redis_set · Mcp Database MCP: Risk & Policy

WHAT IT DOES

What redis_set does on Mcp Database

AI agents use redis_set 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_set needs a policy

redis_set creates or modifies data in Redis reversibly. While it changes state, it is not destructive (data can be overwritten or deleted later), not financial, and not code execution. The medium severity reflects that Redis data modification could impact application state or cached data, but the blast radius depends on what data is stored and how it's used.

From the tool's definition Tool name 'redis_set' and description 'Set value of a Redis key' indicate a write operation that modifies data in Redis by setting/updating key-value pairs.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

redis_set Rate-limited

redis_set 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_set": {
      "limits": [
        {
          "counter": "redis_set_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

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_set

What does the redis_set tool do? +

Set value of a Redis 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_set? +

Register the Mcp Database MCP server in PolicyLayer and add a rule for redis_set: 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_set? +

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

Can I rate-limit redis_set? +

Yes. Add a rate_limit block to the redis_set 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_set completely? +

Set action: deny in the PolicyLayer policy for redis_set. 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_set? +

redis_set 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.