hash_values
Get all values from hash. Args: key: The name of the key Returns: List of values or error message
This record as markdown: /tools/aws/hash-values.md
What hash_values does on AWS
AI agents call hash_values 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_values is rated Low
The tool queries and retrieves data from a hash structure without creating, modifying, deleting, or executing anything. It is a read-only operation. Severity is low because retrieving hash values poses minimal risk unless the hash contains highly sensitive data, but the operation itself is non-destructive and non-executable.
From the tool's definition Tool description states 'Get all values from hash' with a key argument and returns 'List of values or error message'. This is a retrieval operation with no side effects.
Attacks that exploit this kind of access
The rule that runs hash_values 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_values, this is the rule to start with:
hash_values 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_values call is checked against it from then on.
Questions about hash_values
Get all values from hash. Args: key: The name of the key Returns: List of values 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_values: 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_values 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_values 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_values. 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_values 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.
More on AWS, and thousands of servers like it.
This server
Across the catalogue