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api pods lose their logs on restart, so a failed build's real cause
("Workflow generator: structural validation failed: ...") could only be read
from a pod log that may already be gone. Session 01a08fd0 hit exactly that.
Carry the generator's own diagnostics back with the result instead:
BuildNodesResult and ErrorCard gain a ``diagnostics`` list, and build_nodes
records one entry per failed generation attempt -- initial AND the corrective
retry, so an error that changes between attempts stays visible -- plus the
all-rejected and exception paths.
Each entry holds a server-side UTC ``at`` (so the surviving pod-log window can
be searched around it), ``source``, ``attempt``, the generator's ``message``
(the same text the server logs), its ``codes``, and the full structured
``errors`` including ``node_id``. That is strictly more than the log line
carries: for an UNRESOLVED_REFERENCE the export now names the offending node.
The list rides in the ErrorCard's item payload, which is what the streamed
conversation item -- and therefore the exported debug log -- preserves. It is
not rendered in the UI. Retries that eventually succeed keep their breadcrumbs.
Deliberately not mirroring the "structural validation failed" prefix: build.py
cannot tell structural failures from the rest without duplicating the
generator's code taxonomy, which would go stale.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>