Push a value onto the right of a Redis list and optionally set an expiration time.
AI agents use rpush to create or update resources in Redis MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Redis MCP Server environment.
The rpush command modifies state by adding elements to Redis lists. This is reversible (elements can be removed via lpop, rpop, or lrem), so it falls under Write rather than Destructive.
From the tool's definition Tool name is 'rpush' with description 'Push a value onto the right of a Redis list and optionally set an expiration time.' The rpush operation creates or modifies data in Redis lists by appending values, which is a classic Write operation.
Documented attack patterns abuse exactly the kind of access rpush 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 rpush:
{
"version": "1",
"default": "deny",
"tools": {
"rpush": {
"limits": [
{
"counter": "rpush_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}rpush 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.
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Push a value onto the right of a Redis list and optionally set an expiration time. It is categorised as a Write tool in the Redis MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Redis MCP Server MCP server in PolicyLayer and add a rule for rpush: 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.
rpush is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the rpush 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 rpush. 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.
rpush 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.
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53 Redis MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.