AI agents call scan_all_keys 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.
The tool performs key enumeration in Redis, a read operation that queries the data store without side effects. Comparable sibling tools like 'get_indexes' and 'get_indexed_keys_number' are similarly read-only. While the empty description lowers confidence slightly, the semantic meaning of 'scan' combined with the read-only tool siblings strongly indicates this is a retrieval operation.
From the tool's definition Tool name 'scan_all_keys' indicates iteration/enumeration of Redis keys with no modification. The description is empty, but the name alone suggests a read-only operation consistent with Redis SCAN commands.
Documented attack patterns abuse exactly the kind of access scan_all_keys 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 scan_all_keys:
{
"version": "1",
"default": "deny",
"tools": {
"scan_all_keys": {}
}
}scan_all_keys is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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scan_all_keys. 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 scan_all_keys: 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.
scan_all_keys 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 scan_all_keys 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 scan_all_keys. 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.
scan_all_keys 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.