lamina-error-handlinglisted

# Error Handling (agent-native) Every failure mode gets a **`scenarios[]` entry** with actor-visible recovery — never blame the actor in copy or findings. ## Contract encoding ```yaml scenarios: - id: venue-conflict category: conflict trigger: operation: assign venue when: concurrent_edit ux: error_state recovery: refresh and retry; show who holds lock ``` | Error type | Design response | |------------|-----------------| | **Slip** (right goal, wrong execution) | Undo, constraints, immediate feedback | | **Mistake** (wrong goal/plan) | Better signifiers, conceptual model in copy | ## Checklists 1. "Human error" is design failure until proven otherwise. 2. Preserve actor input on recoverable failures. 3. Message: what happened → why (plain language) → next action. 4. No error codes without human explanation. 5. Automation failures: actor kept informed (no silent mode switches). ## Verify checks - Trigger each failure scenario on live product (actor walk or probe). - Double-submit / race scenarios (`idempotency-concurrency`). - Actor walk reports confusion at recovery step → finding. ## Anti-patterns - Blame-the-user copy. - Alert fatigue — warnings dismissed become slip enablers. - Modal for recoverable batch errors. - Training docs substituting for error-proofing. ## Related - [Edge Cases](../lamina-edge-cases/SKILL.md) - [Forms](../lamina-forms/SKILL.md) - [Feedback And Status](../lamina-feedback-and-status/SKILL.md)