create_bucket · Yamcs MCP Server MCP: Risk & Policy

WHAT IT DOES

What create_bucket does on Yamcs MCP Server

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

WHY IT NEEDS A POLICY

Why create_bucket needs a policy

This tool creates a new storage bucket, which is a reversible write operation. It does not delete or overwrite data (not Destructive), execute arbitrary code (not Execute), or move financial resources (not Financial).

From the tool's definition Tool name 'create_bucket' and description 'Create a new storage bucket' indicate the tool creates a new data storage entity.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_bucket Rate-limited

create_bucket 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_bucket": {
      "limits": [
        {
          "counter": "create_bucket_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 Yamcs MCP Server, so you can run agents against it safely.

FAQ

Questions about create_bucket

What does the create_bucket tool do? +

Create a new storage bucket. It is categorised as a Write tool in the Yamcs 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_bucket? +

Register the Yamcs MCP Server MCP server in PolicyLayer and add a rule for create_bucket: 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 Yamcs MCP Server. Nothing to install.

What risk level is create_bucket? +

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

Can I rate-limit create_bucket? +

Yes. Add a rate_limit block to the create_bucket 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_bucket completely? +

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

create_bucket is provided by the Yamcs MCP Server MCP server (paulmramirez/yamcs-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.