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docs: make technical prose concrete

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2026-08-09 15:27:21 +08:00
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packages/e2b/subprocess-e2b/README.md
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@@ -38,6 +38,6 @@ No direct invalidation; the named consumers own any request-prefix changes.
- **Control state shares the sandbox user's UID** — E2B runs every command as the same default user, so `0700`/`0600` modes cannot isolate `.dsh-e2b` control files from concurrently running sandbox processes. A background process could rewrite `pid`/`exit-code` or read a not-yet-consumed `environment` file. The adapter validates published values and refuses group ids whose negative form is unsafe to signal (`<= 1`), but real isolation needs an E2B per-command user or an out-of-band control channel.
- **Numeric process identities are not reuse-fenced** — E2B exposes numeric PID/PGID PTY input, signalling, and cleanup operations but no atomic identity-bound alternative. The adapter minimizes host round trips and live coverage exercises the reproducible stale-interrupt overlap; replacement is deferred until E2B adds an identity primitive or a failure demonstrates a narrower protocol.
- **The initial environment probe inherits sandbox defaults** — E2B merges command overrides with default environment entries, so the probe cannot blank unknown credential-shaped names before enumerating them. A same-UID untrusted process already in the sandbox could inspect that short-lived control shell; this POC therefore does not support secrets in sandbox-default environment variables and requires an E2B replacement-environment primitive to close the gap.
- **E2B exposes no signal fact** — an adapter-requested `SIGTERM` or `SIGKILL` is reported only when no wrapper-published direct exit code wins; every unrequested SDK exit remains an exit code, including values shaped like `128 + signal`.
- **E2B exposes no signal fact** — an adapter-requested `SIGTERM` or `SIGKILL` is reported only when no wrapper-published direct exit code wins; every unrequested SDK exit remains an exit code, including values equal to `128 + signal`.
- **Exact terminal stdin-wait inspection is unavailable** — E2B exposes the foreground process group but not the syscall evidence needed to prove it is waiting on fd 0, so the generic PTY backend falls back to controlled prompt markers and bounded silence.
- **Linux utility and E2B transport semantics are assumed** — there is no Windows, escaped-session recovery, or network-partition fidelity layer.