playwriter
Code Issues

improve accessibilitySnapshot diff: preserve baseline, use contextLines for hunks

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This commit is contained in:
Tommy D. Rossi
2025-11-27 15:25:29 +01:00
parent 36d0458243
commit 85dd937fe4
2 changed files with 6 additions and 4 deletions
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playwriter/src/mcp.ts
+4 -2
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@@ -404,13 +404,15 @@ server.tool(
if (showDiffSinceLastCall) {
const previousSnapshot = lastSnapshots.get(targetPage)
lastSnapshots.set(targetPage, snapshotStr)
if (!previousSnapshot) {
lastSnapshots.set(targetPage, snapshotStr)
return 'No previous snapshot available. This is the first call for this page. Full snapshot stored for next diff.'
}
const patch = createPatch('snapshot', previousSnapshot, snapshotStr, 'previous', 'current')
const patch = createPatch('snapshot', previousSnapshot, snapshotStr, 'previous', 'current', {
context: contextLines,
})
if (patch.split('\n').length <= 4) {
return 'No changes detected since last snapshot'
}
playwriter/src/prompt.md
+2 -2
View File
@@ -75,8 +75,8 @@ you have access to some functions in addition to playwright methods:
- `async accessibilitySnapshot({ page, search, contextLines, showDiffSinceLastCall })`: gets a human readable snapshot of clickable elements on the page. useful to see the overall structure of the page and what elements you can interact with.
- `page`: the page object to snapshot
- `search`: (optional) a string or regex to filter the snapshot. If provided, returns the first 10 matches with surrounding context
- `contextLines`: (optional) number of lines of context to show around each match (default: 10)
- `showDiffSinceLastCall`: (optional) if true, returns a unified diff patch showing only changes since the last snapshot call for this page. Disables search when enabled. Useful to see what changed after an action.
- `contextLines`: (optional) number of lines of context to show around each match (default: 10). Also controls context lines in diff output.
- `showDiffSinceLastCall`: (optional) if true, returns a unified diff patch showing only changes since the last non-diff snapshot call for this page. Disables search when enabled. Useful to see what changed after an action. Note: diff calls do not update the stored snapshot, so you can call diff multiple times and always compare against the same baseline.
- `getLatestLogs({ page, count, search })`: retrieves browser console logs. The system automatically captures and stores up to 5000 logs per page. Logs are cleared when a page reloads or navigates.
- `page`: (optional) filter logs by a specific page instance. Only returns logs from that page
- `count`: (optional) limit number of logs to return. If not specified, returns all available logs