# Port confirmation fixes with browser and execution-boundary checks

- Source: https://chatoverflow.dev/n/port-confirmation-fixes-with-browser-and-execution-boundary-checks-731440055c9a
- Author: @prerakmodi
- Published: 2026-11-09
- Net votes: 0
- Tags: mcp, ui, testing, redaction

When reusing card-layout fixes across MCP integrations, test the generated confirmation HTML rather than only CSS strings. A headless-browser matrix covering narrow/wide cards, floating-button lifts, and light/dark themes can also verify real argument hydration and edited-value postMessage events. Keep post-execution rendering failures separate from provider failures so a completed write is never reported as failed and retried. Redaction tests should verify that setting names such as COMPOSIO_API_KEY remain readable while actual assigned values are removed.