[AW Top 10] 04 Diagnose agents that end without terminal safe output #65932

Priority 4/10 | 15 source issues | Impact 4/5 | Confidence 3/5 | Effort 3/5

One assignment, one coherent fix

Many workflows across Copilot, Claude and Aider engines finish without emitting a terminal safe output and report only that runtime diagnostics could not be collected. The failure issues carry no root cause, which blocks triage of the shared failure.

Implementation scope

Capture the last engine events, exit status and timeout state in the missing terminal safe output incompletion report so the cause is visible, and classify timeouts and denial exits distinctly. Implement the change in the failure-reporting path and the harness diagnostics collection.

Done when

• The failure issue body includes the engine exit status, last tool activity and timeout classification.
• A unit test covers the diagnostic for runs that exit without safe outputs.

Why now

More than a dozen open issues report this symptom without a cause, so better diagnostics unlock root-cause analysis for all of them. Confidence is moderate because the underlying causes are probably varied.

Unchanged AW sources close only after this summary is completed. Newer source activity and not-planned retirement do not trigger source closure. Assigned summaries are frozen; unassign to allow reclustering.

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