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Readme

Dflow

Dflow is a spec-first workflow kit for AI-assisted software development. It gives your AI coding agent a concrete process for turning change requests into structured specs, domain language, implementation plans, drift checks, and reviewable code instead of jumping straight from prompt to code.

AI makes delivery faster, but it also makes ambiguous domain knowledge more dangerous. Dflow uses DDD ideas such as ubiquitous language, bounded contexts, domain rules, and model ownership as the semantic backbone of SDD, so the AI has constraints before it generates code. The goal is not ceremony for its own sake; the goal is repeatable software change with clearer meaning, fewer scattered rules, and less prompt-dependent behavior.

Key Features

Feature	What it gives engineering teams
Spec-first development	Every meaningful change starts from an explicit spec, acceptance behavior, and implementation plan before code changes begin.
Greenfield and Brownfield tracks	Start clean in a new project, or introduce Dflow into an existing codebase through progressive domain extraction and safer incremental change.
Hybrid workflow control	Command-first entry points for intentional work, auto-trigger checks as a safety net, and transparent phase gates so developers stay in control.
DDD semantic backbone	Captures domain language, context boundaries, business rules, and model decisions so AI output is constrained by project meaning.
Three-layer documentation model	Keeps short-lived phase deltas, feature snapshots, and system-level state separate, so specs stay useful instead of becoming one large document dump.
Drift verification	Checks whether specs, domain documents, implementation, tests, and technical debt records still describe the same system.

Get Started

Run Dflow from the root of the project you want to adopt it in:

npx dflow-sdd-ddd init

The init flow asks whether the project is greenfield or brownfield, then previews the files it will create. Existing files are not overwritten.

For a fixed global CLI:

npm install -g dflow-sdd-ddd
dflow init

If the project is already initialized and you later add another AI coding tool, run:

dflow configure-agents

This command only configures AI instruction files. It does not rerun project initialization or touch existing specs.

After init, start work through the Dflow workflow in your AI coding agent:

/dflow:new-feature
/dflow:modify-existing
/dflow:bug-fix
/dflow:new-phase
/dflow:finish-feature
/dflow:verify
/dflow:pr-review

If your tool does not support custom slash commands, use the same command names as plain instructions in chat. Dflow is Markdown-based workflow material plus a scaffolding CLI, so it can be used with AI coding agents that can read project instructions and repository context.

Project Tracks

Track	Use it when	Main outcome
Greenfield	You are starting a new system or a new bounded area with room to shape architecture and domain model early.	Clean spec baseline, domain model ownership, feature-by-feature implementation through SDD.
Brownfield	You are adding or changing behavior in an existing codebase where business rules may already be scattered.	Progressive domain extraction, safer change planning, and migration-ready domain knowledge.

These tracks describe adoption style, not framework branding. Dflow should be read as a workflow system for software teams that want AI assistance without giving up domain clarity.

Workflow Model

Dflow uses a hybrid design:

Layer	Purpose
Command-first entry	Developers intentionally start work with commands such as `/dflow:new-feature` or `/dflow:modify-existing`.
Auto-trigger safety net	When the conversation clearly implies a feature, phase, bug fix, verification, or review, the AI should suggest the matching Dflow flow.
Transparency gates	The AI announces flow entry, phase transitions, and important internal steps so the developer can approve direction before work expands.

Dflow also scales ceremony by change risk:

Tier	Typical use	Expected weight
T1 Lightweight	Small bug fixes or narrow edits.	Minimal spec, focused verification.
T2 Standard	Normal feature work.	Feature spec, behavior examples, implementation plan, finish checks.
T3 Full	Cross-cutting changes, new bounded contexts, risky architecture work.	Full domain modeling, phase planning, broader drift verification, stronger review gates.

The transparency gates and T1/T2/T3 tiers are related but separate: transparency controls how the AI communicates the workflow; tiers control how much specification and verification the change needs.

Documentation Model

Dflow separates documents by lifecycle:

Layer	Shape	Purpose
Phase Delta	Short-lived phase spec.	Captures what this phase changes, why, and how it will be verified.
Feature Snapshot	Feature-level summary and behavior.	Preserves the accepted behavior and implementation decisions after phases complete.
System State	Shared domain and architecture documents.	Maintains durable knowledge such as glossary, context map, rules, models, conventions, and technical debt.

This keeps AI collaboration grounded. The phase layer gives the agent immediate execution context, the feature layer records what was delivered, and the system layer becomes the long-term source of truth for future prompts and reviews.

Files Created by Init

A typical initialized project receives a dflow/ workspace:

dflow/
  specs/
    shared/
      _overview.md
      _conventions.md
      Git-principles-*.md
    domain/
      glossary.md
      context-map.md
    architecture/
      tech-debt.md
    features/
      active/
      completed/

Dflow also creates or provides a mergeable project instruction file for your AI coding agent. The exact file depends on the target tool and existing project setup; Dflow avoids overwriting existing project instructions.

When you select AI agent setup during init, Dflow writes dflow/specs/shared/AI-AGENT-GUIDE.md as the canonical project guide, then creates small tool-specific shims that point back to it:

Tool target	Generated file
Codex / Copilot coding agent	`AGENTS.md`
Claude Code	`CLAUDE.md`
Gemini CLI	`GEMINI.md`
GitHub Copilot	`.github/copilot-instructions.md`

If one of those files already exists, Dflow leaves it unchanged and writes a merge snippet under dflow/specs/shared/ instead. The project guide stays the single source of truth, so teams can use multiple AI tools without maintaining multiple copies of the workflow rules.

You can run dflow configure-agents later to add more tool shims as the team adopts additional AI coding agents.

Main Flows

Flow	When to use it	Typical outputs
`/dflow:new-feature`	A new user-visible capability or business behavior.	Feature spec, behavior examples, phase plan, domain updates.
`/dflow:modify-existing`	A change to behavior already present in the system.	Impact analysis, updated specs, adjusted domain rules, migration notes when needed.
`/dflow:bug-fix`	A defect where expected behavior can be stated narrowly.	Lightweight spec, reproduction, fix plan, regression check.
`/dflow:new-phase`	A feature needs another implementation slice.	Phase delta, acceptance checks, focused implementation plan.
`/dflow:finish-feature`	The implementation is done and needs closure.	Drift verification, feature snapshot, technical debt update, review checklist.
`/dflow:verify`	You need confidence that docs and code still match.	Drift report across spec, domain docs, implementation, tests, and debt records.
`/dflow:pr-review`	A change is ready for review.	SDD/DDD compliance review with risks, gaps, and follow-up items.

Why DDD Matters More with AI

AI agents are strong at filling gaps. That is useful when the missing detail is mechanical, but risky when the missing detail is business meaning. If a prompt does not define the language, boundaries, and allowed behavior, the model may invent plausible rules that are hard to notice in review.

Dflow treats DDD as the semantic structure behind the spec. Ubiquitous language keeps names consistent. Bounded contexts keep meanings from leaking across areas. Domain rules define what is correct, allowed, or forbidden before implementation starts.

In a code-first workflow, design often appears after the fact in classes, handlers, and tests. In an AI-assisted workflow, the spec must become the precondition for generation. The practical flow becomes:

Domain meaning -> Structured spec -> AI implementation -> Code as output

For a longer explanation, see Why DDD Matters More with AI.

Repository Layout

Path	Purpose
`bin/`	CLI entrypoint.
`lib/`	Init runtime implementation.
`templates/`	Files copied by the init command.
`test/`	Smoke tests for generated output.
`tutorial/`	Guided learning scenarios and expected outputs.
`sdd-ddd-*-skill/`	Source workflow material consumed by AI coding agents.

Status

Dflow is currently published as dflow-sdd-ddd on npm. Version 0.1.0 focuses on project initialization, workflow documentation, and AI-agent-readable SDD/DDD guidance. Additional packaging for specific AI tools can be layered on top without changing the core workflow model.

License

MIT License. See LICENSE.