name: architecture-preflight description: Run before planning any feature to validate architecture boundaries, standards alignment, and ADR need

Architecture Preflight

You are preparing to plan and implement a feature. Determine the feature name from the user's request; if it is not provided, ask before proceeding.

Before generating any code or detailed plan, produce an Architecture Preflight Report.

1. Summary

• What is the feature or change?
• What input specs are being used (NFRs: features/<feature_name>/nfrs.md, Gherkin: features/<feature_name>/acceptance.feature)?
• What affected modules or layers are in scope?

2. Standards Check

For each of the following, state which architectural rules apply (cite file and section):

• Layering (from docs/backend/architecture/ARCH_CONTRACT.md)
• API conventions (from docs/backend/architecture/API_CONVENTIONS.md)
• Auth/security patterns (from docs/backend/architecture/SECURITY_AUTH_PATTERNS.md)
• Error model and response shape
• Logging and observability expectations

3. Boundary Analysis

• What modules or services will this code touch?
• Are any boundary rules at risk of violation? (from docs/backend/architecture/BOUNDARIES.md)
• Does this require a new interface between services?

3.5 Repository Scope Analysis

Before proceeding to ADR determination, validate repository scope. See: docs/REPO_SCOPE_ANALYSIS_GUIDANCE.md

Verify the "Repository Scope" section in features/<feature>/nfrs.md is complete:

• One box is checked: "This repository only" OR "Multiple repositories" (with table)
• If multi-repo: all repos, owners, modules, and contracts are documented
• "Primary Owner" and "Key Cross-Repo Contracts" are listed

HALT if incomplete. Request the feature owner complete the Repository Scope section. Specify what is missing.

Once complete:

1. Confirm THIS repo is listed as owner in the scope table (stop if not)
2. For each external repo listed: document the contract it exposes
3. Identify module/service impact in THIS repo only — do not implement other repos' portions

Decision: Is this a single-repo or multi-repo feature? Proceed with boundary analysis for THIS repo's portion only.

4. ADR Decision

Choose one:

• ADR required → Include proposed ADR title and reason
• No ADR needed → Explain why

5. Tests Required

• What test types are needed? (unit, contract, integration, evals)
• What test coverage or metrics are required by the NFRs?

6. Risks & Unknowns

• List assumptions, open design questions, or external risks
• Flag any missing constraints, incomplete specs, or potential conflicts

Write this report to features/<feature_name>/architecture_preflight.md.

If any spec inputs are missing, ask before proceeding.