create_serverless_session · Session Buddy MCP: Risk & Policy

WHAT IT DOES

What create_serverless_session does on Session Buddy

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

WHY IT NEEDS A POLICY

Why create_serverless_session needs a policy

This tool creates (writes) a new session object in external storage, which is a reversible modification. It does not execute arbitrary code, delete data, or move money. The severity is medium because misconfiguration or abuse could create many sessions consuming resources or exposing unintended storage access, but the operation itself is not inherently destructive or critically dangerous.

From the tool's definition Tool name 'create_serverless_session' and description 'Create a new serverless session with external storage' indicate a create/initialization operation that modifies state by establishing a new session resource.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_serverless_session Rate-limited

create_serverless_session 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_serverless_session": {
      "limits": [
        {
          "counter": "create_serverless_session_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 Session Buddy, so you can run agents against it safely.

FAQ

Questions about create_serverless_session

What does the create_serverless_session tool do? +

Create a new serverless session with external storage. It is categorised as a Write tool in the Session Buddy 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_serverless_session? +

Register the Session Buddy MCP server in PolicyLayer and add a rule for create_serverless_session: 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 Session Buddy. Nothing to install.

What risk level is create_serverless_session? +

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

Can I rate-limit create_serverless_session? +

Yes. Add a rate_limit block to the create_serverless_session 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_serverless_session completely? +

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

create_serverless_session is provided by the Session Buddy MCP server (lesleslie/session-buddy). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.