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Dev.to
6/25/2026
My tool said "clicked." Safari never saw it. macOS 26 quietly broke a system API.

My tool said "clicked." Safari never saw it. macOS 26 quietly broke a system API.

Short summary

macOS 26 silently broke CGEvent-based native clicks for Safari automation—the API returns success but the click never reaches WebContent, leaving developers hunting phantom permission bugs. The author's fix adds a macOS version check to their MCP server's diagnostics, surfacing the limitation in one line instead of requiring a weekend of debugging. The lesson: platform APIs that silently succeed are worse than those that fail loudly; always surface environmental context in diagnostics.

  • •macOS 26 regression: native CGEvent clicks silently fail with no error signal
  • •Root cause: tightened WebContent process event delivery semantics in Tahoe
  • •Solution: diagnostic tool that surfaces OS version to prevent multi-hour debugging hunts

Generated with AI, which can make mistakes.

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