reconfigure_stream · S2 StreamStore MCP Server MCP

WHAT IT DOES

What reconfigure_stream does on S2 StreamStore MCP Server

AI agents use reconfigure_stream 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 reconfigure_stream needs a policy

This tool modifies existing stream configuration (storage class and retention policy). It is a Write operation as it changes settings reversibly. However, severity is high because altering retention policy (e.g., setting a very short age or switching storage class) could indirectly cause data loss or significant operational impact on data streams, even if the action itself is technically reversible.

From the tool's definition 'Reconfigure a stream' — modifies stream configuration including storage_class and retention_policy settings

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

reconfigure_stream Rate-limited

reconfigure_stream 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": {
    "reconfigure_stream": {
      "limits": [
        {
          "counter": "reconfigure_stream_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 reconfigure_stream

What does the reconfigure_stream tool do? +

Reconfigure a stream. storage_class: 'standard' or 'express'. retention_policy: {'age': seconds} or {'infinite': {}}. 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 reconfigure_stream? +

Register the S2 StreamStore MCP Server MCP server in PolicyLayer and add a rule for reconfigure_stream: 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 reconfigure_stream? +

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

Can I rate-limit reconfigure_stream? +

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

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

reconfigure_stream 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.