oauth
by mcollinaoauth helps you implement and troubleshoot OAuth 2.0/2.1 in Fastify apps for login, access tokens, PKCE, refresh tokens, and route protection. Use it as an oauth guide for backend development when you need practical oauth usage, install steps, and help resolving redirect URI, scope, CSRF, or token validation issues.
This skill scores 82/100, which means it is a solid directory listing for users who need an OAuth-focused Fastify helper. The repository gives enough concrete workflow guidance to justify installation, though users should still expect some manual adaptation because the skill lacks bundled support files and an explicit install command.
- Strong, specific trigger coverage for OAuth 2.0/2.1 tasks in Fastify, including PKCE, client credentials, device flow, refresh rotation, JWT validation, and introspection/revocation.
- Substantial workflow content: valid frontmatter, a long SKILL.md body, headings, code fences, and repo/file references make the skill more operational than a generic prompt.
- Good install-decision value from the description: it clearly states when to use the skill and calls out common troubleshooting cases like redirect URI mismatches, CSRF, and scope issues.
- No install command and no companion scripts/references/resources, so users may need to translate the examples into their own project structure.
- The visible excerpt is strong on implementation guidance but appears Fastify-specific, so it is less suitable for non-Fastify OAuth workflows.
Overview of oauth skill
What the oauth skill does
The oauth skill helps you implement and troubleshoot OAuth 2.0/2.1 flows in Fastify apps, with a practical focus on login, access tokens, route protection, PKCE, refresh tokens, and token validation. It is most useful when you need the oauth skill for backend work, not just a conceptual explanation of OAuth.
Who should install it
Install oauth if you are building or maintaining a Fastify backend and need a repeatable oauth guide for authentication or authorization decisions. It fits engineers who already know their provider, callback URL, and session strategy, but want help turning that into a working integration.
What makes it different
This skill is not a generic OAuth explainer. It centers on Fastify integration patterns and common operational problems: redirect URI mismatches, scope handling, CSRF protection, token rotation, and compliance with RFC 6749, 6750, 7636, 8252, and 8628. That makes the oauth skill more useful when the blocker is implementation detail, not terminology.
How to Use oauth skill
Install oauth in your workspace
Use the standard install flow: npx skills add mcollina/skills --skill oauth. After the skill is added, open SKILL.md first, then inspect tile.json for the short summary and any repo-specific naming cues. For this repo, there are no extra rules/, resources/, or scripts/ folders to chase.
Give the skill the right input
The oauth install step is only the start; the quality of the output depends on how clearly you describe the OAuth job. Good inputs name the provider, flow, callback URL, session model, and security constraint. For example: “Set up Authorization Code + PKCE in Fastify for Google login, with server-side sessions and scope openid profile email.” That is much better than “add OAuth.”
Start from the implementation path
For practical oauth usage, read the step-by-step section in SKILL.md first and then map it to your app structure. The most useful first pass is usually:
- install the needed Fastify auth dependencies,
- register the OAuth plugin,
- wire callback handling,
- validate tokens and session state,
- verify redirect URI and scope behavior.
Tune prompts for backend development
For oauth for Backend Development, mention the environment constraints that affect implementation: TypeScript or JavaScript, cookie/session strategy, whether the app is server-rendered or API-only, and whether you need one provider or several. If you are asking the skill to debug, include the exact error, the provider response, and the current callback or token-check code path.
oauth skill FAQ
Is this skill only for Fastify apps?
Yes, the oauth skill is centered on Fastify integration. If you are using another stack, it can still help you reason about OAuth flow design, but the code and install guidance are most valuable in a Fastify backend.
Do I need OAuth experience to use it?
No, but you do need to know your target outcome. Beginners can use the oauth skill successfully if they can answer basic setup questions like provider name, redirect URI, and whether they want login or API access. If those are unclear, the first output will be weaker.
When should I not use oauth?
Do not use it if you only need a one-off explanation of OAuth concepts or if your app does not use Fastify. In those cases, a generic oauth guide may be enough, but the skill will add less value than it does for implementation and debugging.
How is this better than a normal prompt?
A normal prompt often misses the flow-specific details that break OAuth projects: PKCE handling, session storage, token validation, and redirect mismatch debugging. The oauth skill is better when you want a working backend integration, not just a high-level summary.
How to Improve oauth skill
Provide the exact flow and trust model
The biggest quality boost comes from stating whether you need authorization code with PKCE, client credentials, device flow, or token introspection. Also say whether your app should store tokens, rely on sessions, or act only as a resource server. That lets the oauth skill avoid broad answers.
Share the failure mode, not just the goal
If the first attempt fails, send the precise error and the stage where it happens: login redirect, callback, token exchange, session creation, or API request. For example, “Callback returns 400 because redirect URI differs by trailing slash” is more useful than “OAuth is broken.”
Ask for implementation-ready output
The best oauth usage prompts ask for files, code shape, and verification steps. Example: “Show the Fastify plugin registration, callback handler, and a checklist for testing with Google OAuth in local development.” That gives you something you can apply directly, not just read.
Iterate on security and fit
After the first result, refine for the issues that matter most in production: scope minimization, cookie flags, refresh token rotation, and JWT validation rules. If the output feels too generic, narrow it with one provider, one app type, and one deployment environment so the oauth skill can produce a more accurate backend plan.