Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add aj-geddes/useful-ai-prompts --skill oauth-implementationgit clone --depth 1 https://github.com/aj-geddes/useful-ai-promptsWrote 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/aj-geddes/useful-ai-prompts/oauth-implementation)<a href="https://agentmods.dev/skills/aj-geddes/useful-ai-prompts/oauth-implementation"><img src="https://agentmods.dev/badge/skills/aj-geddes/useful-ai-prompts/oauth-implementation/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.
<a href="https://agentmods.dev/skills/aj-geddes/useful-ai-prompts/oauth-implementation"><img src="https://agentmods.dev/badge/skills/aj-geddes/useful-ai-prompts/oauth-implementation.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
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 | $0.00039 | $0.00555 |
| Opus 5 | $0.00019 | $0.00278 |
| Sonnet 5 | $0.00008 | $0.00111 |
| Haiku 4.5 | $0.00004 | $0.00056 |
Grade A, and why
oauth-implementation 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 9d 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 — 96 lines — stays where its author put it; the contents beside it link to each section on GitHub.
OAuth Implementation
Table of Contents
Overview
Implement industry-standard OAuth 2.0 and OpenID Connect authentication flows with JWT tokens, refresh tokens, and secure session management.
When to Use
- User authentication systems
- Third-party API integration
- Single Sign-On (SSO) implementation
- Mobile app authentication
- Microservices security
- Social login integration
Quick Start
Minimal working example:
// oauth-server.js - Complete OAuth 2.0 implementation
const express = require("express");
const jwt = require("jsonwebtoken");
const crypto = require("crypto");
const bcrypt = require("bcrypt");
class OAuthServer {
constructor() {
this.app = express();
this.clients = new Map();
this.authorizationCodes = new Map();
this.refreshTokens = new Map();
this.accessTokens = new Map();
// JWT signing keys
this.privateKey = process.env.JWT_PRIVATE_KEY;
this.publicKey = process.env.JWT_PUBLIC_KEY;
this.setupRoutes();
}
// Register OAuth client
registerClient(clientId, clientSecret, redirectUris) {
this.clients.set(clientId, {
clientSecret: bcrypt.hashSync(clientSecret, 10),
// ... (see reference guides for full implementation)
Reference Guides
Detailed implementations in the references/ directory:
| Guide | Contents |
|---|---|
| Node.js OAuth 2.0 Server | Node.js OAuth 2.0 Server |
| Python OpenID Connect Implementation | Python OpenID Connect Implementation |
| Java Spring Security OAuth | Java Spring Security OAuth |
Best Practices
✅ DO
- Use PKCE for public clients
- Implement token rotation
- Store tokens securely
- Use HTTPS everywhere
- Validate redirect URIs
- Implement rate limiting
- Use short-lived access tokens
- Log authentication events
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.
- 9d ago First seen · 96 lines · 39 tokens per session scan A dc3717275952
oauth-implementation is a skill published in the GitHub repository aj-geddes/useful-ai-prompts (338 stars, last pushed 6mo ago), licensed MIT. It adds 39 tokens to every session and 555 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 2026-09-03.
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