What is input-validation-checker?

A security checker for validating data supplied by users or other systems before an application processes it.

Use it to review input-validation patterns and generate or check related configurations.

It helps reduce errors and security risks caused by unexpected or unsafe input.

input-validation-checker — Skill for Claude Code by DamingDong

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add DamingDong/opencode-skills-hub --skill input-validation-checker

Clone the repo

git clone --depth 1 https://github.com/DamingDong/opencode-skills-hub

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/damingdong/opencode-skills-hub/input-validation-checker/github.svg)](https://agentmods.dev/skills/damingdong/opencode-skills-hub/input-validation-checker)

Your own site

<a href="https://agentmods.dev/skills/damingdong/opencode-skills-hub/input-validation-checker"><img src="https://agentmods.dev/badge/skills/damingdong/opencode-skills-hub/input-validation-checker/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/damingdong/opencode-skills-hub/input-validation-checker"><img src="https://agentmods.dev/badge/skills/damingdong/opencode-skills-hub/input-validation-checker.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 64 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 432 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00064	$0.00432
Opus 5.5	$0.00026	$0.00173
Sonnet 5.5	$0.00013	$0.00086
Haiku 4.5	$0.00006	$0.00043

Measured 2mo ago against content hash b57473a2c0c7, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

input-validation-checker scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/community/input-validation-checker/SKILL.md · 73 lines

What it actually says

Input Validation Checker

Overview

This skill provides automated assistance for input validation checker tasks within the Security Fundamentals domain.

When to Use

This skill activates automatically when you:

Mention "input validation checker" in your request
Ask about input validation checker patterns or best practices
Need help with essential security skills covering authentication, input validation, secure coding practices, and basic vulnerability detection.

Instructions

Provides step-by-step guidance for input validation checker
Follows industry best practices and patterns
Generates production-ready code and configurations
Validates outputs against common standards

Examples

Example: Basic Usage Request: "Help me with input validation checker" Result: Provides step-by-step guidance and generates appropriate configurations

Prerequisites

Relevant development environment configured
Access to necessary tools and services
Basic understanding of security fundamentals concepts

Output

Generated configurations and code
Best practice recommendations
Validation results

Error Handling

Error	Cause	Solution
Configuration invalid	Missing required fields	Check documentation for required parameters
Tool not found	Dependency not installed	Install required tools per prerequisites
Permission denied	Insufficient access	Verify credentials and permissions

Resources

Official documentation for related tools
Best practices guides
Community examples and tutorials

Part of the Security Fundamentals skill category. Tags: security, authentication, validation, owasp, secure-coding

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 73 lines · 64 tokens per session scan A b57473a2c0c7

Subscribe to this mod's changes

input-validation-checker is a skill published in the GitHub repository DamingDong/opencode-skills-hub (12 stars, last pushed 9mo ago), licensed MIT. It adds 64 tokens to every session and 432 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.