删除哈希字段
AI agents call hash_del to permanently remove resources in Redis MCP — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
The tool deletes specific fields from a Redis hash, which is an irreversible operation. While it operates at the field level rather than entire key level, deletion of hash fields cannot be undone without a backup/restore operation. Severity is medium as it targets specific fields rather than entire datasets or databases.
From the tool's definition Tool name 'hash_del' and description '删除哈希字段' (meaning 'delete hash field') indicate irreversible deletion of hash fields from Redis.
Attacks that exploit this kind of access
删除哈希字段. It is categorised as a Destructive tool in the Redis MCP MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Redis MCP server in PolicyLayer and add a rule for hash_del: 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. Nothing to install.
hash_del is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the hash_del 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 hash_del. 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.
hash_del is provided by the Redis MCP server (pickstar-2002/redis-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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