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Modularity

Name: Modularity (Claude Skill)
Author: vladikk

Translates functional requirements into module boundaries using DDD heuristics — bounded contexts, aggregates, integration patterns.

Vladik Khononov's plugin operationalizes the heuristics from his book on bounded contexts. Feed it requirements; it proposes contexts, aggregates, and integration relationships, with rationale.

▶ Watch demo 📦 Install 💡 Use Cases

Why use it

Key features

Identifies bounded contexts
Aggregate-root proposals
Integration relationship suggestions (customer-supplier, ACL, OHS)
Rationale per decision
DDD-aligned vocabulary

Live Demo

What it looks like in practice

ready

Install

Author repository · Claude Skills documentation

Use Cases

Real-world ways to use Modularity

Carve up a greenfield service into modules

👤 Claude Code users ⏱ ~15 min intermediate

When to use: You're sketching a new system and want to avoid a distributed monolith.

Flow

Brief

Provide functional requirements + non-functional priorities.✓ Copied

→ Skill asks clarifying questions
Receive design

Module map with contexts + aggregates + integration patterns.✓ Copied

→ Diagrams + rationale
Iterate

Push back on weak boundaries; refine.✓ Copied

→ Approved decomposition

Outcome: Defensible module boundaries before code is written.

Combinations

Pair with other MCPs for X10 leverage

modularity-skill + drawio-mcp

Visualize the proposed module map

Combine modularity-skill with drawio-mcp: Visualize the proposed module map✓ Copied

Tools

What this MCP exposes

Tool	Inputs	When to call	Cost
design / critique	(see docs)	Two main flows	1 call

Cost & Limits

What this costs to run

API quota: N/A
Tokens per call: Mid
Monetary: Free
Tip: Treat output as a starting point — author intends it to be argued with

Security

Permissions, secrets, blast radius

Credential storage: None

Data egress: None

Troubleshooting

Common errors and fixes

Output too academic

Ask for "concrete service names + database boundaries"

Alternatives

Modularity vs others

Alternative	When to use it instead	Tradeoff
Hand-rolled	You already know your domain cold	No structured second opinion

Resources

📖 Read the official README on GitHub

🐙 Browse open issues

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