ClaudSkills / Security / identity-access

Oauth2 And Oidc From Scratch

Q: What is a Claude Code skill and how does the Oauth2 And Oidc From Scratch skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Oauth2 And Oidc From Scratch is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: Security · Sub-category: identity-access · Last updated: 2026-06-08

type:review

Use when implementing or reviewing OAuth 2.0 / OAuth 2.1 / OpenID Connect from scratch in a real codebase, choosing a flow (authorization code + PKCE, client credentials, BFF), validating ID tokens, storing tokens safely in browsers, sizing refresh-token rotation, or migrating off implicit / ROPC. Triggers: "should I use a JWT or session cookie", PKCE code_challenge/code_verifier, exact redirect_uri match, state vs nonce confusion, ID-token replay, refresh-token rotation, BFF (backend-for-frontend) pattern, token in localStorage warning. NOT for SAML / WS-Federation, building an authorization server (use a battle-tested IdP), passwordless-only flows (passkeys/WebAuthn), or session-cookie auth without a third-party IdP.

About this skill (catalog notes)

Oauth2 And Oidc From Scratch includes pricing or quota commentary; at least one code block. At roughly 2,254 words the SKILL.md is on the longer end of the catalog distribution.

Original author: curiositech
Indexed lastmod: 2026-06-08
Catalog position: Security · identity-access
Indexed related skills: 10

How Oauth2 And Oidc From Scratch fits the catalog

Oauth2 And Oidc From Scratch sits in the Security category under the identity-access sub-topic in the ClaudSkills catalog. There are 10 related skills indexed alongside it; comparing a few before installing usually reveals which fits your workflow best.

These notes are auto-generated from features detected in the SKILL.md file and from this catalog's structure — they aren't part of the source repository.

From the source SKILL.md

OAuth is small in spec and enormous in pitfalls — most production "auth bugs" are actually one of five recurring mistakes, and the IETF has been quietly hardening the protocol for a decade to close them. As of OAuth 2.1 (current draft draft-ietf-oauth-v2-1-15, March 2026), PKCE is mandatory for every client, the implicit grant is removed, the resource-owner-password-credentials grant is removed, and the authorization server MUST reject any redirect_uri that doesn't exactly match a registered URI. ([IETF — OAuth 2.1 draft-15][oauth-2-1])

What this skill does

Oauth2 And Oidc From Scratch is a community-contributed Claude Code skill in the identity-access sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/oauth2-and-oidc-from-scratch/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when implementing or reviewing OAuth 2.0 / OAuth 2.

Who uses this skill

The Oauth2 And Oidc From Scratch Claude Code skill is built for security engineers, penetration testers, DevSecOps practitioners, and development teams hardening codebases and infrastructure. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 117,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/oauth2-and-oidc-from-scratch
curl -L https://claudskills.com/skills/oauth2-and-oidc-from-scratch/SKILL.md \
  -o ~/.claude/skills/oauth2-and-oidc-from-scratch/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/oauth2-and-oidc-from-scratch/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/oauth2-and-oidc-from-scratch/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\oauth2-and-oidc-from-scratch\SKILL.md on Windows. See the full install guide for step-by-step instructions.

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Oauth2 And Oidc From Scratch Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/oauth2-and-oidc-from-scratch/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Oauth2 And Oidc From Scratch skill do?

Is this skill free to install?

Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.

When should I use the Oauth2 And Oidc From Scratch skill?

Use Oauth2 And Oidc From Scratch when your Claude Code task falls under the Security category — specifically in the identity access area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Oauth2 And Oidc From Scratch" or describe the task and let Claude pick). Browse related skills at /category/security/.

What is a Claude Code skill and how does the Oauth2 And Oidc From Scratch skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Oauth2 And Oidc From Scratch is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Source: https://github.com/curiositech/windags-skills/blob/HEAD/skills/oauth2-and-oidc-from-scratch/SKILL.md
Author: curiositech

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA

curiositech. (2026). Oauth2 And Oidc From Scratch [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/oauth2-and-oidc-from-scratch/

BibTeX

@misc{oauth2-and-oidc-from-scratch-2026,
  author    = {curiositech},
  title     = {Oauth2 And Oidc From Scratch [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/oauth2-and-oidc-from-scratch/}
}

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