create_basin · S2 StreamStore MCP Server MCP: Risk & Policy

WHAT IT DOES

What create_basin does on S2 StreamStore MCP Server

AI agents use create_basin to create or update resources in S2 StreamStore MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your S2 StreamStore MCP Server environment.

WHY IT NEEDS A POLICY

Why create_basin needs a policy

This tool creates a new basin resource, which is a reversible operation (basins can be deleted via delete_basin). It does not execute arbitrary code, delete data irreversibly, or involve financial transactions. The medium severity reflects that creating basins could consume storage resources or affect account infrastructure, but the impact is bounded and reversible.

From the tool's definition Tool name 'create_basin' and description 'Create a new basin' indicate data creation. The tool establishes a new persistent resource (a basin) in the StreamStore infrastructure.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_basin Rate-limited

create_basin 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.

View as policy code

policy.json

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

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches S2 StreamStore MCP Server, so you can run agents against it safely.

FAQ

Questions about create_basin

What does the create_basin tool do? +

Create a new basin. Name must be globally unique, 8-48 chars, lowercase alphanumeric and hyphens. It is categorised as a Write tool in the S2 StreamStore MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_basin? +

Register the S2 StreamStore MCP Server MCP server in PolicyLayer and add a rule for create_basin: 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 S2 StreamStore MCP Server. Nothing to install.

What risk level is create_basin? +

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

Can I rate-limit create_basin? +

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

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

create_basin is provided by the S2 StreamStore MCP Server MCP server (s2-streamstore/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.