schema_validate_migration

Check a migration file for common safety issues before running it (Pro feature)

SERVERPlugin Hub SOURCE@barnburner121/plugin-hub-mcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/barnburner121-plugin-hub-mcp/schema-validate-migration.md

WHAT IT DOES

What schema_validate_migration does on Plugin Hub

AI agents call schema_validate_migration to retrieve information from Plugin Hub without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why schema_validate_migration is rated Low

Even though schema_validate_migration only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs schema_validate_migration safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Plugin Hub, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For schema_validate_migration, this is the rule to start with:

schema_validate_migration Allowed

schema_validate_migration is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "schema_validate_migration": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Plugin Hub, apply this rule, and every schema_validate_migration call is checked against it from then on.

FAQ

Questions about schema_validate_migration

What does the schema_validate_migration tool do? +

Check a migration file for common safety issues before running it (Pro feature). It is categorised as a Read tool in the Plugin Hub MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on schema_validate_migration? +

Register the Plugin Hub MCP server in PolicyLayer and add a rule for schema_validate_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 Plugin Hub. Nothing to install.

What risk level is schema_validate_migration? +

schema_validate_migration is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit schema_validate_migration? +

Yes. Add a rate_limit block to the schema_validate_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 schema_validate_migration completely? +

Set action: deny in the PolicyLayer policy for schema_validate_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 schema_validate_migration? +

schema_validate_migration is provided by the Plugin Hub MCP server (@barnburner121/plugin-hub-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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