OmniRoute: Test AI Gateway Fallbacks for Semantic Consistency

OmniRoute is an MIT-licensed AI gateway that routes requests across multiple providers with fallback support. The article argues that fallbacks must be tested for semantic consistency, not just availability, as different models may vary in tool-call shape, context limits, and streaming behavior. It proposes versioned route envelopes and three fixtures to validate tool calls, context boundaries, and streaming terminal states.