Trace‑Driven Contracts vs. Schema‑Only: Why Dual Contracts Win

Schemas and IDLs ensure structural integrity of requests and responses. But modern choreography spans dozens of services and asynchronous edges — structure alone cannot verify temporal and causal intent.

ChoreoAtlas introduces dual contracts: ServiceSpec for service-level semantics (pre/post conditions) and FlowSpec for orchestration-level order, causality, and DAG constraints. When paired with trace data, contracts become executable and verifiable.

• Discover: bootstrap contracts from traces to reflect reality
• Refine: add semantics (CEL) and orchestration rules (temporal/causal/DAG)
• Validate: gate CI/CD and runtime by comparing traces to contracts

Result: fewer regressions, clearer ownership, safer refactors — and confident releases.