refresh_schema · ProAlpha MCP Server MCP: Risk & Policy

WHAT IT DOES

What refresh_schema does on ProAlpha MCP Server

AI agents invoke refresh_schema to trigger actions in ProAlpha MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why refresh_schema needs a policy

Refreshing a schema cache is not a simple read; it actively re-scans the database and rewrites the cached schema state. This is an Execute-level operation (triggers an external operation). It is not Destructive since it doesn't irreversibly delete data, but it could have side effects like cache invalidation or locking.

From the tool's definition 'Aktualisiert den Schema-Cache' (Updates the schema cache) — triggers an active refresh/re-capture operation against the database

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

refresh_schema Rate-limited

refresh_schema stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "refresh_schema": {
      "limits": [
        {
          "counter": "refresh_schema_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about refresh_schema

What does the refresh_schema tool do? +

Aktualisiert den Schema-Cache. It is categorised as a Execute tool in the ProAlpha MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on refresh_schema? +

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

What risk level is refresh_schema? +

refresh_schema is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit refresh_schema? +

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

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

refresh_schema is provided by the ProAlpha MCP Server MCP server (ninjaede/mcp-proalpha). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.