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Agent skill

API Credentials

by oaustegard in oaustegard/claude-skills

Securely manages API credentials for multiple providers (Anthropic Claude, Google Gemini, GitHub).

MITAuto-check passedAI & LLM Engineering

Install API Credentials

skills CLI
$ npx skills add oaustegard/claude-skills --skill api-credentials -a claude-code

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

GitHub CLI
$ gh skill install oaustegard/claude-skills api-credentials --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/oaustegard/claude-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/api-credentials .claude/skills/api-credentials && 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
api-credentials
GitHub stars
150
Token cost
~1.4k tokens
SKILL.md length
456 words
Files
5 (incl. scripts, assets)
Skills in repo
93
Repo updated
First seen
Licence
MIT

At a glance

Securely manages API credentials for multiple providers (Anthropic Claude, Google Gemini, GitHub).

  • Works in 3 steps: Copy the example config → Edit config.json and add your API keys → Ensure the config file is in .gitignore…
  • Skills need to access stored API keys for external service invocations
  • SKILL.md covers Supported Providers, Purpose, Usage by Other Skills and Setup Instructions, plus 7 more sections
  • Runs Python scripts from its folder; needs ANTHROPIC_API_KEY and GOOGLE_API_KEY

What it does

API Credentials is an agent skill from oaustegard/claude-skills. Securely manages API credentials for multiple providers (Anthropic Claude, Google Gemini, GitHub). Use when skills need to access stored API keys for external service invocations.

Its SKILL.md is about 1.4k tokens, which your agent loads only when the skill is triggered. The skill folder holds 6 other files, including scripts and assets (for example `README.md` and `scripts/credentials.py`).

It sits in AI & LLM Engineering. It works with GitHub, Google Gemini and Anthropic API. The repository describes itself as: My collection of Claude skills. The licence is MIT.

When your agent uses it

  • Skills need to access stored API keys for external service invocations

Example prompts

  • “/api-credentials”

Requirements

  • Python 3
  • A credential in ANTHROPIC_API_KEY
  • A credential in GOOGLE_API_KEY

Workflow steps

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

  1. Copy the example config
  2. Edit config.json and add your API keys
  3. Ensure the config file is in .gitignore (already configured)

What it can do on your machine

Read from SKILL.md and the folder at commit 559a6cd. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Ships 1 file 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 these keys or tokens, usually read from environment variables:

    • ANTHROPIC_API_KEY
    • GOOGLE_API_KEY
    • GITHUB_API_KEY
    • API_CREDENTIALS
    • GITHUB_TOKEN

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

Context cost

API Credentials loads about 1.4k tokens when it runs. Until then it costs about 49 tokens; SKILL.md has 456 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~49
When it runs · the whole SKILL.md, loaded when a task matches
~1.4k

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 oaustegard/claude-skills at commit 559a6cd, republished under its MIT licence (© oaustegard). 456 words, ~1,438 tokens.

Download SKILL.mdSave it as .claude/skills/api-credentials/SKILL.md (or your agent's skills folder). This skill also uses 4 other files; get the full folder from GitHub.
name
api-credentials
description
Securely manages API credentials for multiple providers (Anthropic Claude, Google Gemini, GitHub). Use when skills need to access stored API keys for external service invocations.
metadata.version
0.0.3

API Credentials Management

🚨 DEPRECATED: This skill is no longer needed for hosted skills environments.

New approach: Skills now read credentials directly from project knowledge files:

  • ANTHROPIC_API_KEY.txt, GOOGLE_API_KEY.txt, GITHUB_API_KEY.txt (recommended)
  • Or API_CREDENTIALS.json (combined file)

See updated skill documentation:

Legacy use only: This skill may still be useful for local development environments or backward compatibility.

⚠️ WARNING: This is a PERSONAL skill - DO NOT share or commit with actual credentials!

This skill provides secure storage and retrieval of API credentials for multiple providers. It serves as a dependency for other skills that need to invoke external APIs programmatically.

Supported Providers

  • Anthropic (Claude API)
  • Google (Gemini API, Vertex AI, etc.)
  • GitHub (GitHub API, Personal Access Tokens)
  • Extensible for additional providers

Purpose

  • Centralized credential storage for multiple API providers
  • Secure retrieval methods for dependent skills
  • Clear error messages when credentials are missing
  • Support for multiple credential sources (config file, environment variables)

Usage by Other Skills

Skills that need to invoke APIs should reference this skill:

Anthropic Claude API
python
import sys
sys.path.append('/home/user/claude-skills/api-credentials/scripts')
from credentials import get_anthropic_api_key

try:
    api_key = get_anthropic_api_key()
    # Use api_key for Claude API calls
except ValueError as e:
    print(f"Error: {e}")
Google Gemini API
python
import sys
sys.path.append('/home/user/claude-skills/api-credentials/scripts')
from credentials import get_google_api_key

try:
    api_key = get_google_api_key()
    # Use api_key for Gemini API calls
except ValueError as e:
    print(f"Error: {e}")
GitHub API
python
import sys
sys.path.append('/home/user/claude-skills/api-credentials/scripts')
from credentials import get_github_api_key

try:
    api_key = get_github_api_key()
    # Use api_key for GitHub API calls
except ValueError as e:
    print(f"Error: {e}")

Setup Instructions

  1. Copy the example config:
bash
cp /home/user/claude-skills/api-credentials/assets/config.json.example \
   /home/user/claude-skills/api-credentials/config.json
  1. Edit config.json and add your API keys:
json
{
  "anthropic_api_key": "sk-ant-api03-...",
  "google_api_key": "AIzaSy...",
  "github_api_key": "ghp_..."
}
  1. Ensure the config file is in .gitignore (already configured)
Option 2: Environment Variables

Set environment variables for the providers you need:

bash
# Anthropic Claude
export ANTHROPIC_API_KEY="sk-ant-api03-..."

# Google Gemini
export GOOGLE_API_KEY="AIzaSy..."

# GitHub
export GITHUB_TOKEN="ghp_..."
# or
export GITHUB_API_KEY="ghp_..."

Add to your shell profile (~/.bashrc, ~/.zshrc) to persist.

Priority

Credential retrieval follows this priority for each provider:

  1. config.json in the skill directory (highest priority)
  2. Environment variable (ANTHROPIC_API_KEY or GOOGLE_API_KEY)
  3. ValueError raised if neither is available

Security Notes

  • Never commit config.json with real credentials
  • The config.json file should be in .gitignore
  • Only config.json.example should be version controlled
  • Consider using environment variables in shared/production environments
  • Rotate API keys regularly
  • Skills should never log or display full API keys
Show full SKILL.md (176 more words)Show less

File Structure

api-credentials/
├── SKILL.md              # This file
├── config.json           # YOUR credentials (gitignored)
├── scripts/
│   └── credentials.py    # Credential retrieval module
└── assets/
    └── config.json.example  # Template for users

Error Handling

When credentials are not found, the module raises ValueError with clear guidance:

  • Where to place config.json
  • How to set environment variables
  • Links to provider consoles for key generation

Skills should catch ValueError exceptions and handle appropriately.

Available Functions

get_anthropic_api_key() → str

  • Returns Anthropic API key
  • Raises ValueError if not configured

get_google_api_key() → str

  • Returns Google API key
  • Raises ValueError if not configured

get_github_api_key() → str

  • Returns GitHub API token (Personal Access Token)
  • Raises ValueError if not configured

get_api_key_masked(api_key) → str

  • Returns masked version for safe logging
  • Example: "sk-ant-...xyz"

verify_credential(provider) → bool

  • Checks if provider is configured
  • Returns True/False without raising exceptions
  • Providers: 'anthropic', 'google', 'github'

Adding New Providers

To support additional providers:

  1. Add field to assets/config.json.example
  2. Add getter function to scripts/credentials.py:
    python
    def get_provider_api_key() -> str:
    # Follow existing pattern with config file + env var
    pass
  3. Add to verify_credential() mapping
  4. Update this documentation

Token Efficiency

This skill uses ~300 tokens when loaded but saves repeated credential management code across multiple skills that invoke external APIs. It provides a single, consistent pattern for all credential handling.

© oaustegard, 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 4 other files (scripts, assets) in api-credentials of oaustegard/claude-skills.

  • SKILL.md
  • .gitignore
  • README.md
  • assets/config.json.example
  • scripts/credentials.py

Open the folder on GitHubat commit 559a6cd

Compare with similar skills

API Credentials 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.

API Credentials compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
API Credentials this skilloaustegard/claude-skills150—~1.4kAutomated safety check: PassMIT
ModLens Image Vision Bridgeliustack/modlens4.1k—~1.3kAutomated safety check: NotesMIT
Embeddings via 9Routerdecolua/9router30k—~604Automated safety check: PassMIT
Using Ccproxy Inspectorstarbaser/ccproxy348—~2.7kAutomated safety check: PassCustom licence
Using Ccproxy APIstarbaser/ccproxy348—~4kAutomated safety check: PassCustom licence
Deploykangraemin/claude-inspector131—~739Automated safety check: NotesMIT

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Works with

Categories

Questions about API Credentials

What does API Credentials do?

Securely manages API credentials for multiple providers (Anthropic Claude, Google Gemini, GitHub). API Credentials is an agent skill from oaustegard/claude-skills. Securely manages API credentials for multiple providers (Anthropic Claude, Google Gemini, GitHub).

When should I use API Credentials?

API Credentials fits situations like: skills need to access stored API keys for external service invocations.

How do I install API Credentials in Claude Code?

Run `npx skills add oaustegard/claude-skills --skill api-credentials -a claude-code`. Or copy the skill folder (api-credentials in oaustegard/claude-skills) into .claude/skills/api-credentials in your project. Claude Code loads it when a task matches its description.

How do I install API Credentials in Codex?

Run `npx skills add oaustegard/claude-skills --skill api-credentials -a codex`. Or copy the skill folder (api-credentials in oaustegard/claude-skills) into .agents/skills/api-credentials in your project. Codex loads it when a task matches its description.

Can I use API Credentials 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 oaustegard/claude-skills --skill api-credentials -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/api-credentials, .gemini/skills/api-credentials, .github/skills/api-credentials and .opencode/skills/api-credentials in your project.

What does API Credentials need to run?

Going by SKILL.md and its folder, API Credentials needs Python for the scripts in its folder and credentials named ANTHROPIC_API_KEY, GOOGLE_API_KEY, GITHUB_API_KEY and API_CREDENTIALS. Our summary lists: Python 3; A credential in ANTHROPIC_API_KEY; A credential in GOOGLE_API_KEY.

Does API Credentials 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 API Credentials 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 API Credentials use?

API Credentials is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does API Credentials use?

About 1.4k tokens (SKILL.md is roughly 5.8k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to API Credentials?

Skills that share tags, products or a category with API Credentials: ModLens Image Vision Bridge (liustack/modlens, 4.1k stars), Embeddings via 9Router (decolua/9router, 30k stars), Using Ccproxy Inspector (starbaser/ccproxy, 348 stars) and Using Ccproxy API (starbaser/ccproxy, 348 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains API Credentials?

oaustegard (a GitHub user) maintains it in oaustegard/claude-skills, which has 150 GitHub stars. The repository holds 93 skills in this directory. The repository was last updated on October 2, 2026.

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