list_insert_after

THE RISK

High Risk

Why list_insert_after needs a policy

The tool description describes inserting a value into a list after a specified pivot element, which is a write/modify operation on a data structure. However, the description is vague and inconsistent with the AWS Support API server context, lowering confidence. It could be a Redis-like list operation or an in-memory data structure manipulation.

From the tool's definition 'Insert value after pivot in list' — modifies a list data structure by inserting a value

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

POLICY

How to control list_insert_after

PolicyLayer is an MCP gateway — it sits between your AI agents and AWS Support MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_insert_after:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "list_insert_after": {
      "limits": [
        {
          "counter": "list_insert_after_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

list_insert_after stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register AWS Support 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.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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All 805 AWS Support MCP Server tools →

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Go deeper

Govern code and CI agents → Branch allowlists, approval on merges, and rate caps on the build and pipeline tools agents trigger.
High-risk tools in AWS Support MCP Server → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
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 list_insert_after

What does the list_insert_after tool do? +

Insert value after pivot in list. It is categorised as a Execute tool in the AWS Support MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on list_insert_after? +

Register the AWS Support MCP Server MCP server in PolicyLayer and add a rule for list_insert_after: 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 Support MCP Server. Nothing to install.

What risk level is list_insert_after? +

list_insert_after is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit list_insert_after? +

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

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

list_insert_after is provided by the AWS Support MCP Server MCP server (awslabs.aws-support-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 AWS Support MCP Server tool call.

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

CHECK YOUR STACK →