Contract for provisioning a user into a plugin's upstream service, with two
worked examples.
Four rules: never hardcode the admin credential; check-then-create (neither
API upserts); force a password change where the server supports it; verify by
actually logging in, since a 201 only means the row was written.
Immich (photos plugin) — verified end to end against a live 3.1.0 instance,
including every error body: duplicate email 400 "Email is not available",
missing field 400 validation, bad key 401. Includes a non-destructive probe
recipe to re-verify after an upgrade.
Jellyfin (jellyfin plugin) — route surface and auth model verified against
10.11.11; request bodies from working knowledge and marked as such. Differs
in shape: MediaBrowser token auth, multi-call create, no forced-password-change
flag, and accounts are per-instance (this deployment runs four independent
servers). Records the decision to set a generated password rather than create
blank-password accounts.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
