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docs(e2e): note Claude Code sandbox blocks Chromium Mach-port IPC

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Discovered while running Task 12's Playwright editor test: Chromium's
bootstrap_check_in Mach-port rendezvous is blocked by the sandbox,
which surfaces as a FATAL crash with "Permission denied (1100)"
rather than a path-related error. Document the workaround so future
agents running e2e tests in the same sandbox don't waste time
debugging it as a Playwright/network issue.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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mwiegand 2026-05-16 22:07:15 +02:00
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AGENTS.md
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@ -109,3 +109,10 @@ uv run playwright install chromium
Run with `uv run pytest -m e2e`. Excluded from the default fast suite
via the `e2e` marker.
**Sandbox note:** Chromium needs Mach-port IPC on macOS, which the
Claude Code sandbox blocks. When running e2e tests from a sandboxed
agent session, pass `dangerouslyDisableSandbox: true` on the
`uv run pytest -m e2e` invocation (the symptom of a sandboxed run is
a `FATAL` Chromium crash with `Permission denied (1100)` on Mach port
rendezvous, not a missing-binary or network error).