verify

Verifying changes to this demo

The surface is the Streamlit app inside the container. Build the image from this directory, run it, and drive the UI with Playwright. pytest, ruff, and pyright are CI's job, not evidence.

Build and run

docker build . -t computer-use-demo:verify
docker rm -f cu-verify 2>/dev/null
docker run -d --name cu-verify \
  -e ANTHROPIC_API_KEY=$ANTHROPIC_API_KEY -e WIDTH=1024 -e HEIGHT=768 \
  -p 18501:8501 -p 18080:8080 -p 16080:6080 computer-use-demo:verify
until curl -sf localhost:18501/_stcore/health >/dev/null; do sleep 1; done

A cold build takes several minutes (apt, LibreOffice, a pyenv Python compile). The requirements.txt layer is cached separately, so source-only changes rebuild in seconds.

To iterate without rebuilding, copy sources over the baked copy before the first browser session compiles the script:

docker cp computer_use_demo/. cu-verify:/home/computeruse/computer_use_demo/

Streamlit's file watcher does not notice docker cp replacements once a session has run. Recreate the container instead of docker restart, which fails on a stale X lock (tint2: could not open display).

Drive the UI

Install Playwright in any venv (pip install playwright && python -m playwright install chromium) and run the script below. It sets the model, picks a tool version, optionally sets the thinking mode, sends a prompt, waits for the loop to go idle, then dumps the chat transcript and every HTTP exchange (request headers and JSON, response JSON) with auth headers redacted.

THINKING=Adaptive python drive.py 18501 claude-sonnet-5 computer_toolset_20260801 \
  "Take a screenshot, then zoom in on the taskbar and list the icons." out/ 240

Pass - for model or tool version to keep the default. THINKING=Off|Adaptive|Extended clicks that radio. TOKEN_EFFICIENT=1 ticks the beta checkbox.

What to read afterwards:

• out/chat.txt: the rendered conversation, including Tool Use: <name> lines and any error box with its traceback.
• out/exchange-NN.txt: one file per API round trip. Check tools, anthropic-beta, and the tool_use / tool_result blocks here rather than trusting the chat rendering.
• out/02-chat.png, out/04-http-logs-expanded.png: full-page screenshots.