design

design is a command for Claude Code from XRenSiu/claude-code-forge. It costs 24 tokens per session (709 once invoked), scanned A, original, MIT.

A system-architecture design command that turns an approved product requirements document into technical specifications. It examines the existing codebase and produces architecture documents, decision records, and Mermaid diagrams, which are text-based architecture diagrams.

In plain words
What is it for?
Use it to design components and data flow, focus on an area such as an API or data layer, document constraints, or extend existing architecture documentation.
Why use it?
It connects product requirements to the technical structure needed to implement them. Recording important technical decisions also makes the reasoning and constraints easier to review later.

Command for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the pdforge plugin — 10 skills, 13 commands, 5 agents, 2 hooks shipped together

Good fit Use it to design components and data flow, focus on an area such as an API or data layer, document constraints, or extend existing architecture documentation.

Compare 6 commands from other repositories ↓
Install with agentmods
npx agentmods add commands/xrensiu/claude-code-forge/design
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/XRenSiu/claude-code-forge

Made for: Claude Code.

Or install pdforge, the plugin that ships this one along with the rest of its 10 skills, 13 commands, 5 agents, 2 hooks.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for design

README.md
[![agentmods](https://agentmods.dev/badge/commands/xrensiu/claude-code-forge/design/github.svg)](https://agentmods.dev/commands/xrensiu/claude-code-forge/design)
Your own site
<a href="https://agentmods.dev/commands/xrensiu/claude-code-forge/design"><img src="https://agentmods.dev/badge/commands/xrensiu/claude-code-forge/design/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for design

Your own site · 80×15
<a href="https://agentmods.dev/commands/xrensiu/claude-code-forge/design"><img src="https://agentmods.dev/badge/commands/xrensiu/claude-code-forge/design.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 24 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 709 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00024 $0.00709
Opus 5.5 $0.00010 $0.00284
Sonnet 5.5 $0.00005 $0.00142
Haiku 4.5 $0.00002 $0.00071

Measured 1mo ago against content hash 1ebec1209356, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

design scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/pdforge/commands/design.md · 108 lines

How it starts

The opening of the file, as written. The whole thing — 108 lines — stays where its author put it; the contents beside it link to each section on GitHub.

/design Command

Invoke the architect agent to create comprehensive system design documentation.

Usage

# Basic usage with PRD path
/design docs/prd/auth-feature.md

# With specific focus area
/design docs/prd/auth-feature.md --focus "API design"

# With constraints
/design docs/prd/auth-feature.md --constraints "PostgreSQL only, 2 week timeline"

# With existing architecture reference
/design docs/prd/auth-feature.md --existing docs/architecture/system.md

Parameters

Parameter Required Description
prd_path ✅ Path to the approved PRD document
--focus ❌ Specific area to focus on (e.g., "data layer", "security")
--constraints ❌ Technical constraints to consider
--existing ❌ Path to existing architecture documentation
--output ❌ Custom output path (default: docs/architecture/)

What It Does

  1. Reads the PRD and extracts technical requirements
  2. Analyzes existing codebase for integration points
  3. Designs system architecture with components and data flow
  4. Creates ADRs for significant technical decisions
  5. Generates diagrams (Mermaid format)
  6. Outputs design document to docs/architecture/[feature]-design.md

Output Structure

docs/
├── architecture/
│   └── [feature]-design.md    # Main design document
├── adr/
│   ├── [number]-[title].md    # Architecture Decision Records
│   └── ...
└── diagrams/
    └── [feature].mermaid      # Architecture diagrams

Example

# User has completed PRD for user authentication
/design docs/prd/user-authentication.md

# Output:
# ✅ Created docs/architecture/user-authentication-design.md
# ✅ Created docs/adr/001-jwt-vs-session.md
# ✅ Created docs/adr/002-password-hashing.md
# ✅ Created docs/diagrams/user-authentication.mermaid

Pre-requisites

  • ✅ PRD must be approved (reviewed and signed off)
  • ✅ PRD should contain clear functional and non-functional requirements

Read the full file on GitHub · 108 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 1mo ago First seen · 108 lines · 24 tokens per session scan A 1ebec1209356

Subscribe to this mod's changes

design is a command published in the GitHub repository XRenSiu/claude-code-forge (2 stars, last pushed 29d ago), licensed MIT. It adds 24 tokens to every session and 709 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-05.