xano_add_field_to_schema · Xano MCP Server MCP

WHAT IT DOES

What xano_add_field_to_schema does on Xano MCP Server

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

WHY IT NEEDS A POLICY

Why xano_add_field_to_schema needs a policy

Adding a field to a schema modifies the database structure irreversibly in terms of application logic, though the operation itself is technically reversible (the field can be removed). This is Write rather than Destructive because it does not delete data. High severity because schema changes can break applications or cause data integrity issues if misused by an agent.

From the tool's definition Tool name 'xano_add_field_to_schema' indicates it adds/modifies a database schema. Description is empty, but the name strongly suggests structural modification of a table or database definition.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

xano_add_field_to_schema Rate-limited

xano_add_field_to_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": {
    "xano_add_field_to_schema": {
      "limits": [
        {
          "counter": "xano_add_field_to_schema_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 Xano MCP Server, so you can run agents against it safely.

FAQ

Questions about xano_add_field_to_schema

What does the xano_add_field_to_schema tool do? +

xano_add_field_to_schema. It is categorised as a Write tool in the Xano 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 xano_add_field_to_schema? +

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

What risk level is xano_add_field_to_schema? +

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

Can I rate-limit xano_add_field_to_schema? +

Yes. Add a rate_limit block to the xano_add_field_to_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 xano_add_field_to_schema completely? +

Set action: deny in the PolicyLayer policy for xano_add_field_to_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 xano_add_field_to_schema? +

xano_add_field_to_schema is provided by the Xano MCP Server MCP server (roboulos/simple-xano-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.