hash_keys
Get all field names from hash. Args: key: The name of the key Returns: List of field names or error message
This record as markdown: /tools/aws/hash-keys.md
What hash_keys does on AWS
AI agents call hash_keys 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_keys is rated Low
This tool performs a read-only query operation that retrieves field names from a hash data structure. It has no side effects, does not modify data, and does not execute code or commands. The minimal blast radius from misuse would be exposure of field names, which is low-severity information disclosure. The high confidence reflects the clear read-only semantics in the description.
From the tool's definition Tool description states 'Get all field names from hash' with return value 'List of field names or error message'. The operation retrieves metadata about a hash structure without modifying, deleting, or executing code.
Attacks that exploit this kind of access
The rule that runs hash_keys 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_keys, this is the rule to start with:
hash_keys 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_keys call is checked against it from then on.
Questions about hash_keys
Get all field names from hash. Args: key: The name of the key Returns: List of field names 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_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 AWS. Nothing to install.
hash_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 hash_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 hash_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.
hash_keys 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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