retrieve_from_aws_kb

THE RISK

Low Risk

Why retrieve_from_aws_kb needs a policy

This tool queries a knowledge base and returns information without modifying, deleting, or executing code. It is a straightforward retrieval operation with no side effects, fitting the Read category. The severity is low because unauthorized retrieval of knowledge base content typically poses minimal immediate risk compared to write or destructive operations, though sensitivity of retrieved data could vary.

From the tool's definition Tool name and description indicate 'retrieval' operation: 'Performs retrieval from the AWS Knowledge Base using the provided query and Knowledge Base ID.' The verb 'retrieval' and absence of any modification, deletion, or execution language confirm read-only…

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

POLICY

How to control retrieve_from_aws_kb

PolicyLayer is an MCP gateway — it sits between your AI agents and MCP-Brave-Search, and nothing reaches the server without passing your rules. This is the rule we recommend for retrieve_from_aws_kb:

policy.json

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

retrieve_from_aws_kb 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 MCP-Brave-Search — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

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Go deeper

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.
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FAQ

Questions about retrieve_from_aws_kb

What does the retrieve_from_aws_kb tool do? +

Performs retrieval from the AWS Knowledge Base using the provided query and Knowledge Base ID. It is categorised as a Read tool in the MCP-Brave-Search MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on retrieve_from_aws_kb? +

Register the MCP-Brave-Search MCP server in PolicyLayer and add a rule for retrieve_from_aws_kb: 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 MCP-Brave-Search. Nothing to install.

What risk level is retrieve_from_aws_kb? +

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

Can I rate-limit retrieve_from_aws_kb? +

Yes. Add a rate_limit block to the retrieve_from_aws_kb 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 retrieve_from_aws_kb completely? +

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

retrieve_from_aws_kb is provided by the MCP-Brave-Search MCP server (modelcontextprotocol/servers-archived). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCP-Brave-Search tool call.

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

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