hash_get

THE RISK

Low Risk

Why hash_get needs a policy

This tool performs a simple read operation on a hash data structure, retrieving a field value by key. It has no capability to modify, delete, or execute code. The sibling tools include destructive operations (delete_*), write operations (attach_*, add_*), and execute operations (analyze_*, audit_*), but hash_get is purely a retrieval function, making it a Read category risk with low severity.

From the tool's definition Tool description states 'Get field from hash' with returns 'Field value or error message'. The verb 'Get' and the operation of retrieving a field value indicate data retrieval with no modification or side effects.

Documented attack patterns abuse exactly the kind of access hash_get gives an agent:

POLICY

How to control hash_get

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:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "hash_get": {}
  }
}

hash_get is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register AWS — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

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EXPLORE

Related tools and policies

More AWS tools

Destructive bulk_delete_by_criteria bulk_delete_by_criteria Destructive cache_delete Delete a value from the cache. Args: key: The key to delete Returns: Destructive cache_delete_many Delete multiple values from the cache. Args: keys: List of keys to delete Destructive cache_delete_multi Delete multiple values from the cache (alias for delete_many). Args: keys: Li Destructive delete Delete a Valkey key. Args: key (str): The key to delete. Returns: Destructive delete_access_key delete_access_key Destructive delete_datastore Delete a data store from AWS HealthImaging. Destructive delete_group delete_group

All 300 AWS tools →

Read tools on other servers

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Go deeper

Roll out MCP under one policy → Per-person scoped tokens, one central policy, and full audit across every server your team connects.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →
PolicyLayer vs alternatives → How deterministic, per-call MCP policy compares with gateways, identity layers, and authorisation platforms.

FAQ

Questions about hash_get

What does the hash_get tool do? +

Get field from hash. Args: key: The name of the key field: The field name Returns: Field value or error message. It is categorised as a Read tool in the AWS MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on hash_get? +

Register the AWS MCP server in PolicyLayer and add a rule for hash_get: 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.

What risk level is hash_get? +

hash_get is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit hash_get? +

Yes. Add a rate_limit block to the hash_get 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.

How do I block hash_get completely? +

Set action: deny in the PolicyLayer policy for hash_get. 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.

What MCP server provides hash_get? +

hash_get 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.

Enforce policy on every AWS tool call.

Start from AWS, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →