Validates Spanish tax identification numbers — NIF (DNI, 8 digits + check letter, for Spanish citizens), NIE (Número de Identidad de Extranjero, starts with X/Y/Z, for foreign residents), and CIF (Código de Identificación Fiscal, letter + 7 digits + control, for companies). Automatically detects ...
AI agents call validate_nif_es to retrieve information from Mcp Europe Business without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and validates existing identifiers against regulatory format rules without side effects. The validation logic is deterministic and read-only: it checks input against known formats and checksums but does not create, modify, delete, or execute external operations. It returns pass/fail results only. This is characteristic of Read category tools (validate, check, verify patterns).
From the tool's definition Tool performs validation only: 'Validates Spanish tax identification numbers', 'Automatically detects the document type', 'Applies the official check letter algorithm'.
Attacks that exploit this kind of access
Validates Spanish tax identification numbers — NIF (DNI, 8 digits + check letter, for Spanish citizens), NIE (Número de Identidad de Extranjero, starts with X/Y/Z, for foreign residents), and CIF (Código de Identificación Fiscal, letter + 7 digits + control, for companies). Automatically detects the document type. Applies the official check letter algorithm based on the modulo-23 lookup table. It is categorised as a Read tool in the Mcp Europe Business MCP Server, which means it retrieves data without modifying state.
Register the Mcp Europe Business MCP server in PolicyLayer and add a rule for validate_nif_es: 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 Mcp Europe Business. Nothing to install.
validate_nif_es 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_nif_es 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_nif_es. 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_nif_es is provided by the Mcp Europe Business MCP server (josemvelez78/mcp-europe-business). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
Teams ship this data inside their own products. See what a licence covers →