name	implement-plan-preflight
description	Execute Preflight phase for /itp:go workflow - create ADR (MADR 4.0), design spec from global plan, verify checkpoint. Use when creating ADRs, design specs, or when /itp:go invokes Preflight phase. Triggers - ADR creation, design spec, MADR format, preflight verification.

Implement Plan Preflight

Execute the Preflight phase of the /itp:go workflow. Creates ADR and Design Spec artifacts with proper cross-linking and verification.

When to Use This Skill

Invoked by /itp:go command during Preflight phase
User asks to create an ADR for a feature
User mentions "design spec" or "MADR format"
Manual preflight verification needed

Preflight Workflow Overview

P.1: Create Feature Branch (if -b flag)
         │
         ▼
P.2: Create ADR File (MADR 4.0)
         │
         ▼
P.3: Create Design Spec (from global plan)
         │
         ▼
P.4: Verify Checkpoint (MANDATORY)

CRITICAL: Do NOT proceed to Phase 1 implementation until ALL preflight steps are complete and verified.

Quick Reference

ADR ID Format

YYYY-MM-DD-slug

Example: 2025-12-01-clickhouse-aws-ohlcv-ingestion

File Locations

Artifact	Path
ADR	`/docs/adr/$ADR_ID.md`
Design Spec	`/docs/design/$ADR_ID/spec.md`
Global Plan	`~/.claude/plans/<adj-verb-noun>.md`

Cross-Links (MANDATORY)

In ADR header:

**Design Spec**: [Implementation Spec](/docs/design/YYYY-MM-DD-slug/spec.md)

In spec.md header:

**ADR**: [Feature Name ADR](/docs/adr/YYYY-MM-DD-slug.md)

Execution Steps

Step P.1: Create Feature Branch (Optional)

Only if -b flag specified. See Workflow Steps for details.

Step P.2: Create ADR File

Create /docs/adr/$ADR_ID.md
Use template from ADR Template
Populate frontmatter from session context
Select perspectives from Perspectives Taxonomy
Use Skill tool to invoke adr-graph-easy-architect for diagrams

Step P.3: Create Design Spec

Create folder: mkdir -p docs/design/$ADR_ID
Copy global plan: cp ~/.claude/plans/<adj-verb-noun>.md docs/design/$ADR_ID/spec.md
Add ADR backlink to spec header

Step P.4: Verify Checkpoint

Run validator or manual checklist:

uv run scripts/preflight_validator.py $ADR_ID

Checklist (ALL must be true):

ADR file exists at /docs/adr/$ADR_ID.md
ADR has YAML frontmatter with all 7 required fields
ADR has **Design Spec**: link in header
DIAGRAM CHECK 1: ADR has Before/After diagram (Context section)
DIAGRAM CHECK 2: ADR has Architecture diagram (Architecture section)
Design spec exists at /docs/design/$ADR_ID/spec.md
Design spec has **ADR**: backlink in header

If any item is missing: Create it now. Do NOT proceed to Phase 1.

YAML Frontmatter Quick Reference

---
status: proposed
date: YYYY-MM-DD
decision-maker: [User Name]
consulted: [Agent-1, Agent-2]
research-method: single-agent
clarification-iterations: N
perspectives: [Perspective1, Perspective2]
---

See ADR Template for full field descriptions.

Diagram Requirements (2 DIAGRAMS REQUIRED)

⛔ MANDATORY: Every ADR must include EXACTLY 2 diagrams:

Diagram	Location	Purpose
Before/After	Context section	Shows system state change
Architecture	Architecture section	Shows component relationships

SKILL INVOCATION: Invoke adr-graph-easy-architect skill NOW to create BOTH diagrams.

BLOCKING GATE: Do NOT proceed to design spec until BOTH diagrams are embedded in ADR.

Reference Documentation

ADR Template - Complete MADR 4.0 template
Perspectives Taxonomy - 11 perspective types
Workflow Steps - Detailed step-by-step guide

Validation Script

# Verify preflight artifacts
uv run scripts/preflight_validator.py <adr-id>

# Example
uv run scripts/preflight_validator.py 2025-12-01-my-feature

implement-plan-preflight

Install Skill

SKILL.md