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spekka: Skill for Claude Code

.claude/skills/spekka-global-validation/SKILL.md

Global Validation is a skill for Claude Code from johnreitano/spekka. It costs 24 tokens per session (265 once invoked), scanned A, original, MIT.

A set of rules for validating application input across the server and client. Validation checks that submitted data has the right type, format, range, and required fields.

In plain words
What is it for?
Use it when designing validation for web forms, APIs, background jobs, and other entry points, including sanitizing input and checking business rules.
Why use it?
It helps prevent invalid or unsafe data from being processed and gives users useful error messages. Server-side checks protect the application even when client-side checks are bypassed.

Skill for Claude Code

Written for Claude Code: installed under .claude/. Also seen: mentions Claude Code.

This is johnreitano/spekka's own configuration. It tells Claude Code how to work on spekka itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything spekka configures →

not rated 5repo 9mo ago A scan 24 tokens original MIT
View source ↗ johnreitano/spekka
Reuse

Borrowing it

Nothing to install: this file belongs to johnreitano/spekka. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/johnreitano/spekka/main/.claude/skills/spekka-global-validation/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/johnreitano/spekka

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.

agentmods badge for Global Validation

README.md
[![agentmods](https://agentmods.dev/badge/skills/johnreitano/spekka/spekka-global-validation/github.svg)](https://agentmods.dev/skills/johnreitano/spekka/spekka-global-validation)
Your own site
<a href="https://agentmods.dev/skills/johnreitano/spekka/spekka-global-validation"><img src="https://agentmods.dev/badge/skills/johnreitano/spekka/spekka-global-validation/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.

agentmods 80×15 button for Global Validation

Your own site · 80×15
<a href="https://agentmods.dev/skills/johnreitano/spekka/spekka-global-validation"><img src="https://agentmods.dev/badge/skills/johnreitano/spekka/spekka-global-validation.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 24 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 265 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00024 $0.00265
Opus 5.5 $0.00010 $0.00106
Sonnet 5.5 $0.00005 $0.00053
Haiku 4.5 $0.00002 $0.00026

Measured 2mo ago against content hash 0e5930f737d8, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

Global Validation 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.

.claude/skills/spekka-global-validation/SKILL.md · 21 lines

What it actually says

Global Validation

This Skill provides Claude Code with specific guidance on how it should handle global validation.

Instructions

  • Validate on Server Side: Always validate on the server; never trust client-side validation alone for security or data integrity
  • Client-Side for UX: Use client-side validation to provide immediate user feedback, but duplicate checks server-side
  • Fail Early: Validate input as early as possible and reject invalid data before processing
  • Specific Error Messages: Provide clear, field-specific error messages that help users correct their input
  • Allowlists Over Blocklists: When possible, define what is allowed rather than trying to block everything that's not
  • Type and Format Validation: Check data types, formats, ranges, and required fields systematically
  • Sanitize Input: Sanitize user input to prevent injection attacks (SQL, XSS, command injection)
  • Business Rule Validation: Validate business rules (e.g., sufficient balance, valid dates) at the appropriate application layer
  • Consistent Validation: Apply validation consistently across all entry points (web forms, API endpoints, background jobs)
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.

  1. 2mo ago First seen · 21 lines · 24 tokens per session scan A 0e5930f737d8

Subscribe to this mod's changes

Global Validation is a skill published in the GitHub repository johnreitano/spekka (5 stars, last pushed 9mo ago), licensed MIT. It adds 24 tokens to every session and 265 once invoked, about $0.0001 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 2026-08-31.

Related

Global Validation compared with skills from other repositories

Global Validation next to 6 skills from other repositories
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Global Validationjohnreitano/spekkaSkill59mo agoMITA24Claude Code
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playwright-climicrosoft/playwrightSkill99kyesterdayApache-2.0A19Claude Code
local-ai-agentsmicrosoft/ai-agents-for-beginnersSkill79k4d agoMITA200Claude Code, Codex
systematic-debuggingobra/superpowersSkill313k3d agoMITA21Claude Code
next-cache-components-adoptionvercel/next.jsSkill143kyesterdayMITA95Claude Code
next-partial-prefetching-adoptionvercel/next.jsSkill143kyesterdayMITA103Claude Code