setup_credentials · Yandex Cloud MCP Server MCP

WHAT IT DOES

What setup_credentials does on Yandex Cloud MCP Server

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

WHY IT NEEDS A POLICY

Why setup_credentials needs a policy

Setting up credentials is a reversible write operation that modifies session state by establishing authentication. While not immediately destructive, it enables subsequent operations and represents a configuration change. Severity is high because compromised credential setup could lead to unauthorized access or resource misuse, though the action itself is reversible.

From the tool's definition Tool description states 'Setup Yandex Cloud credentials for the session' — this creates or modifies credentials for the current session, which is a write operation that alters state.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

setup_credentials Rate-limited

setup_credentials 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": {
    "setup_credentials": {
      "limits": [
        {
          "counter": "setup_credentials_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 Yandex Cloud MCP Server, so you can run agents against it safely.

FAQ

Questions about setup_credentials

What does the setup_credentials tool do? +

Setup Yandex Cloud credentials for the session. It is categorised as a Write tool in the Yandex Cloud 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 setup_credentials? +

Register the Yandex Cloud MCP Server MCP server in PolicyLayer and add a rule for setup_credentials: 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 Yandex Cloud MCP Server. Nothing to install.

What risk level is setup_credentials? +

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

Can I rate-limit setup_credentials? +

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

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

setup_credentials is provided by the Yandex Cloud MCP Server MCP server (romati88/ycmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.