Sdd

Comprehensive specification-driven development workflow plugin that transforms prompts into production-ready implementations through structured planning, architecture design, and quality-gated execution.

This plugin is designed to consistently and reproducibly produce working code. It was tested on real-life production projects by our team, and in 100% of cases it generated working code aligned with the initial prompt. If you find a use case it cannot handle, please report it as an issue.

Key Features

• Development as compilation — The plugin functions like a "compilation" or "nightly build" for your development process: task specs → run /implement-task → working code. After writing your prompt, you can launch the plugin and expect a functional result when you return. The completion time depends on task complexity — simple tasks may finish within 30 minutes, while complex ones can take several days.
• Benchmark-level quality in real life — Model benchmarks improve with each release, yet real-world results often stagnate. This is because benchmarks reflect the best possible output a model can achieve, whereas in practice LLMs tend to drift toward sub-optimal, non-functional solutions. This plugin uses a variety of patterns to keep the model operating at peak performance.
• Customizable — Balance result quality and process speed by adjusting command parameters. Learn more in the Customization section.
• Developer time-efficiency — The overall process is designed to minimize developer time and reduce the number of interactions, while still producing results superior to what a model can generate from scratch. However, overall quality is proportional to the time invested in iterating on and refining the specification.
• Industry-standard — The plugin's specification template is based on the arc42 standard, adjusted for LLM capabilities. Arc42 is a widely adopted, high-quality standard for software development documentation used by many organizations.
• Works best in complex or large codebases — While most other frameworks work best for new projects and greenfield development, this plugin is designed to perform better as your codebase grows and your architecture becomes more structured. Each planning phase includes a codebase impact analysis step that evaluates which files may be affected and which patterns to follow to achieve the desired result.
• Simple — This plugin avoids unnecessary complexity by primarily using only three commands, offloading process complexity to the model via multi-agent orchestration. /implement-task is a single command that produces functional code from a task specification. To create that specification, you run /sdd:add-task and /plan-task, which analyze your prompt and iteratively refine the specification until it meets the required quality standards.

Quick Start

/plugin marketplace add NeoLabHQ/context-engineering-kit

Enable the sdd plugin in the installed plugins list:

/plugin
# Installed -> sdd -> Space to enable

Then run the following commands:

# Create the .specs/tasks/draft/design-auth-middleware.feature.md file with the initial prompt
/add-task "Design and implement authentication middleware with JWT support"

# Write a detailed specification for the task
/plan-task .specs/tasks/draft/design-auth-middleware.feature.md
# Moves the task to the .specs/tasks/todo/ folder

Run /clear (or re-open Claude Code) to clear context and start fresh. Then run the following command:

# Implement the task
/implement-task @.specs/tasks/todo/design-auth-middleware.feature.md
# Produces a working implementation and moves the task to the .specs/tasks/done/ folder

• Detailed guide
• Refining specifications and code
• Usage Examples