gcp_solution_architecture_agent/requirements.md

Requirements baseline (Step 0)

Functional requirements

• Accept authenticated HTTP requests for a stateless API.
• Persist application records with transactional consistency and indexed queries.
• Publish domain events asynchronously so request handling is decoupled from workers.
• Process events with retry and dead-letter behavior.
• Expose operational logs, metrics, and traces suitable for incident response.
• Support repeatable infrastructure deployment from version-controlled Terraform.

Non-functional requirements

• Managed, horizontally scalable runtime with no server maintenance.
• Regional production deployment with documented recovery assumptions.
• Encryption in transit and at rest; least-privilege service identities.
• API target of 99.9% monthly availability, p95 response time under 500 ms for normal reads, and at-least-once event processing.
• Auditability of infrastructure changes and application access.
• Validation must not provision cloud resources.

Constraints

• Google Cloud is the target cloud; product selection is explicitly deferred in this phase.
• Terraform is the infrastructure-as-code format.
• The solution must remain parameterized by project, region, and environment.
• No secrets or production identifiers may be committed.
• The deliverable is one repository derived from the workflow-agent template.

Assumptions

• A client or API gateway supplies authentication tokens and request-level authorization context.
• The application container is built and published by an existing CI pipeline.
• A single primary region is acceptable initially; disaster recovery is a follow-up design decision.
• Application code, schema migrations, and SLO dashboards are owned by the service team.
• Cloud billing, organization policy, and quota administration are available to the deployment operator.

Open questions

• What are peak requests per second, payload sizes, and retention periods?
• Which identity provider, tenant model, and authorization policy are required?
• What RPO/RTO and multi-region requirements apply?
• What data classification, residency, and deletion obligations apply?
• Which CI runner identity may deploy Terraform, and where is state hosted?
• Which event schemas, compatibility policy, and consumer ownership model apply?
• Are custom domains, WAF rules, private ingress, or VPC connectivity required?

Product selection deferred: true. The answers above are the input to Step 1; unresolved questions must be confirmed before production sizing.