Error codes ensure that LogicBasis behaves predictably and transparently. Every error is deterministic, reproducible and tied to a clear cause. No randomness, no hidden states, no ambiguous messages.

The request is malformed or missing required fields. The system does not guess or auto‑correct — it stops cleanly and reports the issue.

The request requires authentication. No access is granted without a valid identity — no exceptions, no fallback behavior.

The identity is valid, but the action is not allowed. LogicBasis enforces strict boundaries and does not escalate privileges automatically.

A system‑side issue occurred. The engine does not hide internal errors behind generic messages — it reports them clearly and consistently.

Error codes are not conversational hints, not suggestions and not recovery guides. They describe the exact state — nothing more, nothing less.