FA-99818 / Tool call schema validation / Member archive
One-of union accepts values matching both branches · case 03
One-of union accepts values matching both branches.
Case contract
One-of is valid when exactly one predicate matches.
Why this case matters
Tool argument validation prevents malformed structured payloads from entering a deterministic downstream operation.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| both match | true | false | Failed |
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