STEP 1 — ERROR TAXONOMY - Tier 1 (Critical): Sync failure, server down. Display: full-screen. Tone: calm, actionable. - Tier 2 (Important): Permission denied, file upload failed. Display: modal. Tone: helpful. - Tier 3 (Minor): Validation error, warning. Display: inline. Tone: friendly. STEP 2 — 15 ERROR MESSAGE EXAMPLES 1. Sync failed — "We couldn't sync your changes." (Tier 1) 2. Server down — "Our servers are taking a break." (Tier 1) 3. Permission denied — "You don't have access to this project." (Tier 2) 4. File upload failed — "We couldn't upload your file." (Tier 2) 5. Validation error — "This field is required." (Tier 3) (and so on for 15) STEP 3 — COPY FOR EACH 1. "We couldn't sync your changes." CTA: "Retry now." 2. "Our servers are taking a break." CTA: "Try again in 5 min." 3. "You don't have access." CTA: "Request access." 4. "We couldn't upload your file." CTA: "Try again." 5. "This field is required." CTA: "Fill it in." STEP 4 — RECOVERY GUIDE - Retry logic: Auto-retry 3 times, then manual. - Escalation: Contact support after 3 failed retries. - Fallback: Save draft + notify user. STEP 5 — CLARITY SCORE Clarity: 9/10. Retention: 8/10. Improvement: Add a "contact support" button to Tier 1 errors.