validate_vat
Validate a VAT number format for EU countries. Parameters: vat — VAT number to validate.
This record as markdown: /tools/com-gadgethumans-swarm-x402-middleware/validate-vat.md
What validate_vat does on X402 Middleware
AI agents call validate_vat to retrieve information from X402 Middleware without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
vat | string | Yes |
Parameters from the server's own tool schema.
Why validate_vat is rated Low
This tool performs read-only validation of VAT number formats. It queries or checks data (the VAT number provided) against validation rules, returns a true/false or status result, and has no capability to modify, create, delete, or execute external operations. No financial transactions are initiated by validation alone.
From the tool's definition Tool name 'validate_vat' and description 'Validate a VAT number format for EU countries' indicate a validation/verification operation with no side effects. The tool only checks format compliance against known patterns.
Attacks that exploit this kind of access
The rule that runs validate_vat safely
PolicyLayer is an MCP gateway: it sits between your AI agents and X402 Middleware, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For validate_vat, this is the rule to start with:
validate_vat is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect X402 Middleware, apply this rule, and every validate_vat call is checked against it from then on.
Questions about validate_vat
Validate a VAT number format for EU countries. Parameters: vat — VAT number to validate. It is categorised as a Read tool in the X402 Middleware MCP Server, which means it retrieves data without modifying state.
validate_vat accepts 1 parameter: vat. Required: vat. The full parameter table on this page comes from the server's own tool schema.
Register the X402 Middleware MCP server in PolicyLayer and add a rule for validate_vat: 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 X402 Middleware. Nothing to install.
validate_vat is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the validate_vat 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.
Set action: deny in the PolicyLayer policy for validate_vat. 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.
validate_vat is provided by the X402 Middleware MCP server (@gadgethumans/x402). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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