string_increment

THE RISK

High Risk

Why string_increment needs a policy

The tool description is extremely sparse, making classification uncertain. 'Increment integer value' could imply modifying a stored counter or configuration value (Write), or it could be a pure in-memory arithmetic utility (Other/Read). Given the context of an EKS MCP server where such an operation likely affects some system state or counter, Execute/Write seems plausible.

From the tool's definition 'Increment integer value' - the description is minimal and uninformative about what data or system state is being modified

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

POLICY

How to control string_increment

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

policy.json

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

string_increment 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 Amazon EKS 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 Amazon EKS 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 Amazon EKS 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 string_increment

What does the string_increment tool do? +

Increment integer value. It is categorised as a Execute tool in the Amazon EKS 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 string_increment? +

Register the Amazon EKS MCP Server MCP server in PolicyLayer and add a rule for string_increment: 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 EKS MCP Server. Nothing to install.

What risk level is string_increment? +

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

Can I rate-limit string_increment? +

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

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

string_increment is provided by the Amazon EKS MCP Server MCP server (awslabs.eks-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 EKS MCP Server tool call.

Start from Amazon EKS 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 →