hash_random_field
Get random field(s) from hash. Args: key: The name of the key count: Number of fields to return (optional) Returns: Random field(s) or error message
This record as markdown: /tools/aws/hash-random-field.md
What hash_random_field does on AWS
AI agents call hash_random_field to retrieve information from AWS without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why hash_random_field is rated Low
This is a read operation that queries data from a hash structure. No data is created, modified, deleted, or executed. The operation is purely informational with no side effects. Low severity because misuse would only expose potentially sensitive hash contents, not cause irreversible harm or external effects.
From the tool's definition Tool returns random field(s) from a hash with no modification capability. Description states 'Get random field(s)' indicating a retrieval operation. Arguments are read-only (key name and count), with no destructive or mutating operations possible.
Attacks that exploit this kind of access
The rule that runs hash_random_field safely
PolicyLayer is an MCP gateway: it sits between your AI agents and AWS, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For hash_random_field, this is the rule to start with:
hash_random_field is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect AWS, apply this rule, and every hash_random_field call is checked against it from then on.
Questions about hash_random_field
Get random field(s) from hash. Args: key: The name of the key count: Number of fields to return (optional) Returns: Random field(s) or error message. It is categorised as a Read tool in the AWS MCP Server, which means it retrieves data without modifying state.
Register the AWS MCP server in PolicyLayer and add a rule for hash_random_field: 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 AWS. Nothing to install.
hash_random_field 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 hash_random_field 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_random_field. 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_random_field is provided by the AWS MCP server (@awslabs/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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