create_migration

A write tool on the Supabase MCP Server - Self-Hosted Edition MCP server.

SERVERSupabase MCP Server - Self-Hosted Edition SOURCEabdqum/supabase-mcp-selfhosted

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/abdqum-supabase-mcp-selfhosted/create-migration.md

WHAT IT DOES

What create_migration does on Supabase MCP Server - Self-Hosted Edition

AI agents use create_migration to create or update resources in Supabase MCP Server - Self-Hosted Edition, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Supabase MCP Server - Self-Hosted Edition environment.

RISK

Why create_migration is rated Medium

Creating a migration generates reversible database schema change artifacts (not yet applied). This is a Write operation because it creates new configuration/code artifacts. However, given it operates on production database infrastructure and migrations can be complex, severity is elevated to 'high' rather than 'medium'.

From the tool's definition Tool name 'create_migration' on a database management server (Supabase) indicates creation of database schema changes.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs create_migration safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Supabase MCP Server - Self-Hosted Edition, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For create_migration, this is the rule to start with:

create_migration Rate-limited

create_migration 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_migration": {
      "limits": [
        {
          "counter": "create_migration_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Supabase MCP Server - Self-Hosted Edition, apply this rule, and every create_migration call is checked against it from then on.

FAQ

Questions about create_migration

What does the create_migration tool do? +

create_migration is a write tool on the Supabase MCP Server - Self-Hosted Edition MCP server. It is categorised as a Write tool in the Supabase MCP Server - Self-Hosted Edition 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_migration? +

Register the Supabase MCP Server - Self-Hosted Edition MCP server in PolicyLayer and add a rule for create_migration: 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 Supabase MCP Server - Self-Hosted Edition. Nothing to install.

What risk level is create_migration? +

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

Can I rate-limit create_migration? +

Yes. Add a rate_limit block to the create_migration 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_migration completely? +

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

create_migration is provided by the Supabase MCP Server - Self-Hosted Edition MCP server (abdqum/supabase-mcp-selfhosted). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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