This endpoint answers a bare 404 — "This service does not exist" — for a wrong
billing account, a wrong service name, a queue filed under the other product, and
a number nobody has configured yet. Four different jobs, one message, and nothing
on the Riposte screen could tell them apart. Two rounds went to guessing which one
it was.
The probe now walks there one step at a time and reports what it saw at each: the
billing accounts these credentials can reach, the services each product holds, the
queues in the chosen one. A failure names the step and lists the values that do
exist, which is what somebody can act on.
It also answers its own VERSION. When a test fails identically twice, the first
question is whether the new code is the code that ran, and nothing on the screen
could answer it.
And a failed diagnosis now exits non-zero with an "error" key. Returning ok:false
on exit 0 would have been worse than the 404 it replaces: the screen would call
the instance healthy while naming the step where it is not.
Verified end to end through the real entry point for six shapes — success under
either product, unreachable account, wrong account, number that is not a queue,
service with no queue, and a listing the IAM policy refuses.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TN1R4EnNFUV2Xwtd9q98tj
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