FA-964 / Reliability / Member archive

Allow a half-open circuit probe: A stale timer probes a newly opened circuit generation · case 04

The circuit probe operation is admitted even though a stale timer probes a newly opened circuit generation.

Member previewVariant 4 · 3 implementations · 9 checks per implementation

Case contract

Return a Boolean admission decision for allow a half-open circuit probe. The record r must satisfy all of: r['open_delay'][0]-r['open_delay'][1] >= r['open_delay'][2]; r['probe_exclusive'] == 0; r['circuit_generation'][0] == r['circuit_generation'][1]; r['endpoint_health'][0] in r['endpoint_health'][1]; r['caller_deadline'][0] < r['caller_deadline'][1]. Extra tracing fields are ignored; validation does not mutate the record.

Why this case matters

A deterministic local contract for reliability. Each negative fixture violates exactly one invariant. No transport timing, persistence, cryptographic verification, or full protocol implementation is claimed.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
A stale timer probes a newly opened circuit generation	`true`	`false`	Failed

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