memory_list_sessions | PolicyLayer

WHAT IT DOES

What memory_list_sessions does on Amazon Bedrock Knowledge Base Retrieval MCP Server

AI agents call memory_list_sessions to retrieve information from Amazon Bedrock Knowledge Base Retrieval MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

THE RISK

Low Risk

Why memory_list_sessions needs a policy

The tool appears to list or enumerate sessions, which is a read operation with no side effects. Even though the description is empty, the verb 'list' in the name and the context of a Bedrock Knowledge Base Retrieval server suggest this retrieves session metadata rather than modifying or executing operations. No blast radius from accidental misuse by an AI agent.

From the tool's definition Tool name 'memory_list_sessions' uses the 'list' verb, which conventionally retrieves or enumerates data without modification.

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

POLICY

How to control memory_list_sessions

PolicyLayer is an MCP gateway — it sits between your AI agents and Amazon Bedrock Knowledge Base Retrieval MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for memory_list_sessions:

policy.json

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

memory_list_sessions 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 Amazon Bedrock Knowledge Base Retrieval MCP Server — 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

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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 memory_list_sessions

What does the memory_list_sessions tool do? +

memory_list_sessions. It is categorised as a Read tool in the Amazon Bedrock Knowledge Base Retrieval MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on memory_list_sessions? +

Register the Amazon Bedrock Knowledge Base Retrieval MCP Server MCP server in PolicyLayer and add a rule for memory_list_sessions: 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 Amazon Bedrock Knowledge Base Retrieval MCP Server. Nothing to install.

What risk level is memory_list_sessions? +

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

Can I rate-limit memory_list_sessions? +

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

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

memory_list_sessions is provided by the Amazon Bedrock Knowledge Base Retrieval MCP Server MCP server (awslabs.bedrock-kb-retrieval-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Amazon Bedrock Knowledge Base Retrieval MCP Server tool call.

Start from Amazon Bedrock Knowledge Base Retrieval MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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805 Amazon Bedrock Knowledge Base Retrieval MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.