Fix broken _snapshotForAI() tip in execute_playwright_code#126
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masnwilliams wants to merge 1 commit into
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Fix broken _snapshotForAI() tip in execute_playwright_code#126masnwilliams wants to merge 1 commit into
masnwilliams wants to merge 1 commit into
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The page._snapshotForAI() internal method is not available in the browser runtime, so the tool hint pointed users at a call that throws "page._snapshotForAI is not a function". Point it at the supported locator.ariaSnapshot() instead, which returns the page accessibility tree. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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masnwilliams
marked this pull request as ready for review
July 21, 2026 17:41
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Summary
The
execute_playwright_codetool description tells users:That method does not exist in the browser runtime — calling it throws
TypeError: page._snapshotForAI is not a function. The runtime drives the browser through a stealth-patched Playwright engine, which strips the internal_snapshotForAI()binding (andpage.accessibility.snapshot()).This updates the hint to the supported public API,
page.locator("body").ariaSnapshot(), which returns the page accessibility tree and works in the current runtime.Verification
Ran against a live browser session:
page._snapshotForAI()→TypeError: page._snapshotForAI is not a functionpage.accessibility.snapshot()→TypeError(namespace absent)page.locator("body").ariaSnapshot()→ returns the aria/accessibility tree ✅Description-only change; no runtime behavior affected.
Follow-ups (not in this PR)
kernel/docs → reference/mcp-server/tools/execute-playwright-code.mdx_snapshotForAI()in their own code (e.g.kernel-ai-sdk-agent,ImmortalBard)Note
Low Risk
Documentation string change on an MCP tool schema only; no execution or security impact.
Overview
Updates the
execute_playwright_codeMCP tool’scodeparameter description so the snapshot tip points atpage.locator("body").ariaSnapshot()instead ofpage._snapshotForAI(), which is not available in Kernel’s browser runtime.This is a description-only change; tool execution and Playwright behavior are unchanged.
Reviewed by Cursor Bugbot for commit c42b421. Bugbot is set up for automated code reviews on this repo. Configure here.