[jehrr]

Problem

On 2026-10-20 the canary was dispatched with the proxy secret set. The scraper exited 5 (every navigation through the proxy timed out), and the check step ended the job red with only canary requires EXIT_OK=0, got 5. That step printed an ::error:: line only for a run without the proxy secret, so a failure through the proxy left no annotation. A missing or malformed output file also produced only a traceback.

Change

• The check step installs an exception hook that prints the traceback and then an ::error:: line. This covers a missing sidecar and a failed row assertion.
• A nonzero exit through the proxy secret now prints an ::error:: line with the exit code and the meaning of each code. The line also notes that a proxy rejecting its credential (HTTP 407) reaches Chromium as a navigation timeout, so an exit 5 should be checked against the secret first. On 2026-10-20 the same proxy credential produced Chromium navigation timeouts and an HTTP 407 for a plain HTTP client in another repository of this family.
• smoke_test.py gets a new check. It extracts the workflow's python3 -c check snippet and runs it in an empty directory with exit codes 0, 1, 3, 4, 5 and 6, with and without the proxy secret. Each run must fail and print ::error::.

Evidence

• The offline suite passes in a core-only venv (requirements.txt), and so do .github/ci_checks.py and --sample-check.
• Control 1: the old canary.yml with the new check makes the check fail. Exit 0 with a missing sidecar printed no ::error::.
• Control 2: the new canary.yml without the proxy-path print makes the check fail on ('true', '1', ...), with no ::error:: printed. After each control the file was restored and the suite was green again.
• The workflow still parses as YAML (PyYAML safe_load).

Not changed

• Scraper code, exit codes and thresholds.
• The proxy secret. Its credential is rejected with HTTP 407 as of 2026-10-20 08:21 UTC, and the owner has to replace it.

🤖 Generated with Claude Code

https://claude.ai/code/session_01CKsd7q25N19WzUZjrAdzx8