docs: update skills with snapshot diff information

Author: natorion

skills/chrome-devtools-cli/SKILL.md

@@ -120,6 +120,7 @@ chrome-devtools take_screenshot # Take a screenshot of the page viewport
 chrome-devtools take_screenshot --fullPage true --format "jpeg" --quality 80 # Take a full page screenshot as JPEG with quality
 chrome-devtools take_screenshot --uid "id" --filePath "s.png" # Take a screenshot of an element
 chrome-devtools take_snapshot # Take a text snapshot of the page from the a11y tree
+chrome-devtools take_snapshot --diff true # Return only the changes since the last snapshot
 chrome-devtools take_snapshot --verbose true --filePath "s.txt" # Take a verbose snapshot and save to file
 ```
 

skills/chrome-devtools/SKILL.md

@@ -22,6 +22,7 @@ description: Uses Chrome DevTools via MCP for efficient debugging, troubleshooti
 
 ### Efficient data retrieval
 
+- Use `diff: true` in `take_snapshot` to receive only the changes since the last snapshot (reset on navigation).
 - Use `filePath` parameter for large outputs (screenshots, snapshots, traces)
 - Use pagination (`pageIdx`, `pageSize`) and filtering (`types`) to minimize data
 - Set `includeSnapshot: false` on input actions unless you need updated page state