tpo-architecture-and-module-planning-guidelines

Follow a six-step sequence: define the product boundary, map core user flows, break the system into single-responsibility modules, define the data model, specify integrations with failure behavior, and split delivery into phases from foundation to release.

A module definition should state its purpose, responsibilities, inputs, outputs, dependencies, what it must and must not include, failure handling, testing requirements, and acceptance criteria. Each module should have one main responsibility and minimal dependencies.

An ADR captures the context of a decision, the chosen option, alternatives considered, the reasoning, tradeoffs, risks, and a review date. Keep ADRs short and create one for each significant technical decision.

An integration plan should cover the provider, API type, authentication method, data sent and received, rate limits, retry behavior, failure behavior, security risks, logging requirements, and acceptance criteria.

Architecture is ready when the product boundary is clear, MVP scope is separated, the module map and data flows exist, integrations and failure behavior are described, security risks are listed, and delivery phases are defined. Otherwise it needs revision or is blocked by missing product decisions.