hash_set_multiple

Set multiple fields in hash. Args: key: The name of the key mapping: Dictionary of field-value pairs Returns: Success message or error message

SERVERAWS SOURCE@awslabs/mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity verified Pull the record →

This record as markdown: /tools/aws/hash-set-multiple.md

WHAT IT DOES

What hash_set_multiple does on AWS

AI agents use hash_set_multiple to create or update resources in AWS, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your AWS environment.

RISK

Why hash_set_multiple is rated Medium

This tool creates or modifies data in a hash/dictionary structure in what appears to be a caching or state management system (likely Redis or similar). The operation is reversible—fields can be updated or deleted later. It does not delete data irreversibly, execute arbitrary code, or move money, so it is categorized as Write.

From the tool's definition Tool name 'hash_set_multiple' and description 'Set multiple fields in hash' indicate modification of data. The arguments accept a key and a mapping of field-value pairs to be written/updated in a hash structure.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs hash_set_multiple 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_set_multiple, this is the rule to start with:

hash_set_multiple Rate-limited

hash_set_multiple stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "hash_set_multiple": {
      "limits": [
        {
          "counter": "hash_set_multiple_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect AWS, apply this rule, and every hash_set_multiple call is checked against it from then on.

FAQ

Questions about hash_set_multiple

What does the hash_set_multiple tool do? +

Set multiple fields in hash. Args: key: The name of the key mapping: Dictionary of field-value pairs Returns: Success message or error message. It is categorised as a Write tool in the AWS MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on hash_set_multiple? +

Register the AWS MCP server in PolicyLayer and add a rule for hash_set_multiple: 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_set_multiple? +

hash_set_multiple is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit hash_set_multiple? +

Yes. Add a rate_limit block to the hash_set_multiple 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_set_multiple completely? +

Set action: deny in the PolicyLayer policy for hash_set_multiple. 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_set_multiple? +

hash_set_multiple 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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