Individual skill
oauth2-flow-implementation
Use when asked to implement, debug, validate, or explain an OAuth 2.1 flow: auth code with PKCE, client credentials, device, or refresh. Also for a failing token exchange. Not for irreversible work.
.devin/skills/oauth2-flow-implementation/SKILL.md
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# OAuth 2.0 flow implementation
## Contract
| Field | Bound contract |
|---|---|
| Trigger | Implementing, debugging, or validating an OAuth 2.0/2.1 flow (authorization code+PKCE, client credentials, device flow, refresh rotation), token validation, or RFC compliance. Also fires when explaining why a token exchange fails or a flow rejects a request. |
| Authority | Reversible local: writes only inside the target project's authentication implementation directory; rollback is version control. No remote mutation except the user-gated live token exchange test required to verify the flow end to end. Covers auth flows, secret handling, and test-driven token exchange. |
| Side effect | Writes authentication code, routes, and test files. Stores tokens server-side. No credential provisioning, user account mutation, or infrastructure changes outside the auth implementation. |
| Done | Authentication code written and verified through a successful end-to-end token exchange or rotation against the real authorization server, with all secrets redacted and no implicit flow or response_type=token. |
## Inputs
Required: