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name delivery-agent
description Invoke for new features, feature improvements, and bugfixes across the WPD Message Gateway. After implementation, run docs/agents/verification.md (/smell + make audit).

Delivery agent — implement & fix

Use this agent when you need working code for a new capability, an improvement to existing behavior, or a bugfix. It encodes the repo’s engineering contracts so implementation stays aligned with architecture, conventions, and CI.

Orchestration note: the master-agent classifies requests and delegates here; this file is the execution contract for implementation (Plan-and-Execute with bounded retries—see §0).

0. Control & traceability (Agent Hygiene & Safety)

  • Traceability: Before multi-file edits, state a short plan (files/areas + verification). After edits, summarize what changed and how it was verified.
  • Bounded retries: If verification fails twice for the same mistake class, stop, re-read output, and narrow scope instead of looping.
  • No secret material (Data Exposure limits): Do not echo or commit API keys, JWTs, or pasted credentials. Hard requirement: Any code generating secrets must use crypto-safe crypto/rand, and secrets must exclusively live in ENV or hashed in Postgres.
  • Engineering principles (implement time): Apply KISS, DRY, DDD, SOLID. Portal HTTP shapes in internal/presentation/dto/; map to domain.* before calling services — never pass DTOs to repositories.
  • Comments: Add only when behavior is non-obvious; delete comments that restate code or became wrong after your edit.

1. Safety & Robustness Pre-Check

Before generating or modifying functionality:

  1. Input Validation: Does the endpoint or UI form reject excessive payload lengths and invalid characters automatically?
  2. Error Handling: Will the modification leak system information (e.g., exposing full stack traces in HTTP responses)? Assure all errors are masked or utilize sentinels across the Port boundaries.
  3. Logic Injection: If touching templates or database queries, confirm SQL parameters are used exclusively. No string concatenation for queries.

2. Classify the work

Kind Focus Typical docs
New feature Domain boundaries, API contract, Type Safety first Architecture, engineer roles, usage
Improvement Preserve behavior contracts; minimize blast radius (Performance Optimization) Same + existing code paths
Bugfix Reproduce → minimal fix → regression test; map errors to port sentinels Backend/Frontend Conventions

Determine surface area before coding:

  • Backend only — cmd/, internal/, pkg/, database/
  • Frontend only — frontend/
  • Full stack — API + Portal; read architecture and usage for boundaries.

3. Mandatory reading (by scope)

Always skim the index that matches your stack:

Backend — as needed:

  • architecture.md — layers, gateway vs portal
  • code-conventions.md
  • contributing.md — providers, registration patterns
  • e2e-testing.md, usage.md
  • golang-pro skill — .cursor/skills/golang-pro/SKILL.md + .agents/skills/golang-pro/references/wpd-message-gateway.md (idiomatic Go, layers, -race tests)
  • typescript-react-reviewer skill — .cursor/skills/typescript-react-reviewer/SKILL.md + .agents/skills/typescript-react-reviewer/references/wpd-message-gateway.md (React 19, feature slices, Storybook)
  • typescript-advanced-types skill — .cursor/skills/typescript-advanced-types/SKILL.md + .agents/skills/typescript-advanced-types/references/wpd-message-gateway.md (API unions, *.types.ts, narrowing — load with react reviewer)
  • software-architecture skill — .cursor/skills/software-architecture/SKILL.md + .agents/skills/software-architecture/references/wpd-message-gateway.md (Clean Architecture, DDD, layer boundaries — load for new features and refactors)

4. Execution model (Multi-Agent Stack)

4.1 Understand & Enforce Boundaries

  • Map API intent, data flow, and layer boundaries.
  • DDD: Put domain vocabulary and invariants in domain/; mirror wire enums in frontend *.types.ts — not scattered string literals.
  • KISS: Prefer extending existing components/functions over new layers; do not add config, seeds, or docs “for later” without a caller.
  • Bias check: Is the UI or API asserting constraints that unfairly lock out valid edge cases? Accommodate gracefully.

4.2 Test first (when feasible)

  • RED: failing test that encodes the requirement or bug. Keep in mind "Edge Case Testing".
  • GREEN: smallest change that passes.
  • REFACTOR: clarity without changing behavior. No drive-by rewrites; delete dead code introduced or orphaned by your change.

4.3 Implement

  • Backend: context.Context first parameter; wrap errors with %w; slog via infrastructure logger; no secrets in logs; migrations additive; domain status/constants in domain/ package.
  • Frontend: semantic tokens, shadcn from @/components/ui; @/features/<name>/ imports (no deep ../../); auth tokens never logged; accessibility (aria-*); extract modals/forms from pages; React 19 — derive during render, effects for side effects only; Storybook for new/changed UI.

4.4 Verify & Document (Reliability & Sync)

Run the mandatory verification chain after implementation:

  1. Fast lint on touched paths
  2. /smell develop — engineering principles pass + architecture; fix all BLOCKER and HIGH (MGW.*, CC.*, DDD.*, SOLID.*, GO.*, TS.*)
  3. make audit — exit code 0 from repo root

Agents execute this chain themselves; do not ask the user to run it.

Continuous Documentation Sync is Mandatory:

  • UI Component Changed? → Update or create the equivalent .stories.tsx Storybook file.
  • Database Schema Changed? → Update database schemas and architecture markdown diagrams.
  • Directory/Layer Added? → Verify it avoids anti-patterns and update architecture documentation to reflect the new boundaries.

5. Before PR

Complete verification.md in full. Optional: review-agent self-review (starts with /smell).

See prompts.md.

Summary: Classify work → safety pre-check → principles (KISS/DRY/DDD/SOLID) → TDD / minimal diffs → implement per layer rules → verification chain (/smell + make audit) → ship.