[AW Top 10] 03 Diagnose agent assignment bad-credential failures #71071

Priority 3/10 | 2 source issues | Impact 3/5 | Confidence 4/5 | Effort 2/5

One assignment, one coherent fix

Issue Monster and LintMonster fail to assign Copilot because the dedicated assignment token returns bad credentials.

Implementation scope

Add a preflight check that validates the assignment token before assigning, report the credential source and expected scopes in a single actionable diagnostic, and fall back cleanly without repeating failure issues.

Done when

• A preflight test shows an invalid token produces one actionable diagnostic.
• Repeated assignment failures do not open duplicate failure issues.

Why now

Both failures show the same bad-credentials error from the same token source, so one diagnostic fix covers them; the token itself may need operator rotation.

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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