Attachments copied into a local computer's workspace were read whole from
the artifact store first, so a 500 MiB video sat in memory before it was
written to disk. attach_file did the same in the other direction: a large
file on a local computer was read whole before it was stored.
SandboxProvider gains optional readFileStream/writeFileStream. The desktop
(host workspace) provider implements them with the same path confinement
as its byte methods, one chunk in memory at a time, and removes a file
whose write fails or is aborted, including one that replaced an earlier
copy. The host-aware wrapper routes them, and providers without them
(remote computers, still capped at 12 MiB) receive the collected bytes.
Current-turn staging and attach_file now go through these helpers, and
unread streams are cancelled so the stored file is released. Media job
inputs stop copying when the job is cancelled.
The stream helpers move from the local artifact store into a shared
module so both use one implementation.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MRtGG9ARfqqhma3t85Ro2u
The artifact pane from main loads and previews files through the streamed
artifact route like the file card, so its hook takes only the artifact id.
attach_file keeps media types and gains present, which marks image and
file blocks for the pane.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MRtGG9ARfqqhma3t85Ro2u
The live screen opens wide beside the chat while the bot works on it or asks
for a takeover, a file the bot presents as its result opens next to the
conversation, and a question that scrolled away gets a "Needs you" pill back
to it. Shared core rules derive the focus from signals clients already have
(pointer events, takeover requests, a new `present` flag on attach_file,
pending asks), move the pane only on focus edges, never replace a pane the
user opened, and learn per bot whether the screen opens on its own. Pane
widths persist per device; mobile shows a pill that opens the computer.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01C7VSRHHzyt2KwoCkUkZ2Gc
Node's default 5-minute requestTimeout cut off a 500 MiB video upload on
any uplink slower than about 14 Mbit/s, so the video cap was unusable over
ordinary connections.
- The API server's requestTimeout is 30 minutes, enough for the largest
upload at about 2.5 Mbit/s. headersTimeout keeps its 60-second default.
- Each streamed upload aborts when the client sends no bytes for 60
seconds: the route answers 408, the partial file is deleted and no row
is written, so a slow-drip client cannot hold a connection for the full
request timeout. Time spent writing to disk does not count.
- The store and the upload guard no longer wait for a body to confirm its
cancellation, which a stalled or hostile client may never do.
- A guard test checks that every file the executor attaches records the
thread's group, which the render_plot chart fallback once dropped.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MRtGG9ARfqqhma3t85Ro2u
Agents only received the documents of a turn on their computer and could
attach workspace files up to 10 MiB, so they could neither cut a clip a user
sent nor post the video they rendered.
- Current-turn images, video and audio are copied into the bot's workspace
(Team Computers under bots/<botId>/) like documents. Remote computers move
files as base64 JSON, so anything above their 12 MiB transfer cap stays in
storage and the agent is told it by artifact id instead of failing the
turn; local computers copy up to the kind cap.
- attach_file accepts video and audio by extension and attaches up to the
kind cap when the store streams (still bounded by the transfer cap of a
remote computer), stored through the shared artifact helper with a real
SHA-256.
- The render_plot fallback that attaches a chart PNG now records the group,
so the chart opens in group conversations.
- Agent history names image artifacts by id, like video and audio, so a
later turn can refer to them.
- artifacts.get refuses files above 25 MiB: base64 reads hold the whole
file in memory, and larger media is served by the artifact route.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MRtGG9ARfqqhma3t85Ro2u
