docs: document sidecar stderr forwarding and host-backed filesystem budget#1815
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…udget Both are user-facing behavior changes that shipped without docs. - debugging.mdx: sidecar logs are forwarded to the host's stderr as they arrive, so a still-running sidecar's warnings are visible rather than only replayed if it dies. Notes the bounded postmortem excerpt (first 16 KiB + last 48 KiB, truncation stated inline) and points at AGENTOS_LOG_FILE for the complete log. - resource-limits.mdx: maxFilesystemBytes now also governs host-backed paths, which never reach the virtual filesystem and so are checked separately on write. Documents the honest caveat that this separate check is per-file while the VFS side is per-VM total, so a guest can still exceed its budget by spreading data across many host-backed files, and recommends bounding the host directory until that check aggregates per VM. The interim AGENTOS_SIDECAR_STDERR knob is intentionally not documented: it was removed in favor of unconditional forwarding to match the Rust client. Not validated with `pnpm --dir website build`: `website` is excluded from the workspace in this checkout by a pre-existing local workaround, so the build cannot run here. MDX table/fence structure was checked instead.
This was referenced Jul 20, 2026
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This was referenced Jul 20, 2026
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Both are user-facing behavior changes that shipped without docs.
debugging.mdx: sidecar logs are forwarded to the host's stderr as they
arrive, so a still-running sidecar's warnings are visible rather than only
replayed if it dies. Notes the bounded postmortem excerpt (first 16 KiB +
last 48 KiB, truncation stated inline) and points at AGENTOS_LOG_FILE for
the complete log.
resource-limits.mdx: maxFilesystemBytes now also governs host-backed paths,
which never reach the virtual filesystem and so are checked separately on
write. Documents the honest caveat that this separate check is per-file
while the VFS side is per-VM total, so a guest can still exceed its budget
by spreading data across many host-backed files, and recommends bounding
the host directory until that check aggregates per VM.
The interim AGENTOS_SIDECAR_STDERR knob is intentionally not documented: it
was removed in favor of unconditional forwarding to match the Rust client.
Not validated with
pnpm --dir website build:websiteis excluded from theworkspace in this checkout by a pre-existing local workaround, so the build
cannot run here. MDX table/fence structure was checked instead.