auto-edge-cases

Identify and fix boundary-related vulnerabilities in code that accepts external input.

6|Updated Mar 31, 2026
One-click install
npx skills add https://github.com/Corvalis-LLC/Crow-Stack --skill auto-edge-cases
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: auto-edge-cases
Source: https://github.com/Corvalis-LLC/Crow-Stack/tree/main/skills/auto-edge-cases
Command: npx skills add https://github.com/Corvalis-LLC/Crow-Stack --skill auto-edge-cases

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Edge-case and boundary handling discipline helps developers identify and guard against common input-related failures that break production software, such as empty collections, zero/negative inputs, off-by-one errors, and Unicode handling pitfalls. It emphasizes turning happy-path code into robust, boundary-aware implementations.

Core Features & Use Cases

  • Boundary-focused guardrails: check inputs, saturating math for indices, and safe slicing to prevent panics.
  • Anti-patterns to avoid: missing input guards, division by zero, silent NaN propagation, and unsafe indexing.
  • Use Case: when writing functions that accept external input, collections, numeric ranges, or string processing, apply this discipline to ensure predictable behavior under edge cases.

Quick Start

Analyze your function's inputs for empty, zero, and boundary conditions and add guard checks before performing any processing.

Frequently Asked Questions about auto-edge-cases

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

FAQPage Schema
How do I add input validation to prevent boundary bugs in my code?

Input validation prevents boundary bugs by adding guard clauses at public boundaries to check for empty collections, zero, and negative inputs before processing. This ensures robust code by stopping invalid data from triggering downstream failures like unsafe indexing.

What is the best way to handle empty collections and off-by-one errors when processing external input?

Handling empty collections and off-by-one errors requires edge-case discipline, applying saturating arithmetic for indices and safe slicing. This approach catches boundary conditions early, preventing panics and ensuring predictable behavior when functions process external input.

Does defensive programming help with division by zero and silent NaN propagation?

Defensive programming helps avoid division by zero and silent NaN propagation by enforcing anti-pattern checks. Applying boundary-focused guardrails at function entry points stops these mathematical edge cases from corrupting calculations and breaking data processing workflows.

Can I apply edge-case discipline across common programming languages and data processing contexts?

You can apply edge-case discipline across common languages and data processing contexts because it focuses on universal boundary logic. It implements robust guard clauses and safe indexing techniques that adapt to any environment accepting external input.

Why does my code panic when performing unsafe indexing on boundary inputs?

Code panics on boundary inputs because missing input guards allow unsafe indexing of empty or out-of-bounds collections. Implementing saturating arithmetic and safe slicing prevents these panics by ensuring index values stay within valid limits.

When do I need to add guard clauses for robust code?

You need guard clauses for robust code whenever writing functions that accept external input, collections, numeric ranges, or string processing. Adding these checks at public boundaries ensures edge-case discipline is enforced before any processing begins.