Prompt Security Hardening

by ed3dai

Prompt Security Hardening is an AI Engineering skill for Claude Code, published by ed3dai in ed3d-plugins.

248 stars32 forkson ed3dai/ed3d-pluginsAdded 2026/09/02Repository updated 2026/06/16

View source on GitHub Download repo ZIP

claudeclaude-codeclaude-code-pluginclaude-code-plugin-marketplaceskills

Install in seconds

Install Prompt Security Hardening

Copy Prompt Security Hardening into your Claude Code skills folder. Run the command in your terminal, or review the source on GitHub before installing.

terminal

npx degit https://github.com/ed3dai/ed3d-plugins/tree/main/plugins/ed3d-extending-claude/skills/prompt-security-hardening ~/.claude/skills/prompt-security-hardening

Requires Node.js. Downloads this skill only — not the rest of the repository — into your Claude Code skills folder.

Without Node.js

git clone https://github.com/ed3dai/ed3d-plugins.git

Clones the whole repository, then copy the skill’s own directory into your skills folder yourself.

In this catalog

Source file: plugins/ed3d-extending-claude/skills/prompt-security-hardening/SKILL.md in ed3dai/ed3d-plugins
Installs to: ~/.claude/skills/prompt-security-hardening
Collection: One of 25 skills cataloged from this repository
Category: AI Engineering — 2631 skills

What Prompt Security Hardening does

Prompt Security Hardening helps you write prompts, CLAUDE.md files, and generated code without leaking secrets or using unsafe shell patterns. Use it when handling environment variables, credentials, file permissions, or git operations.

Prompt Security Hardening is cataloged under AI Engineering on DirSkills. Prompt Security Hardening comes from a repository tagged claude, claude-code, claude-code-plugin, claude-code-plugin-marketplace and skills.

Documentation

README

Excerpt

Prompt Security Hardening

Your context window is sent to an API provider. Every secret that enters your context is a secret leaked to a third party. This skill defines the security boundaries you operate within.

1. Never Read Secret Values Into Context

When you need to verify an environment variable exists, check its existence without reading its value. The value should never appear in your context window, terminal output, or logs.

This is the opening of the README. Read the full README on GitHub.

Frequently asked about Prompt Security Hardening

What else does ed3dai publish alongside Prompt Security Hardening?
Prompt Security Hardening is one of 25 skills that DirSkills catalogs from ed3dai/ed3d-plugins, the repository it ships in. Its siblings there include Asking Clarifying Questions, Brainstorming and Coding Effectively. Each one is a separate skill with its own page in this directory, installs the same way Prompt Security Hardening does, and is maintained by ed3dai in that same repository. The rest of the collection is listed on the ed3dai/ed3d-plugins page.
How does Prompt Security Hardening compare to other AI Engineering skills?
Prompt Security Hardening ranks #2322 by stars among the 2631 AI Engineering skills in this catalog. The most-starred ones next to it are Architecture Decision Records, AI-First Engineering and Agentic OS. DirSkills ranks by the star count of the repository each skill ships in, so that order reflects how popular those repositories are rather than any review of Prompt Security Hardening against them. Open each page to compare what they document and how they install.