FA-99808 / Tool call schema validation / Member archive
Default insertion overwrites explicit null · case 03
Default insertion overwrites explicit null.
Case contract
Copy an object and insert the default only when the key is absent; explicit null is preserved.
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 |
|---|---|---|---|
| null retained | {"x": 3} | {"x": null} | Failed |
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