chore: update diff messaging from tests

- Add "No changes since last call" hints for snapshots/html/markdown

- Adjust truncation message to suggest search

- Update skill.md snapshot behavior doc

playwriter/src/clean-html.ts

@@ -83,6 +83,9 @@ export async function getCleanHTML(options: GetCleanHTMLOptions): Promise<string
       newContent: htmlStr,
       label: 'html',
     })
+    if (diffResult.type === 'no-change') {
+      return 'No changes since last call. Use showDiffSinceLastCall: false to see full content.'
+    }
     return diffResult.content
   }
 

playwriter/src/executor.ts

@@ -571,6 +571,9 @@ export class PlaywrightExecutor {
             newContent: snapshotStr,
             label: 'snapshot',
           })
+          if (diffResult.type === 'no-change') {
+            return 'No changes since last snapshot. Use showDiffSinceLastCall: false to see full content.'
+          }
           return diffResult.content
         }
 
@@ -869,7 +872,7 @@ export class PlaywrightExecutor {
       if (finalText.length > MAX_LENGTH) {
         finalText =
           finalText.slice(0, MAX_LENGTH) +
-          `\n\n[Truncated to ${MAX_LENGTH} characters. Better manage your logs or paginate them to read the full logs]`
+          `\n\n[Truncated to ${MAX_LENGTH} characters. Use search to find specific content]`
       }
 
       const images = screenshotCollector.map((s) => ({ data: s.base64, mimeType: s.mimeType }))

playwriter/src/page-markdown.ts

@@ -179,6 +179,9 @@ export async function getPageMarkdown(options: GetPageMarkdownOptions): Promise<
       newContent: markdown,
       label: 'content',
     })
+    if (diffResult.type === 'no-change') {
+      return 'No changes since last call. Use showDiffSinceLastCall: false to see full content.'
+    }
     return diffResult.content
   }
 

playwriter/src/skill.md

@@ -245,7 +245,7 @@ await accessibilitySnapshot({ page, search?, showDiffSinceLastCall? })
 - `search` - string/regex to filter results (returns first 10 matching lines)
 - `showDiffSinceLastCall` - returns diff since last snapshot (default: `true`). Pass `false` to get full snapshot.
 
-Snapshots return full content on first call, then diffs on subsequent calls. Diff is only returned when shorter than full content.
+Snapshots return full content on first call, then diffs on subsequent calls. If nothing changed, returns "No changes since last snapshot" message. Use `showDiffSinceLastCall: false` to always get full content.
 
 Example output: