add-route-constraint

Add a custom route constraint to .NET Web API for validating string path parameters.

1|Updated Mar 9, 2026
One-click install
npx skills add https://github.com/Emmanuelkwaa/NetRockTemplate --skill add-route-constraint-emmanuelkwaa
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: add-route-constraint
Source: https://github.com/Emmanuelkwaa/NetRockTemplate/tree/main/.claude/skills/add-route-constraint
Command: npx skills add https://github.com/Emmanuelkwaa/NetRockTemplate --skill add-route-constraint-emmanuelkwaa

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill enhances API security and robustness by validating string path parameters directly at the routing layer, preventing invalid inputs from reaching controller logic.

Core Features & Use Cases

  • Input Validation: Ensures path parameters conform to a specified pattern and length.
  • Reduced Boilerplate: Eliminates the need for manual validation within controller actions.
  • Automatic 404 Responses: Non-matching routes are automatically rejected with a 404 status code.
  • Use Case: Protect your API endpoints by ensuring that an id parameter in a route like /items/{id:myConstraint} only accepts alphanumeric characters, periods, underscores, and hyphens, up to 100 characters.

Quick Start

Add a route constraint named 'myConstraint' that validates string path parameters against a pattern of alphanumeric characters, periods, underscores, and hyphens, with a maximum length of 100 characters.

Frequently Asked Questions about add-route-constraint

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I validate string path parameters in a .NET Web API route?

To validate string path parameters in a .NET Web API, you can apply a custom route constraint that enforces specific regex patterns and length limits directly at the routing layer, ensuring inputs conform before processing.

What is the best way to return a 404 for invalid API route parameters?

The best way to return a 404 for invalid API route parameters is to use a custom route constraint that automatically rejects non-compliant requests at the routing layer, preventing invalid inputs from ever reaching your controller logic.

How do I secure Web API endpoints by pre-validating input before it reaches the controller?

You can secure Web API endpoints by implementing a custom route constraint to pre-validate input, enforcing a specific regex pattern and length limit on string path parameters before they reach the controller logic.

Can I use a regex pattern to limit the length of a route parameter in .NET?

Yes, you can use a custom route constraint in .NET to limit the length of a route parameter and enforce a regex pattern, automatically returning a 404 status code for non-compliant requests.

Why use route constraints instead of manual validation in controller actions?

Using route constraints instead of manual validation reduces boilerplate code by automatically rejecting invalid string path parameters at the routing layer, which enhances API security and prevents invalid inputs from reaching controller actions.

Does the add-route-constraint Skill work with .NET Web API projects?

Yes, the add-route-constraint Skill works with .NET Web API projects, adding a custom route constraint to validate string path parameters against a specified pattern and length, automatically returning a 404 for non-compliant requests.