redis_stream_add · RedisNexus MCP: Risk & Policy

WHAT IT DOES

What redis_stream_add does on RedisNexus

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

WHY IT NEEDS A POLICY

Why redis_stream_add needs a policy

This tool creates or modifies data by appending entries to a Redis Stream. It is reversible (entries can be deleted), so it does not qualify as Destructive. It does not execute arbitrary code, delete data, or move money. Write is the appropriate category.

From the tool's definition Tool name 'redis_stream_add' and description 'Add an entry to a Redis Stream' indicate data creation/modification. Streams are append-only logs, making this a write operation that creates new entries reversibly.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

redis_stream_add Rate-limited

redis_stream_add 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_stream_add": {
      "limits": [
        {
          "counter": "redis_stream_add_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 RedisNexus, so you can run agents against it safely.

FAQ

Questions about redis_stream_add

What does the redis_stream_add tool do? +

Add an entry to a Redis Stream. Streams are append-only logs ideal for. It is categorised as a Write tool in the RedisNexus 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_stream_add? +

Register the RedisNexus MCP server in PolicyLayer and add a rule for redis_stream_add: 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 RedisNexus. Nothing to install.

What risk level is redis_stream_add? +

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

Can I rate-limit redis_stream_add? +

Yes. Add a rate_limit block to the redis_stream_add 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_stream_add completely? +

Set action: deny in the PolicyLayer policy for redis_stream_add. 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_stream_add? +

redis_stream_add is provided by the RedisNexus MCP server (rajkumar-madhu/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.