Subscribe to Redis channels using a pattern. Args: pattern: The Redis channel pattern to subscribe to. Returns: A dictionary containing the subscription ID or an error message.
AI agents call psubscribe to retrieve information from Redis MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
psubscribe is a Redis Pub/Sub operation that allows listening to channel messages matching a pattern. It retrieves/observes data streams without side effects—no creation, modification, deletion, code execution, or financial impact. The agent can only receive messages from matching channels, making this a Read operation with low severity and blast radius.
From the tool's definition Tool name 'psubscribe' and description 'Subscribe to Redis channels using a pattern' indicates passive subscription/listening to channel messages. Returns subscription ID or error message with no data modification or deletion.
Documented attack patterns abuse exactly the kind of access psubscribe gives an agent:
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 psubscribe:
{
"version": "1",
"default": "deny",
"tools": {
"psubscribe": {}
}
}psubscribe is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Subscribe to Redis channels using a pattern. Args: pattern: The Redis channel pattern to subscribe to. Returns: A dictionary containing the subscription ID or an error message. It is categorised as a Read tool in the Redis MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Redis MCP Server MCP server in PolicyLayer and add a rule for psubscribe: 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.
psubscribe 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 psubscribe 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 psubscribe. 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.
psubscribe 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.
Deterministic rules across all 53 Redis MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
53 Redis MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.