subscribe

// MCP TOOL REFERENCE

Subscribe to a Redis channel and return a reusable subscription handle. Args: channel: The Redis channel to subscribe to. Returns: A dictionary containing the subscription ID or an error message.

ServerRedis MCP Server
CategoryExecute

How to control subscribe ↓

WHAT SUBSCRIBE ON REDIS MCP SERVER DOES

AI agents invoke subscribe to trigger actions in Redis MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

THE RISK

High Risk

Subscribing to a Redis channel is an active operation that establishes a persistent connection/listener and triggers external operations (receiving messages from that channel). It goes beyond a simple read since it creates a stateful subscription handle that persists and can receive ongoing data.

From the tool's definition Subscribe to a Redis channel and return a reusable subscription handle

Documented attack patterns abuse exactly the kind of access subscribe gives an agent:

HOW TO CONTROL SUBSCRIBE

PolicyLayer is an MCP gateway — it sits between your AI agents and Redis MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for subscribe:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "subscribe": {
      "limits": [
        {
          "counter": "subscribe_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

subscribe stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register Redis MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

More Redis MCP Server tools

Destructive delete Delete a Redis key. Args: key (str): The key to delete. Returns: Destructive hdel Delete a field from a Redis hash. Args: name: The Redis hash key. key Destructive json_del Delete a JSON value from Redis at a given path. Args: name: The Redis key whe Destructive lpop Remove and return the first element from a Redis list. Destructive lrem Remove elements from a Redis list. Args: name: The name of the list c Destructive rpop Remove and return the last element from a Redis list. Destructive srem Remove a value from a Redis set. Args: name: The Redis set key. value Destructive xdel Delete an entry from a Redis stream. Args: key (str): The stream key.

All 53 Redis MCP Server tools →

Execute tools on other servers

Frida Game Hacking MCP remove_breakpoint Procmon request_elevation WireMCP capture_packets Pentest Ai run_probe

Go deeper

High-risk tools in Redis MCP Server → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

What does the subscribe tool do? +

Subscribe to a Redis channel and return a reusable subscription handle. Args: channel: The Redis channel to subscribe to. Returns: A dictionary containing the subscription ID or an error message. It is categorised as a Execute tool in the Redis MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on subscribe? +

Register the Redis MCP Server MCP server in PolicyLayer and add a rule for subscribe: 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 Redis MCP Server. Nothing to install.

What risk level is subscribe? +

subscribe is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit subscribe? +

Yes. Add a rate_limit block to the subscribe 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 subscribe completely? +

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

subscribe is provided by the Redis MCP Server MCP server (redis/mcp-redis). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Redis MCP Server tool call.

Deterministic rules across all 53 Redis MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

GOVERN REDIS →

Free to start. No card required.

53 Redis MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.

// WHAT SUBSCRIBE ON REDIS MCP SERVER DOES

// THE RISK

// HOW TO CONTROL SUBSCRIBE

// EXPLORE