db_alter_schema · Database MCP Server MCP: Risk & Policy

WHAT IT DOES

What db_alter_schema does on Database MCP Server

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

WHY IT NEEDS A POLICY

Why db_alter_schema needs a policy

Renaming a schema modifies database metadata and structure but is reversible—the schema and its contents remain intact, just under a new name. This qualifies as Write rather than Destructive. However, depending on application logic and dependent objects, renaming could break application references or views. Medium severity reflects potential application-level disruption without data loss or permanent destruction.

From the tool's definition Tool name 'db_alter_schema' and description 'Rename a schema' indicate schema modification. This is a reversible structural change (renaming) rather than deletion.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

db_alter_schema Rate-limited

db_alter_schema 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": {
    "db_alter_schema": {
      "limits": [
        {
          "counter": "db_alter_schema_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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

FAQ

Questions about db_alter_schema

What does the db_alter_schema tool do? +

Rename a schema. It is categorised as a Write tool in the Database 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 db_alter_schema? +

Register the Database MCP Server MCP server in PolicyLayer and add a rule for db_alter_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 Database MCP Server. Nothing to install.

What risk level is db_alter_schema? +

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

Can I rate-limit db_alter_schema? +

Yes. Add a rate_limit block to the db_alter_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 db_alter_schema completely? +

Set action: deny in the PolicyLayer policy for db_alter_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 db_alter_schema? +

db_alter_schema is provided by the Database MCP Server MCP server (roilanrodriguez55/database-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.