diff --git a/AGENTS.md b/AGENTS.md
index ccad434d..9a1207c1 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -81,6 +81,12 @@ pnpm l10n:translate
 
 Use `pnpm l10n:translate:force` only when intentionally regenerating existing translations. Commit `src/lib/locales/*.json`, `lara.yaml`/`lara.lock` changes if produced, and verify placeholders/product names stayed intact.
 
+### Product analytics (mandatory for meaningful features)
+
+New features should almost always emit a PostHog event so we can see whether users actually discover and use them. Skip instrumentation only for very small changes where a dedicated event would create noise. Use clear, stable event names, avoid PII or note content, and include only safe metadata that helps evaluate adoption and failures.
+
+When adding or changing a meaningful user-facing feature, include the event name(s) in the Todoist completion comment alongside QA, docs, and code health. If intentionally not instrumenting a feature, explain why in the completion comment.
+
 ### Code health (mandatory)
 
 Pre-commit and pre-push hooks enforce **Hotspot Code Health** and **Average Code Health** ≥ thresholds in `.codescene-thresholds`. Both gates block commit/push. Thresholds are a **ratchet** — only go up. When pre-push sees improved remote scores, it updates `.codescene-thresholds`, stages it, and stops so you can commit the new floor with normal verified hooks before pushing again. Never add `// eslint-disable`, `#[allow(...)]`, or `as any`.