diff --git a/AGENTS.md b/AGENTS.md
index 7ff0eb4d4..5c7359fc7 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -217,6 +217,14 @@ See [TESTING.md](TESTING.md) for the full multi-agent E2E guide.
 
 ### PR Screenshots
 
+> **Screenshots for PRs, reviews, chats, and demos are disposable artifacts, not
+> tests.** Save them under ignored `test-results/` and use the standalone
+> `just desktop-screenshot` helper. Do not create or modify a committed
+> Playwright spec merely to capture evidence, and do not leave `.screenshot()`
+> calls behind: they do not assert pixels or provide regression coverage. A
+> committed visual-regression test must deliberately use a reviewed
+> `toHaveScreenshot()` baseline.
+>
 > **Do NOT use `buzz upload`, the relay media endpoint, or any third-party
 > image host for PR screenshots.** Relay media URLs fail through GitHub's camo
 > proxy. Always use `scripts/post-screenshots.sh` for PNGs before linking them
diff --git a/desktop/src-tauri/src/managed_agents/screenshot_skill.md b/desktop/src-tauri/src/managed_agents/screenshot_skill.md
index 361e747fe..b1ffe8cd2 100644
--- a/desktop/src-tauri/src/managed_agents/screenshot_skill.md
+++ b/desktop/src-tauri/src/managed_agents/screenshot_skill.md
@@ -2,11 +2,30 @@
 name: desktop-screenshot
 description: >
   Capture desktop app screenshots and post them to GitHub PRs with immutable URLs.
-version: 1
+version: 2
 ---
 
 # Desktop Screenshot Skill
 
+## CRITICAL: Screenshots Are Disposable Artifacts, Not Tests
+
+Screenshots captured for a PR, review, chat, or demo belong under ignored
+`test-results/` (or another temporary directory). **Do not create or modify a
+committed Playwright spec just to capture evidence.** Use the standalone
+`just desktop-screenshot` helper below; if the desired state needs custom setup
+that the helper cannot express, use a temporary untracked script and delete it
+after capture.
+
+A committed Playwright test must assert behavior independently of any image it
+writes. A plain `page.screenshot()` or `locator.screenshot()` does not validate
+pixels and is not regression coverage. Do not leave such calls in tests as PR
+or chat artifacts. Visual regression testing is a separate, deliberate change:
+use a reviewed `toHaveScreenshot()` baseline and account for its CI stability
+and maintenance cost.
+
+Before committing screenshot work, inspect `git diff -- desktop/tests` and
+remove capture-only specs and incidental `.screenshot()` calls.
+
 ## CRITICAL: How to Host Screenshots for PRs
 
 **NEVER use `buzz upload`, the relay media endpoint, or any third-party image