Retrieve a vector from a Redis hash and convert it back from binary blob. Args: name: The Redis hash key. vector_field: The field name inside the hash. Unless specifically required, use the default field name Returns: The vector as a list of floats, or an error message if retrieval fails.
AI agents call get_vector_from_hash 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.
This tool retrieves and converts data from Redis without creating, modifying, or deleting anything. It has no side effects on the data store. The retrieval of a vector from a hash is a pure read operation with minimal blast radius if misused—the worst case would be unauthorized data access to existing vectors.
From the tool's definition Tool description states 'Retrieve a vector from a Redis hash' with no mention of modification, deletion, or execution. The operation is a read-only query that returns data (vector as list of floats) without side effects.
Documented attack patterns abuse exactly the kind of access get_vector_from_hash 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 get_vector_from_hash:
{
"version": "1",
"default": "deny",
"tools": {
"get_vector_from_hash": {}
}
}get_vector_from_hash is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Retrieve a vector from a Redis hash and convert it back from binary blob. Args: name: The Redis hash key. vector_field: The field name inside the hash. Unless specifically required, use the default field name Returns: The vector as a list of floats, or an error message if retrieval fails. 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 get_vector_from_hash: 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.
get_vector_from_hash 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 get_vector_from_hash 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 get_vector_from_hash. 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.
get_vector_from_hash 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.