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Port from anomalyco/opencode#24730: Moonshot's JSON Schema validator rejects two shapes that the rest of the JSON Schema ecosystem accepts: 1. $ref nodes with sibling keywords. Moonshot expands the reference before validation and then rejects the node if keys like `description`, `type`, or `default` appear alongside $ref. MCP-sourced tool schemas commonly put a `description` on $ref-typed properties so the model sees the field hint — which worked on every provider except Moonshot. 2. Tuple-style `items` arrays (positional element schemas). Moonshot's engine requires ONE schema applied to every array element. Common in tool schemas generated from Go/Protobuf that model fixed-length arrays as `[{type:number}, {type:number}]`. Repairs applied in `agent/moonshot_schema.py`: - Rule 3: when a node has `$ref`, return `{"$ref": <value>}` only (strip every sibling). The referenced definition still carries its own description on the target node, which Moonshot accepts. - Rule 4: when `items` is a list, collapse to the first element schema (falling back to `{}` which is then filled by the generic missing-type rule). Preserves `minItems` / `maxItems` / other siblings. Tests: 10 new cases across TestRefSiblingStripping + TestTupleItems, plus the existing TestMissingTypeFilled::test_ref_node_is_not_given_synthetic_type still passes (it asserted plain $ref passes through; now it passes through as exactly `{"$ref": "..."}` which is strictly compatible). All 35 tests in test_moonshot_schema.py pass.