design-solution

Design Solution Skill

[!IMPORTANT] Turn an approved PRD or implementation goal into SRS/FRS technical requirements (How), architecture, contracts, and verification decisions.

Optional args: slug=, ticket=<id/url>, mode=interactive|autonomous|channel, channel=, auto_continue=true|false, profile=business|hybrid|technical.

Instructions

When the user asks to perform this workflow, execute the following steps:

Design Solution Workflow (SRS/FRS / How)

Goal: Produce a build-ready technical design with explicit boundaries, contracts, risks, and tests.

Steps

1. Load inputs:
   • Load baseline SRS/FRS section, common-software-requirements, PRD or ticket, implementation plan, matched framework skills, architecture docs, and trace source BRD-OBJ-* -> REQ-* -> AC-*.
2. Define architecture:
   • Name bounded contexts and module owners.
   • Define dependency direction and component RACI.
   • Choose sync, async, or hybrid communication.
   • Record data ownership and migration needs.
   • Define early mock/schema contracts so frontend, mobile, and backend can start in parallel; draw a container diagram plus one sequence per complex flow via common-architecture-diagramming (evidence cites the SRS or system-design doc, metric from NFR thresholds).
3. Define contracts:
   • Functional flows (FRS): user/system steps, inputs/outputs, validations, and error states.
   • For complex flows, use one actor, one goal, one session; split normal course from alternatives and exceptions.
   • Requirement cards: statement, priority, status, source, behavior, NFRs, measurement, and verification lane.
   • API inputs/outputs and interface contracts (OpenAPI/Protobuf).
   • Events/jobs and async guarantees (at-least-once, idempotent).
   • Storage shape, ownership, retention, and migration rules.
   • Security, permission, and privacy checks.
   • NFR thresholds for performance, reliability, and scalability.
4. Plan verification:
   • Unit, integration, E2E, visual, mobile, security, and migration checks.
   • Failure mode analysis for dependencies, fallbacks, retries, and rollback/degradation.
   • Save technical requirements to docs/srs/srs-[slug].md when file writes are allowed.
   • Record evidence in docs/srs/srs-walkthrough.md.
5. Record ADR:
   • Write one concise ADR when architecture or public contract changes.
   • Continue when patterns are inferable; return BLOCKED for cross-team contracts, migrations, permissions, or NFR uncertainty.
   • Route next step to implementation-readiness or dev-fix.

Runtime Contract

• Use after PRD or when implementation is approved but architecture and contracts are not explicit.
• Required inputs: PRD or ticket plus enough context to define contracts and verification.
• Return BLOCKED only for cross-team contracts, migrations, permissions, or NFR uncertainty.

Handoff Payload

• slug, SRS path, requirement trace, architecture decisions, diagram paths, contracts, data/migration plan, NFR thresholds, verification matrix, ADR, outcome report, next workflow.

Blocking Questions

• Ask max 3 at a time with a recommended default and 2-3 options.

Output Template

# Technical Design (SRS/FRS): [Name]
## Context
## Requirement Trace (BRD -> PRD -> SRS)
## Architecture & RACI
## Diagrams (Container / Sequence)
## Functional Flows (FRS)
## Parallel Readiness (Mocks/Schemes)
## Requirement Cards
## Contracts (API/Events)
## Data And Migration
## NFR Thresholds & Measurement
## Security And Privacy
## Failure Mode Analysis (FMA)
## Verification Plan & Evidence Matrix
## ADR

## Outcome Report
feature_status: design_ready | blocked
requirement_trace: BRD-OBJ-* -> REQ-* -> AC-* -> SRS-*
completed_evidence: []; missing_evidence: []; decision_needed: []; recommended_next_workflow: implementation-readiness

## Next Workflow
implementation-readiness | dev-fix
## Cost Report
Call `get_session_cost(workflow="design-solution")` before final handoff.