Arc-Kit

Phase 5: Define Requirements

/arckit:requirements → Document comprehensive requirements

Create detailed requirements informed by stakeholder goals (if SOBC approved):

• Business requirements with rationale
• Functional requirements with acceptance criteria
• Non-functional requirements (performance, security, scalability, compliance)
• Integration requirements (upstream/downstream systems)
• Data requirements (DR-xxx)
• Success criteria and KPIs

Installation

Claude Code (premier experience) — install the ArcKit plugin (requires v2.1.172+):

First, make sure Claude Code is on the latest version:

claude install latest

Then in Claude Code:

/plugin marketplace add tractorjuice/arc-kit

Then install from the Discover tab. The marketplace ships 13 plugins — install only the jurisdictions you need:

```bash

Install with pip

pip install git+https://github.com/tractorjuice/arc-kit.git

Install with pip

pip install git+https://github.com/tractorjuice/arc-kit.git

Or run without installing

uvx --from git+https://github.com/tractorjuice/arc-kit.git arckit init my-project

**Mistral Vibe CLI** — link the ArcKit extension:

Minimal install (skip docs and guides)

arckit init payment-modernization --ai codex --minimal

Quick Start

Explore Example Outputs

Public demonstration repositories showcase complete ArcKit deliverables:

• NHS Appointment Booking — arckit-test-project-v7-nhs-appointment: Digital health platform with NHS Spine integration and GDPR safeguards.
• M365 GCC-H Migration — arckit-test-project-v1-m365: Government cloud migration with compliance mapping and change management.
• HMRC Tax Assistant — arckit-test-project-v2-hmrc-chatbot: Conversational AI service covering PII protection and bilingual support.
• Windows 11 Deployment — arckit-test-project-v3-windows11: Enterprise OS rollout with policy migration and security baselines.
• Patent Application System — arckit-test-project-v6-patent-system: Intellectual property workflow automation using GOV.UK Pay and Notify.
• ONS Data Platform — arckit-test-project-v8-ons-data-platform: Official statistics analytics environment with Five Safes governance.
• Cabinet Office GenAI Platform — arckit-test-project-v9-cabinet-office-genai: Cross-government GenAI platform with responsible AI guardrails.
• UK Government Training Marketplace — arckit-test-project-v10-training-marketplace: AI training procurement platform with multi-sided marketplace design.
• National Highways Data Architecture — arckit-test-project-v11-national-highways-data: Strategic road network data platform modernization.
• Scottish Courts GenAI — arckit-test-project-v14-scottish-courts: Scottish Courts and Tribunals Service GenAI strategy with comprehensive MLOps and FinOps.
• Doctors Appointment System — arckit-test-project-v16-doctors-appointment: Online appointment booking system with NHS integration.
• UK Fuel Price Transparency — arckit-test-project-v17-fuel-prices: UK Government fuel price transparency service with real-time pricing data.
• Smart Meter Consumer App — arckit-test-project-v18-smart-meter: UK Smart Meter data consumer mobile app with DCC/SMIP integration.
• UK Government API Aggregator — arckit-test-project-v19-gov-api-aggregator: Unified access to 240+ UK Government APIs across 34+ departments.

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Phase 5.3: Platform Strategy Design (Optional - for Multi-Sided Platforms)

/arckit:platform-design → Design multi-sided platform strategy using Platform Design Toolkit

Use this phase when designing ecosystem-based platforms (Government as a Platform, marketplaces, data platforms):

• Ecosystem Canvas: Map supply side, demand side, supporting entities with relationship diagrams
• Entity-Role Portraits: Deep dive into 3-5 key entities (context, pressures, goals, gains)
• Motivations Matrix: Identify synergies and conflicts across entities with mitigation strategies
• Transactions Board: Design 10-20 transactions with cost reduction analysis (search, information, negotiation, coordination, enforcement)
• Learning Engine Canvas: 5+ services that help participants improve (data, feedback loops, network effects)
• Platform Experience Canvas: Journey maps with business model and unit economics
• MVP Canvas: Liquidity bootstrapping strategy to solve chicken-and-egg problem
• Platform Design Canvas: Synthesize all 8 canvases into cohesive platform strategy
• UK Government Context: Aligns with Government as a Platform (GaaP), TCoP Point 8 (share/reuse), Digital Marketplace

Use Cases: NHS appointment booking, local authority data marketplaces, training procurement platforms, citizen services portals

Step 1: Upgrade the CLI tool

pip install --upgrade git+https://github.com/tractorjuice/arc-kit.git

Clone the standalone extension repository

git clone https://github.com/tractorjuice/arckit-vibe.git cd arckit-vibe

Create extensions directory and link

mkdir -p ~/.vibe/extensions/ ln -s $(pwd) ~/.vibe/extensions/arckit ```

Zero-config: 75 official commands as skills, 10 specialized agents, all templates, and bundled MCP servers (AWS Knowledge, Microsoft Learn, Google Developer Knowledge, GovRepoScrape).

Latest Release: v5.15.0

What it costs (plugin footprint)

Token cost of installing the arckit core plugin in a Claude Code session, captured from claude plugin details arckit on v2.1.143+:

• Always-on per session: ~10,042 tokens — added to every session's system context, covering the 73 command-skills + 5 utility skills (architecture-workflow, arckit-build, mermaid-syntax, plantuml-syntax, wardley-mapping) + 16 agent descriptors. Hooks (9 events) and MCP servers (6) are harness-resolved at runtime and not counted.
• On-invoke: ~250 to ~60K tokens per command — paid only when a specific skill or agent fires. Most commands are in the 5–10K range.

The ArcKit Workflow

ArcKit guides you through the enterprise architecture lifecycle:

GitHub Copilot (VS Code)

cd payment-modernization && code .