sdd-template

sdd-template is a skill for Claude Code, Codex from jsegov/shipspec-claude-code-plugin. It costs 54 tokens per session (1,213 once invoked), scanned A, original, MIT.

A template for a Software Design Document, a technical plan that explains a system’s purpose, architecture, decisions, detailed components, and supporting information.

In plain words
What is it for?
It is for creating system designs, architecture documents, technical specifications, or API plans from an approved product requirements document.
Why use it?
It gives technical design work a consistent eight-part structure and makes assumptions, risks, interfaces, and terminology easier to review.

Skill for Claude CodeCodex

Part of the shipspec plugin — 6 skills, 5 commands, 6 agents, 1 hook shipped together

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.

agentmods
npx agentmods add skills/jsegov/shipspec-claude-code-plugin/sdd-template
Any agent
npx skills add jsegov/shipspec-claude-code-plugin --skill sdd-template
Clone the repo
git clone --depth 1 https://github.com/jsegov/shipspec-claude-code-plugin

Made for: Claude Code, Codex.

Or install shipspec, the plugin that ships this one along with the rest of its 6 skills, 5 commands, 6 agents, 1 hook.

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 sdd-template

README.md
[![agentmods](https://agentmods.dev/badge/skills/jsegov/shipspec-claude-code-plugin/sdd-template.svg)](https://agentmods.dev/skills/jsegov/shipspec-claude-code-plugin/sdd-template)
Your own site
<a href="https://agentmods.dev/skills/jsegov/shipspec-claude-code-plugin/sdd-template"><img src="https://agentmods.dev/badge/skills/jsegov/shipspec-claude-code-plugin/sdd-template.svg" alt="Measured on agentmods" height="20"></a>
Per session 54 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,213 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00054 $0.01213
Opus 5 $0.00027 $0.00607
Sonnet 5 $0.00011 $0.00243
Haiku 4.5 $0.00005 $0.00121

Measured 4d ago against content hash aefed8bf2cb9, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

sdd-template 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 4d 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.

skills/sdd-template/SKILL.md · 214 lines

How it starts

The opening of the file, as written. The whole thing — 214 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Software Design Document Template

Create comprehensive technical design documents following the Atlassian 8-section structure.

Document Structure Overview

Section Purpose
1. Introduction Purpose, scope, definitions
2. System Overview High-level architecture
3. Design Considerations Assumptions, constraints, risks
4. Architectural Strategies Key decisions and alternatives
5. System Architecture Components, data flow, APIs, models
6. Policies and Tactics Security, error handling, logging
7. Detailed Design Component-level specifications
8. Appendix Diagrams, glossary

Section Templates

Section 1: Introduction

## 1. Introduction

### 1.1 Purpose
[What this document covers and its intended audience]

### 1.2 Scope
[System boundaries - what's included and excluded]

### 1.3 Definitions and Acronyms
| Term | Definition |
|------|------------|
| [Term] | [Definition] |

### 1.4 References
- PRD: [link to PRD document]
- [Other relevant documents]

Section 2: System Overview

## 2. System Overview

### 2.1 System Context
[How this system fits into the broader architecture]

### 2.2 High-Level Architecture
[Architecture diagram description or ASCII diagram]

### 2.3 Key Components
- **Component A**: [Purpose and responsibility]
- **Component B**: [Purpose and responsibility]

Section 3: Design Considerations

## 3. Design Considerations

### 3.1 Assumptions
- [Assumption 1]
- [Assumption 2]

### 3.2 Constraints
- [Technical constraint]
- [Business constraint]

### 3.3 Dependencies
- [External system X]
- [Library Y version Z]

### 3.4 Risks
| Risk | Impact | Mitigation |
|------|--------|------------|
| [Risk] | High/Med/Low | [Strategy] |

Section 4: Architectural Strategies

## 4. Architectural Strategies

### 4.1 Strategy Selection
[Why this architecture was chosen over alternatives]

### 4.2 Alternatives Considered
| Option | Pros | Cons | Decision |
|--------|------|------|----------|
| [Option A] | [Pros] | [Cons] | Selected |
| [Option B] | [Pros] | [Cons] | Rejected |

### 4.3 Key Architectural Decisions
- **Decision 1**: [Decision and rationale]
- **Decision 2**: [Decision and rationale]

Read the full file on GitHub · 214 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 4d ago First seen · 214 lines · 54 tokens per session scan A aefed8bf2cb9

Subscribe to this mod's changes

sdd-template is a skill published in the GitHub repository jsegov/shipspec-claude-code-plugin (20 stars, last pushed 7mo ago), licensed MIT. It adds 54 tokens to every session and 1,213 once invoked, about $0.0003 per session on Opus 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 2026-08-30.