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.
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.
[](https://agentmods.dev/skills/oaustegard/claude-skills/api-credentials)<a href="https://agentmods.dev/skills/oaustegard/claude-skills/api-credentials"><img src="https://agentmods.dev/badge/skills/oaustegard/claude-skills/api-credentials.svg" alt="Measured on agentmods" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00038 | $0.01348 |
| Opus 5 | $0.00019 | $0.00674 |
| Sonnet 5 | $0.00008 | $0.00270 |
| Haiku 4.5 | $0.00004 | $0.00135 |
Grade A, and why
api-credentials 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 8d 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.
How it starts
The opening of the file, as written. The whole thing — 206 lines — stays where its author put it; the contents beside it link to each section on GitHub.
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
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
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}")
What ships with it
4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 8d ago First seen · 206 lines · 38 tokens per session scan A 7f7817e21fdb
api-credentials is a skill published in the GitHub repository oaustegard/claude-skills (147 stars, last pushed yesterday), licensed MIT. It adds 38 tokens to every session and 1,348 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 2026-08-30.
Other skills, from other repositories
superdesign
Design or redesign frontend UI, presentations, and graphics on the Superdesign canvas with a choice of leading AI models. Use whenever the user wants to design a page, feature, flow, slide deck, or brand-new product; improve or reproduce existing UI; compare design results across top models; explore visual variants…
Linear
Managing Linear issues, projects, and teams. Use when working with Linear tasks, creating issues, updating status, querying projects, or managing team workflows.
chanlun-engine-skill
A Chinese-language stock-analysis skill based on Chan theory, a method for interpreting price-chart structures such as turning points and trading ranges.
youtube-summary
Summarize a YouTube video into structured notes — TL;DR, key takeaways, chapter-by-chapter breakdown, and reference links. Use when the user shares a YouTube URL (or invokes /youtube-summary ) and wants a summary, takeaways, transcript notes, or a write-up of a talk, lecture, or tutorial. Fetches the transcript and…
plangate
Use for any non-trivial task with 2+ open decisions/tradeoffs OR multiple implementation steps — instead of deliberating one question at a time in chat, write a structured plan to a file and let the user review it inline in vim with > Q: / > A: blockquote markers, then revise until agreed before touching any code.…
coinmarketcap
Expert assistant for CoinMarketCap Pro API — price quotes, listings, historical OHLCV, market metrics, Fear & Greed Index, CMC100/CMC20 indices, exchange data, DEX data, airdrops, trending, community sentiment. Covers 10+ endpoint categories across REST + MCP + x402 pay-per-call modes. Use when the user wants: current…