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Agent skill

Scanning Input Validation Practices

by jeremylongshore in jeremylongshore/tons-of-skills-marketplace

Scan for input validation vulnerabilities and injection risks.

MITAuto-check passedSecurity

Install Scanning Input Validation Practices

skills CLI
$ npx skills add jeremylongshore/tons-of-skills-marketplace --skill scanning-input-validation-practices -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install jeremylongshore/tons-of-skills-marketplace scanning-input-validation-practices --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/jeremylongshore/tons-of-skills-marketplace.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/.curated/scanning-input-validation-practices .claude/skills/scanning-input-validation-practices && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
scanning-input-validation-practices
GitHub stars
2.8k
Token cost
~1.1k tokens
SKILL.md length
511 words
Files
9 (incl. scripts, references, assets)
Skills in repo
3,342
Repo updated
First seen
Licence
MIT

At a glance

Scan for input validation vulnerabilities and injection risks.

  • Works in 4 steps: Initiate Scan: The user requests an… → Code Analysis: The skill uses the… → Vulnerability Identification: The plugin… → …
  • Reviewing user input handling
  • SKILL.md covers Overview, How It Works, When to Use This Skill and Examples, plus 7 more sections
  • Runs Python scripts from its folder

What it does

Scanning Input Validation Practices is an agent skill from jeremylongshore/tons-of-skills-marketplace. Scan for input validation vulnerabilities and injection risks. Use when reviewing user input handling. Trigger with 'scan input validation', 'check injection vulnerabilities', or 'validate sanitization'.

Its SKILL.md is about 1.1k tokens, which your agent loads only when the skill is triggered. The skill folder holds 11 other files, including scripts, reference files and assets (for example `assets/README.md`, `assets/semgrep_ruleset.yaml` and `assets/vulnerable-code-examples.md`). Compatibility notes: Designed for Claude Code

It sits in Security, covering Web application vulnerabilities. The repository describes itself as: Model-agnostic agent-skills platform with a harness-free canonical layer, verified adapters, and the ccpi package manager. Explore at tonsofskills.com. The licence is MIT.

When your agent uses it

  • Reviewing user input handling
  • With scan input validation
  • Check injection vulnerabilities
  • Validate sanitization

Example prompts

  • “scan input validation”
  • “check injection vulnerabilities”
  • “validate sanitization”
  • “/scanning-input-validation-practices”

Requirements

  • Python 3
  • Compatibility (from SKILL.md): Designed for Claude Code
  • Pre-approved tools (allowed-tools): Read, Write, Edit, Grep, Glob, Bash(security:*), Bash(scan:*), Bash(audit:*)

Workflow steps

4 steps, taken from the first numbered list in SKILL.md.

  1. Initiate Scan: The user requests an input validation scan, triggering the skill.
  2. Code Analysis: The skill uses the input-validation-scanner plugin to analyze the specified codebase or file.
  3. Vulnerability Identification: The plugin identifies instances where input validation may be missing or insufficient.
  4. Report Generation: The skill presents a report highlighting potential vulnerabilities and their locations in the code.

What it can do on your machine

Read from SKILL.md and the folder at commit cfae287. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves these tools, so the agent can use them without asking each time:

    • Read
    • Write
    • Edit
    • Grep
    • Glob
    • Bash(security:*)
    • Bash(scan:*)
    • Bash(audit:*)

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Ships 3 files in scripts/ (Python), which the agent can run.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

  • Compatibility

    Designed for Claude Code

    From compatibility in the SKILL.md frontmatter.

Context cost

Scanning Input Validation Practices loads about 1.1k tokens when it runs, and up to ~1.1k if it reads all its reference files. Until then it costs about 60 tokens; SKILL.md has 511 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~60
When it runs · the whole SKILL.md, loaded when a task matches
~1.1k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~1.1k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.

SKILL.md

The full file from jeremylongshore/tons-of-skills-marketplace at commit cfae287, republished under its MIT licence (© jeremylongshore). 511 words, ~1,121 tokens.

Download SKILL.mdSave it as .claude/skills/scanning-input-validation-practices/SKILL.md (or your agent's skills folder). This skill also uses 8 other files; get the full folder from GitHub.
name
scanning-input-validation-practices
description
Scan for input validation vulnerabilities and injection risks. Use when reviewing user input handling. Trigger with 'scan input validation', 'check injection vulnerabilities', or 'validate sanitization'.
allowed-tools
Read, Write, Edit, Grep, Glob, Bash(security:*), Bash(scan:*), Bash(audit:*)
compatibility
Designed for Claude Code
version
1.25.0
license
MIT
author
Jeremy Longshore <jeremy@intentsolutions.io>
tags
security, scanning-input

Input Validation Scanner

Overview

Scan application source code for missing or insufficient input validation that could lead to injection attacks (SQL, XSS, command injection), buffer overflows, and path traversal vulnerabilities. Analyzes how user-provided data flows from HTTP parameters, form fields, and API inputs through the application to identify locations where sanitization or validation is absent.

How It Works

  1. Initiate Scan: The user requests an input validation scan, triggering the skill.
  2. Code Analysis: The skill uses the input-validation-scanner plugin to analyze the specified codebase or file.
  3. Vulnerability Identification: The plugin identifies instances where input validation may be missing or insufficient.
  4. Report Generation: The skill presents a report highlighting potential vulnerabilities and their locations in the code.

When to Use This Skill

This skill activates when you need to:

  • Audit a codebase for input validation vulnerabilities.
  • Review newly written code for potential XSS or SQL injection flaws.
  • Harden an application against common web security exploits.
  • Ensure compliance with security best practices related to input handling.

Examples

Example 1: Identifying XSS Vulnerabilities

User request: "Scan the user profile module for potential XSS vulnerabilities."

The skill will:

  1. Activate the input-validation-scanner plugin on the specified module.
  2. Generate a report highlighting areas where user input is directly rendered without proper sanitization, indicating potential XSS vulnerabilities.
Example 2: Checking for SQL Injection Risks

User request: "Check the database access layer for potential SQL injection risks."

The skill will:

  1. Use the input-validation-scanner plugin to examine the database access code.
  2. Identify instances where user input is used directly in SQL queries without proper parameterization or escaping, indicating potential SQL injection vulnerabilities.

Best Practices

  • Regular Scanning: Integrate input validation scanning into your regular development workflow.
  • Contextual Analysis: Always review the identified vulnerabilities in context to determine their actual impact and severity.
  • Comprehensive Validation: Ensure that all user-supplied data is validated, including data from forms, APIs, and external sources.
Show full SKILL.md (195 more words)Show less

Integration

This skill can be used in conjunction with other security-related skills to provide a more comprehensive security assessment. For example, it can be combined with a static analysis skill to identify other types of vulnerabilities or with a dependency scanning skill to identify vulnerable third-party libraries.

Prerequisites

  • Access to codebase and configuration files in ${CLAUDE_SKILL_DIR}/
  • Security scanning tools installed as needed
  • Understanding of security standards and best practices
  • Permissions for security analysis operations

Instructions

  1. Identify security scan scope and targets
  2. Configure scanning parameters and thresholds
  3. Execute security analysis systematically
  4. Analyze findings for vulnerabilities and compliance gaps
  5. Prioritize issues by severity and impact
  6. Generate detailed security report with remediation steps

Output

  • Security scan results with vulnerability details
  • Compliance status reports by standard
  • Prioritized list of security issues by severity
  • Remediation recommendations with code examples
  • Executive summary for stakeholders

Error Handling

If security scanning fails:

  • Verify tool installation and configuration
  • Check file and directory permissions
  • Validate scan target paths
  • Review tool-specific error messages
  • Ensure network access for dependency checks

Resources

  • Security standard documentation (OWASP, CWE, CVE)
  • Compliance framework guidelines (GDPR, HIPAA, PCI-DSS)
  • Security scanning tool documentation
  • Vulnerability remediation best practices

© jeremylongshore, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 8 other files (scripts, references, assets) in skills/.curated/scanning-input-validation-practices of jeremylongshore/tons-of-skills-marketplace.

  • SKILL.md
  • assets/README.md
  • assets/codeql_ruleset.qls
  • assets/semgrep_ruleset.yaml
  • assets/vulnerable-code-examples.md
  • references/README.md
  • scripts/README.md
  • scripts/codeql_scan.py
  • scripts/semgrep_scan.py

Open the folder on GitHubat commit cfae287

Compare with similar skills

Scanning Input Validation Practices next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Scanning Input Validation Practices compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Scanning Input Validation Practices this skilljeremylongshore/tons-of-skills-marketplace2.8k—~1.1kAutomated safety check: PassMIT
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Security Auditoreigent-ai/eigent15k—~1.8kAutomated safety check: NotesApache-2.0
Security Reviewjewbetcha/opentrace11618 repos~3.1kAutomated safety check: NotesMIT
Strix Code Vulnerability Scanusestrix/strix68k—~1.1kAutomated safety check: PassApache-2.0
Code Audit3stoneBrother/code-audit8921 repos~2.7kAutomated safety check: PassNone

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Categories

Questions about Scanning Input Validation Practices

What does Scanning Input Validation Practices do?

Scan for input validation vulnerabilities and injection risks. Scanning Input Validation Practices is an agent skill from jeremylongshore/tons-of-skills-marketplace. Scan for input validation vulnerabilities and injection risks.

When should I use Scanning Input Validation Practices?

Scanning Input Validation Practices fits situations like: reviewing user input handling; with scan input validation; check injection vulnerabilities; validate sanitization.

How do I install Scanning Input Validation Practices in Claude Code?

Run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill scanning-input-validation-practices -a claude-code`. Or copy the skill folder (skills/.curated/scanning-input-validation-practices in jeremylongshore/tons-of-skills-marketplace) into .claude/skills/scanning-input-validation-practices in your project. Claude Code loads it when a task matches its description.

How do I install Scanning Input Validation Practices in Codex?

Run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill scanning-input-validation-practices -a codex`. Or copy the skill folder (skills/.curated/scanning-input-validation-practices in jeremylongshore/tons-of-skills-marketplace) into .agents/skills/scanning-input-validation-practices in your project. Codex loads it when a task matches its description.

Can I use Scanning Input Validation Practices in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill scanning-input-validation-practices -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/scanning-input-validation-practices, .gemini/skills/scanning-input-validation-practices, .github/skills/scanning-input-validation-practices and .opencode/skills/scanning-input-validation-practices in your project.

What does Scanning Input Validation Practices need to run?

Going by SKILL.md and its folder, Scanning Input Validation Practices needs Python for the scripts in its folder. Our summary lists: Python 3. Its frontmatter pre-approves these tools: Read, Write, Edit, Grep, Glob, Bash(security:*), Bash(scan:*), Bash(audit:*). Compatibility (from SKILL.md): Designed for Claude Code.

Does Scanning Input Validation Practices access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Scanning Input Validation Practices safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.

What licence does Scanning Input Validation Practices use?

Scanning Input Validation Practices is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Scanning Input Validation Practices use?

About 1.1k tokens (SKILL.md is roughly 4.5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 17 tokens, read only when the agent opens those files.

What are the alternatives to Scanning Input Validation Practices?

Skills that share tags, products or a category with Scanning Input Validation Practices: Security And Hardening (penpot/penpot, 61k stars), Security Auditor (eigent-ai/eigent, 15k stars), Security Review (jewbetcha/opentrace, 116 stars) and Strix Code Vulnerability Scan (usestrix/strix, 68k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Scanning Input Validation Practices?

jeremylongshore (a GitHub user) maintains it in jeremylongshore/tons-of-skills-marketplace, which has 2,827 GitHub stars. The repository holds 3,342 skills in this directory. The repository was last updated on October 10, 2026.

Source: jeremylongshore/tons-of-skills-marketplace on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.