update_agent_runtime_endpoint

THE RISK

Medium Risk

Why update_agent_runtime_endpoint needs a policy

The tool performs a modification operation (update) on agent runtime endpoint settings. This falls into the Write category as it creates or modifies data reversibly. Severity is high because misconfigured messaging endpoints could disrupt critical communication infrastructure.

From the tool's definition Tool name 'update_agent_runtime_endpoint' indicates modification of agent configuration/state. The server is described as managing messaging services (SNS/SQS), and updating an endpoint is a reversible configuration change.

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

POLICY

How to control update_agent_runtime_endpoint

PolicyLayer is an MCP gateway — it sits between your AI agents and Awslabs Amazon Sns Sqs, and nothing reaches the server without passing your rules. This is the rule we recommend for update_agent_runtime_endpoint:

policy.json

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

update_agent_runtime_endpoint 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.

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

LIMIT THIS TOOL →

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EXPLORE

Related tools and policies

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Go deeper

Govern customer-ops agents → PII redaction, approval on external messages, and no-bulk-delete rules on the records agents change.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
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 update_agent_runtime_endpoint

What does the update_agent_runtime_endpoint tool do? +

update_agent_runtime_endpoint. It is categorised as a Write tool in the Awslabs Amazon Sns Sqs MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on update_agent_runtime_endpoint? +

Register the Awslabs Amazon Sns Sqs MCP server in PolicyLayer and add a rule for update_agent_runtime_endpoint: 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 Awslabs Amazon Sns Sqs. Nothing to install.

What risk level is update_agent_runtime_endpoint? +

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

Can I rate-limit update_agent_runtime_endpoint? +

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

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

update_agent_runtime_endpoint is provided by the Awslabs Amazon Sns Sqs MCP server (awslabs.amazon-sns-sqs-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 Awslabs Amazon Sns Sqs tool call.

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

CHECK YOUR STACK →