database-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.