spanish phone validator

The problem

Manually verifying Spanish phone formats and carrier assignments is error-prone. Standard regex often misses the nuances of regional landlines and mobile prefixes specific to Spain.

What it does

• Validates Spanish phone number strings for correct length and format.
• Identifies the telecommunications carrier associated with the number.
• Distinguishes between regional landlines and mobile prefixes.
• Provides structured error codes for missing parameters or invalid types.
• Operates entirely offline with no external network dependencies or API keys.

Frameworks & tools

Built as an MCP tool integration. Works with any LLM client supporting Model Context Protocol (MCP) servers.

Why this beats prompting it yourself

LLMs frequently hallucinate carrier assignments based on outdated training data. This skill connects the model to a deterministic logic engine that guarantees accurate validation without the risk of creative "guessing."

Use cases

• Clean and format lead lists containing Spanish contact information.
• Automate CRM data entry by verifying numbers before saving.
• Identify carriers to optimize SMS routing or telemarketing costs.
• Provide real-time feedback in support chat interfaces.

Known limitations

This tool only supports Spanish phone numbers (+34). It does not perform live HLR lookups to check if a number is currently active on a network.