Get all fields and values from hash. Args: key: The name of the key Returns: Dictionary of field-value pairs or error message
AI agents call hash_get_all to retrieve information from AWS without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves data from a hash data structure without creating, modifying, deleting, or executing any operations. It is a straightforward read/query operation with minimal blast radius—an AI agent misusing it could only over-query or expose data already accessible through the tool, but cannot cause infrastructure damage or data loss.
From the tool's definition Tool name 'hash_get_all' and description 'Get all fields and values from hash' indicate a retrieval operation with no modification or side effects. The return value is a 'Dictionary of field-value pairs', confirming read-only semantics.
Risk signalsBulk/mass operation — affects multiple targets
Documented attack patterns abuse exactly the kind of access hash_get_all gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and AWS, and nothing reaches the server without passing your rules. This is the rule we recommend for hash_get_all:
{
"version": "1",
"default": "deny",
"tools": {
"hash_get_all": {}
}
}hash_get_all is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get all fields and values from hash. Args: key: The name of the key Returns: Dictionary of field-value pairs 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_get_all: 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_get_all 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_get_all 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_get_all. 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_get_all 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.
Start from AWS, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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300 AWS tools catalogued and risk-classified — across an index of 43,000+ MCP servers.