encrypt-api-keys

encrypt-api-keys is a skill for Claude Code from JNZader/repoforge. It costs 32 tokens per session (450 once invoked), scanned A, original, MIT.

Instructions for encrypting provider API keys, which are secret credentials used to access external services, with AES-256-GCM, an authenticated encryption method. It also describes deriving a user-specific encryption key.

In plain words
What is it for?
Use it to derive a user key and encrypt provider API keys or other sensitive values before storage or transmission.
Why use it?
It helps keep API keys protected when they are stored or sent, while associating encryption with a particular user.

Skill for Claude Code

Written for Claude Code: installed under .claude/.

Not installable on its own: it runs a file from its repository that does not travel with it. Clone the repository, or install whatever ships that file. The line is docker-compose run app python apps/server/app/main.py.

Install

Getting it into your agent

There is no command for this one: it runs only inside a plugin, and the catalogue could not identify which plugin ships it. The source is linked below.

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 encrypt-api-keys

README.md
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Per session 32 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 450 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00032 $0.00450
Opus 5 $0.00016 $0.00225
Sonnet 5 $0.00006 $0.00090
Haiku 4.5 $0.00003 $0.00045

Measured 6d ago against content hash b95d729062bb, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

encrypt-api-keys 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 6d 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/backend/crypto/SKILL.md · 82 lines

What it actually says

encrypt-api-keys

This skill covers AES-256-GCM encryption for provider API keys.

Trigger: Load this skill when handling crypto operations for API keys.

Quick Reference

Task Pattern
Derive user key derive_user_key
Encrypt API key encrypt_key

Critical Patterns (Summary)

  • Derive User Key: Generate a secure key for user-specific encryption.
  • Encrypt API Key: Securely encrypt an API key using AES-256-GCM.

Critical Patterns (Detailed)

Derive User Key

Generate a secure key for user-specific encryption using the derive_user_key function.

from apps.server.app.services.crypto import derive_user_key

user_key = derive_user_key(user_id="example_user")

Encrypt API Key

Securely encrypt an API key using AES-256-GCM with the encrypt_key function.

from apps.server.app.services.crypto import encrypt_key

encrypted_key = encrypt_key(api_key="my_secret_api_key", user_key=user_key)

When to Use

  • When you need to securely store API keys for different providers.
  • When encrypting sensitive information before transmission.

Commands

docker-compose run app python apps/server/app/main.py

Anti-Patterns

Don't: Hardcode API Keys

Hardcoding API keys in the source code exposes them to security risks.

# BAD
api_key = "my_secret_api_key"
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. 6d ago First seen · 82 lines · 32 tokens per session scan A b95d729062bb

Subscribe to this mod's changes

encrypt-api-keys is a skill published in the GitHub repository JNZader/repoforge (5 stars, last pushed 11d ago), licensed MIT. It adds 32 tokens to every session and 450 once invoked, about $0.0002 per session on Opus 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.