Set a Redis string value with an optional expiration time. Args: key (str): The key to set. value (str, bytes, int, float, dict): The value to store. expiration (int, optional): Expiration time in seconds. Returns: str: Confirmation message or an error message.
AI agents use set 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 'set' operation creates or updates a Redis key-value pair, which is a reversible write operation. It does not execute arbitrary code, delete data irreversibly, or involve financial transactions.
From the tool's definition Tool description states 'Set a Redis string value' which creates or modifies data. The function accepts a key and value to store with optional expiration, enabling reversible data modification without deletion or destruction.
Documented attack patterns abuse exactly the kind of access set 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 set:
{
"version": "1",
"default": "deny",
"tools": {
"set": {
"limits": [
{
"counter": "set_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}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.
Free to start. No card required.
Set a Redis string value with an optional expiration time. Args: key (str): The key to set. value (str, bytes, int, float, dict): The value to store. expiration (int, optional): Expiration time in seconds. Returns: str: Confirmation message or an error message. 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 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 Redis MCP Server. Nothing to install.
set 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 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.
Set action: deny in the PolicyLayer policy for 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.
set 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.