GitHub - jyjeanne/rustyspec: A Rust CLI SDD tool that transforms feature descriptions into structured specs, plans, and tasks — then lets your AI agent build them

Specification-Driven Development for the AI era

A Rust CLI that transforms feature descriptions into structured specs, plans, and tasks — then lets your AI agent build them.

Install • Workflow • Claude Code • Mistral Vibe • Copilot • Use Cases • Commands

The Problem

You describe a feature to your AI coding agent. It generates code. But the code doesn't match what you actually needed — scope creeps, edge cases are missed, and there's no traceability from requirements to implementation.

RustySpec fixes this by inserting a structured specification layer between your idea and the code. Every feature gets a spec, a plan, and a task list — all versioned in your repo, all driving the AI's implementation.

The 8-Step Workflow

                    You describe a feature
                            |
                            v
  +----------------------------------------------------------+
  |                                                          |
  |   1. rustyspec specify   -->  spec.md                     |
  |   2. rustyspec clarify   -->  clarifications.md           |
  |   3. rustyspec plan      -->  plan.md + research +        |
  |                               data-model + contracts      |
  |   4. rustyspec tasks     -->  tasks.md (phased, parallel) |
  |   5. rustyspec tests     -->  test scaffolds (per story)  |
  |   6. rustyspec implement -->  AI builds from tasks        |
  |   7. rustyspec analyze   -->  consistency report          |
  |   8. rustyspec review    -->  quality review report       |
  |                                                           |
  |   Or run all at once: rustyspec pipeline --new "feature"  |
  |                                                          |
  +----------------------------------------------------------+
                            |
                            v
                  Working, traced code

Every artifact references the one before it. Requirements trace to plan sections. Plan sections trace to tasks. Nothing gets lost.

Install

Build from source

git clone https://github.com/jyjeanne/rustyspec.git
cd rustyspec
cargo build --release

The compiled binary is placed at target/release/rustyspec (Linux/macOS) or target\release\rustyspec.exe (Windows).

Add to PATH — Linux / macOS

Option A — copy to a system directory (recommended)

sudo cp target/release/rustyspec /usr/local/bin/rustyspec

Option B — add the build output directory to your shell profile

# Bash (~/.bashrc or ~/.bash_profile)
echo 'export PATH="$PATH:$HOME/rustyspec/target/release"' >> ~/.bashrc
source ~/.bashrc

# Zsh (~/.zshrc)
echo 'export PATH="$PATH:$HOME/rustyspec/target/release"' >> ~/.zshrc
source ~/.zshrc

Replace $HOME/rustyspec with the actual path where you cloned the repository.

Add to PATH — Windows

Option A — copy to a permanent directory, then add it to the system PATH (recommended)

# 1. Create a directory for CLI tools (skip if it already exists)
New-Item -ItemType Directory -Force -Path "$env:USERPROFILE\bin"

# 2. Copy the binary
Copy-Item .\target\release\rustyspec.exe "$env:USERPROFILE\bin\rustyspec.exe"

# 3. Add the directory to the permanent user PATH (takes effect in new shells)
[Environment]::SetEnvironmentVariable(
    "PATH",
    "$env:PATH;$env:USERPROFILE\bin",
    [EnvironmentVariableTarget]::User
)

Option B — add the build output directory to PATH for the current session only

$env:PATH += ";$(Get-Location)\target\release"

To make Option B permanent, add it to your PowerShell profile ($PROFILE):

Add-Content $PROFILE "`n`$env:PATH += `";C:\path\to\rustyspec\target\release`""

Verify the installation:

rustyspec --version
# rustyspec 0.1.0

Quick Start (5 minutes)

1. Initialize your project

mkdir my-app && cd my-app

# Create .claude/ or .vibe/ or .github/ directory for your agent
mkdir .claude

# Initialize RustySpec (auto-detects your AI agent)
rustyspec init --here

RustySpec creates:

.rustyspec/ — constitution, templates, config
specs/ — where feature artifacts live
rustyspec.toml — project configuration
.claude/commands/rustyspec-*.md — 9 slash commands for your agent

2. Describe your feature

rustyspec specify "TODO list with CRUD operations and local storage"

This creates specs/001-todo-list-crud/spec.md with:

Prioritized user stories (P1, P2, P3)
Functional requirements (FR-001, FR-002...)
Acceptance scenarios (Given/When/Then)
Quality checklist

3. Plan the architecture

rustyspec plan 001

Generates plan.md, research.md, data-model.md, quickstart.md, and contracts/.

4. Generate tasks

rustyspec tasks 001

Produces a phased task breakdown:

Phase 1: Setup
  - [ ] T001 Create project structure
  - [ ] T002 Initialize dependencies

Phase 2: Foundational
  - [ ] T003 Setup data models
  - [ ] T004 [P] Create Task model in src/models/task.rs

Phase 3: User Story 1 - Add a task (P1)
  - [ ] T005 [US1] Implement add task functionality
  - [ ] T006 [P] [US1] Add validation and error handling

Phase 4: User Story 2 - View tasks (P1)
  ...

5. Let your AI agent build it

Use the slash command in your AI agent:

/rustyspec-implement

Using with Claude Code

Claude Code gets 9 slash commands automatically registered in .claude/commands/.

Setup

# Ensure .claude/ exists (Claude Code creates it automatically)
mkdir -p .claude

# Initialize RustySpec
rustyspec init --here

You'll see:

Registered commands for 1 agent(s): claude

Available slash commands

Slash Command	What it does
`/rustyspec-specify`	Create a new feature spec from a description
`/rustyspec-clarify`	Resolve ambiguities in a spec
`/rustyspec-plan`	Generate architecture plan + supporting docs
`/rustyspec-tasks`	Generate phased task breakdown
`/rustyspec-implement`	Execute tasks from the breakdown
`/rustyspec-tests`	Generate and enhance test scaffolds
`/rustyspec-analyze`	Validate cross-artifact consistency
`/rustyspec-review`	Review spec quality with preflight heuristics
`/rustyspec-checklist`	Generate quality validation checklist

Step-by-step with Claude Code

Step 1 — Open your project in Claude Code and run:

/rustyspec-specify Simple TODO app with add, edit, delete, and local storage

Claude reads the AGENT.md context, creates a feature branch, and generates spec.md with structured user stories, requirements, and acceptance scenarios.

Step 2 — Review and refine the spec, then:

/rustyspec-plan

Claude generates the architecture plan, data model, API contracts, and research document. Constitution gates are checked automatically.

Step 3 — Generate tasks:

/rustyspec-tasks

Claude creates tasks.md with phased, parallelizable tasks linked to user stories.

Step 4 — Build it:

/rustyspec-implement

Claude reads the task list and implements each task in order, respecting dependencies and [P] parallel markers. Completed tasks are marked [X].

Step 5 — Validate:

/rustyspec-analyze

Claude checks that all requirements trace to plan sections, all plan sections trace to tasks, and the constitution is respected.

Using with Mistral Vibe

Mistral Vibe gets 9 skills registered as directories in .vibe/skills/. Each skill has a SKILL.md with the user-invocable: true frontmatter so it appears in Vibe's slash command list.

Setup

mkdir -p .vibe
rustyspec init --here

You'll see:

Registered commands for 1 agent(s): vibe

Skills are created at:

.vibe/skills/
  rustyspec-specify/SKILL.md
  rustyspec-clarify/SKILL.md
  rustyspec-plan/SKILL.md
  rustyspec-tasks/SKILL.md
  rustyspec-implement/SKILL.md
  rustyspec-tests/SKILL.md
  rustyspec-analyze/SKILL.md
  rustyspec-review/SKILL.md
  rustyspec-checklist/SKILL.md

Step-by-step with Mistral Vibe

Step 1 — In Vibe, run:

/rustyspec-specify Real-time chat with message history and user presence

Vibe generates a structured spec with prioritized user stories and quality checklist.

Step 2 — Generate the plan:

/rustyspec-plan

Vibe creates the architecture plan with constitution compliance checks, data model, and API contracts.

Step 3 — Break it into tasks:

/rustyspec-tasks

Step 4 — Implement:

/rustyspec-implement

Vibe reads tasks.md and builds each task, marking them complete as it goes.

Step 5 — Quality check:

/rustyspec-analyze

Using with GitHub Copilot

Copilot gets .agent.md command files in .github/agents/ with companion .prompt.md files in .github/prompts/.

Setup

mkdir -p .github
rustyspec init --here

You'll see:

Registered commands for 1 agent(s): copilot

How it works

Copilot commands are registered as:

.github/agents/rustyspec-specify.agent.md
.github/agents/rustyspec-plan.agent.md
.github/agents/rustyspec-tasks.agent.md
.github/agents/rustyspec-implement.agent.md
etc.

Each also gets a companion .github/prompts/rustyspec-*.prompt.md.

Step-by-step with Copilot

The workflow is the same as Claude Code — use the slash commands:

/rustyspec-specify E-commerce cart with checkout and payment
/rustyspec-plan
/rustyspec-tasks
/rustyspec-implement
/rustyspec-analyze

Using Multiple Agents Together

RustySpec registers commands for all detected agents simultaneously. If your project has both .claude/ and .vibe/:

mkdir .claude .vibe
rustyspec init --here
# Registered commands for 2 agent(s): claude, vibe

Both agents get the same commands and work from the same spec artifacts. You can:

Use Claude Code for specification and planning
Switch to Vibe for implementation
Use either for analysis
Or automate everything with rustyspec pipeline — assign agents per phase in rustyspec.toml

The artifacts in specs/ are agent-agnostic — any agent can read and build from them.

Automated multi-agent pipeline

# Configure agent assignments in rustyspec.toml, then:
rustyspec pipeline --new "Todo list REST API" --auto

The pipeline invokes each agent's CLI automatically. Claude Code gets -p with --allowedTools, Vibe gets -p (auto-approve). Agents that don't have CLI support fall back to manual handoff.

Use Cases

Use Case 1: New project from scratch

You're starting a brand new project and want structured, AI-driven development from day one.

Scenario: You're building a personal finance tracker as a web app.

Step 1 — Create and initialize the project

mkdir finance-tracker && cd finance-tracker

# Set up your AI agent directory
mkdir .claude    # or .vibe, .github, etc.

# Initialize RustySpec
rustyspec init --here

Your project now has:

finance-tracker/
  .rustyspec/          # Constitution, templates, config
  .claude/commands/    # 7 slash commands for Claude Code
  specs/               # Empty — ready for features
  rustyspec.toml       # Project config
  .git/                # Git repo with initial commit

Step 2 — Specify your first feature

rustyspec specify "Dashboard showing income, expenses, and monthly balance with charts"

RustySpec creates a feature branch 001-dashboard-showing-income-expenses, generates spec.md with user stories, requirements, and a quality checklist. Edit the spec to refine it.

Step 3 — Plan and generate tasks

rustyspec plan 001
rustyspec tasks 001

You now have a full plan (architecture, data model, API contracts) and a phased task list ready for your AI agent.

Step 4 — Build with your AI agent

Open the project in Claude Code (or Vibe, Copilot, etc.) and run:

/rustyspec-implement

The agent reads the task list and builds each task in order. When done, validate:

/rustyspec-analyze

Step 5 — Add the next feature

rustyspec specify "Transaction import from CSV and bank API"

RustySpec auto-numbers it 002, creates a new branch, and the cycle repeats. Each feature is self-contained in its own specs/002-* directory.

Use Case 2: Adding RustySpec to an existing project

You have an existing codebase and want to use RustySpec for new features going forward.

Scenario: You have a Node.js API that's been running for 6 months. You want to add a notification system using structured SDD.

Step 1 — Initialize RustySpec in your existing repo

cd ~/projects/my-existing-api

# Create your AI agent directory if it doesn't exist
mkdir -p .claude

# Initialize RustySpec without overwriting anything
rustyspec init --here

RustySpec adds its own directories (.rustyspec/, specs/) without touching your existing code. Your .gitignore, package.json, src/, etc. are untouched.

my-existing-api/
  src/                 # Your existing code — untouched
  package.json         # Your existing config — untouched
  .rustyspec/          # NEW: RustySpec config + templates
  .claude/commands/    # NEW: 7 slash commands
  specs/               # NEW: empty, ready for features
  rustyspec.toml       # NEW: project config

Step 2 — Edit the constitution for your project

The default constitution assumes a greenfield project. For an existing project, edit .rustyspec/constitution.md to match your team's actual principles:

# Open and customize
$EDITOR .rustyspec/constitution.md

For example, you might:

Change "Library-First" to match your monorepo structure
Add your team's testing conventions
Reference your existing API patterns

Step 3 — Specify the new feature

rustyspec specify "Real-time notification system with email, push, and in-app channels"

RustySpec creates specs/001-real-time-notification-system/spec.md. Edit the spec to reference your existing codebase:

Mention existing models the notification system needs to integrate with
Reference your existing auth middleware
Note your current database and message queue setup

Step 4 — Plan with awareness of existing code

rustyspec plan 001

Edit plan.md to reference your existing architecture:

Point to existing services the new feature depends on
Reference your current test infrastructure
Note existing patterns to follow

Step 5 — Generate and execute tasks

rustyspec tasks 001

The task list includes a Foundational phase for integration points with your existing code. Use your AI agent:

/rustyspec-implement

The agent builds the notification system, following the plan that's aware of your existing codebase.

Step 6 — Continue with more features

rustyspec specify "User preference center for notification settings"
# Auto-numbered as 002, new branch, new spec

Each new feature follows the same structured workflow. Old code stays untouched, new features are fully specified and traced.

Key differences between new and existing projects

	New project	Existing project
Init	Creates project structure from scratch	Adds `.rustyspec/` and `specs/` alongside existing code
Constitution	Use defaults	Customize to match your team's existing patterns
Spec writing	Describe features freely	Reference existing models, APIs, and patterns
Plan	Greenfield architecture	Integration-aware, references existing services
Tasks	Full setup from scratch	Foundational phase focuses on integration points
Git	Clean history from first commit	Feature branches alongside your existing branches

Multi-Agent Pipeline

Run the entire SDD workflow with one command, using different AI agents per phase. The pipeline invokes each agent's CLI automatically to fill spec artifacts with real content — not just empty templates.

# rustyspec.toml
[pipeline]
specify = "claude"       # Claude writes specs
plan = "claude"          # Claude for architecture
tasks = "claude"         # Claude for task breakdown
tests = "claude"         # Claude for test generation
implement = "vibe"       # Mistral Vibe for code
analyze = "claude"       # Claude for cross-checking
review = "claude"        # Claude for quality review

# Full pipeline on a new feature (agents invoked automatically)
rustyspec pipeline --new "User auth with OAuth" --auto

# Partial pipeline
rustyspec pipeline 001 --from plan --to tasks

# Preview without executing
rustyspec pipeline 001 --dry-run

# Scaffold only — generate templates without invoking AI agents
rustyspec pipeline --new "Feature name" --no-agent

How it works

The pipeline runs 8 phases in order: specify → clarify → plan → tasks → tests → implement → analyze → review.

For each Auto phase (specify, clarify, plan, tasks, tests, analyze):

RustySpec generates the template scaffold (spec.md, plan.md, etc.)
RustySpec invokes the agent's CLI non-interactively with detailed, phase-specific instructions
The agent reads the scaffold and fills it with real content

The implement phase is always a handoff — it tells you which agent to open and waits for confirmation.

Execution modes

The pipeline detects agent CLI availability upfront and reports the mode:

Pipeline: 001-todo-api [fully automated]     # All agents have CLI support
Pipeline: 001-todo-api [mixed mode]          # Some need manual handoff
Pipeline: 001-todo-api [scaffold-only]       # --no-agent flag used

If an agent's CLI is not installed, the pipeline falls back to handoff mode for that phase (shows the manual command to run).

Supported agent CLI invocations

Agent	CLI Binary	Non-interactive Flag
Claude Code	`claude`	`-p` + `--allowedTools`
Mistral Vibe	`vibe`	`-p` (auto-approves tools)
Codex CLI	`codex`	`exec` subcommand
Copilot CLI	`copilot`	`-p` + `--allow-all-tools`
Kimi Code	`kimi`	`--yolo`
Cursor	`cursor-agent`	`-n`
Aider	`aider`	`-m`
Roo Code	`roo-code-cli`	`--headless`

A pipeline-log.md is generated in the feature directory with timestamps, agents, duration, and status per phase.

Real-world example

A pipeline test with Claude Code (specify/plan/tasks/tests/analyze) + Mistral Vibe (implement) on a "Todo List REST API" produced:

Phase	Agent	Duration	Output
specify	Claude	40s	5 user stories, 14 acceptance scenarios, 12 FRs
plan	Claude	95s	Node.js + Express + SQLite stack, API contracts
tasks	Claude	75s	20 tasks across 8 phases with FR references
tests	Claude	88s	5 test files with concrete assertions
implement	Vibe	manual	Full CRUD API, 22 passing integration tests

Total: ~5 minutes for automated phases, fully working API with tests.

Spec-to-Test Generation

Generate runnable test scaffolds from your spec's acceptance scenarios:

rustyspec tests 001
# Detected: Jest (JavaScript)
# Parsed: 6 acceptance scenarios from 4 user stories
# Generated: 4 test files

Auto-detects your test framework from project files (Jest, Vitest, pytest, cargo test, Go, generic). Each test has Given/When/Then comments and a failing body:

describe('US1: Add a new task', () => {
  test('task appears in list with pending status', () => {
    // Given: the app is open
    // When: user types a task title and clicks "Add"
    // Then: the task appears in the list with status "pending"
    throw new Error('TODO: implement this test');
  });
});

Override framework with --framework pytest, preview with --dry-run.

Generated Artifacts

For each feature, RustySpec generates a complete artifact tree:

specs/001-todo-list-crud/
  spec.md                  # User stories, requirements, acceptance criteria
  clarifications.md        # Decision log with session dates
  plan.md                  # Architecture plan with constitution gates
  research.md              # Technology investigation
  data-model.md            # Entity definitions and relationships
  quickstart.md            # Key validation scenarios
  contracts/               # API specifications
    api.md
  tasks.md                 # Phased task breakdown
  tests/                   # Test scaffolds from acceptance scenarios
    us1_add_task.test.js
    us2_view_tasks.test.js
  checklists/
    requirements.md        # Quality validation checklist
  pipeline-log.md          # Pipeline execution log (agents, timing, status)

All artifacts are Markdown. All are version-controlled. All trace back to the original spec.

Project Constitution

Every RustySpec project gets a constitution.md defining architectural principles:

Gate	What it checks
Simplicity	Max 3 projects, no speculative features
Anti-Abstraction	Use frameworks directly, no wrapper layers
Integration-First	Contract tests before implementation, real services over mocks

The plan command evaluates these gates automatically. Violations are reported but don't block — the plan is generated with warnings so you can decide how to proceed.

Template System

Templates control what gets generated. They follow a 4-layer priority hierarchy:

Priority	Location	Use case
1 (highest)	`.rustyspec/templates/overrides/`	Project-specific tweaks
2	`.rustyspec/presets/<id>/templates/`	Team workflow presets
3	`.rustyspec/extensions/<id>/templates/`	Extension templates
4 (lowest)	Embedded in binary	Defaults

Install a custom preset:

rustyspec preset add ./my-team-preset --priority 5

All Commands

Command	Description
`rustyspec init [name]`	Initialize project with constitution, templates, agent commands
`rustyspec specify <desc>`	Create feature spec with user stories and quality checklist
`rustyspec clarify [id]`	Resolve `[NEEDS CLARIFICATION]` markers
`rustyspec plan [id]`	Generate plan + research + data model + contracts
`rustyspec tasks [id]`	Generate phased task breakdown with `[P]` parallel markers
`rustyspec implement [id]`	Execute tasks with hook support and `--pass` for iterations
`rustyspec tests [id]`	Generate test scaffolds from Given/When/Then scenarios (`--framework`)
`rustyspec analyze [id]`	Validate consistency (read-only) with severity levels
`rustyspec review [id]`	Review spec quality with preflight heuristics and dimension scoring
`rustyspec checklist [id]`	Generate/append quality checklists (`--append`)
`rustyspec pipeline [id]`	Run multi-agent SDD pipeline (`--new`, `--from`, `--to`, `--auto`, `--no-agent`)
`rustyspec preset <cmd>`	Manage presets (`add`, `remove`, `list`, `search`, `info`)
`rustyspec extension <cmd>`	Manage extensions (`add`, `remove`, `enable`, `disable`, `list`)
`rustyspec upgrade`	Refresh templates + agent commands after update
`rustyspec completions <shell>`	Generate shell completions (bash, zsh, fish, powershell)
`rustyspec check`	Verify system prerequisites

Feature ID is auto-detected from git branch or latest spec if omitted.

Supported AI Agents (20)

Agent	Directory	Format
Claude Code	`.claude/commands/`	Markdown
Mistral Vibe	`.vibe/skills/`	Markdown (directory-based)
GitHub Copilot	`.github/agents/`	Markdown + `.prompt.md`
Gemini CLI	`.gemini/commands/`	TOML
Cursor	`.cursor/commands/`	Markdown
Windsurf	`.windsurf/workflows/`	Markdown
Codex CLI	`.codex/prompts/`	Markdown
Kiro CLI	`.kiro/prompts/`	Markdown
Kimi Code	`.kimi/skills/`	Markdown (directory-based)
Tabnine CLI	`.tabnine/agent/commands/`	TOML
Qwen Code	`.qwen/commands/`	Markdown
opencode	`.opencode/command/`	Markdown
Kilo Code	`.kilocode/workflows/`	Markdown
Auggie CLI	`.augment/commands/`	Markdown
Roo Code	`.roo/commands/`	Markdown
CodeBuddy	`.codebuddy/commands/`	Markdown
Qoder CLI	`.qoder/commands/`	Markdown
Amp	`.agents/commands/`	Markdown
SHAI	`.shai/commands/`	Markdown
IBM Bob	`.bob/commands/`	Markdown

Configuration

`rustyspec.toml`

[project]
name = "my_project"
version = "0.1.0"

[ai]
default_agent = "claude"

[git]
auto_branch = true
auto_commit = true

Environment Variables

Variable	Description
`RUSTYSPEC_AI`	Override default AI agent
`RUSTYSPEC_FEATURE`	Override feature detection (skip git/scan)
`GH_TOKEN`	GitHub API authentication

Development

# Run all 278 tests
cargo test

# Build release binary
cargo build --release

# Generate shell completions
rustyspec completions bash > ~/.bash_completion.d/rustyspec
rustyspec completions zsh > ~/.zfunc/_rustyspec
rustyspec completions fish > ~/.config/fish/completions/rustyspec.fish

Architecture

src/
  cli/          17 command handlers (clap derive)
  core/         Spec parser, planner, task generator, test generator, pipeline, analyzer, constitution
  agents/       20-agent config table, detection, format translation, registration, CLI invoker
  templates/    Tera rendering + 4-layer resolver
  presets/      Manifest validation, registry, manager
  extensions/   Manifest, registry, hooks, manager
  config/       TOML configuration handling

License

MIT

Name		Name	Last commit message	Last commit date
Latest commit History 12 Commits
.github		.github
docs		docs
scripts		scripts
src		src
templates		templates
.gitignore		.gitignore
Cargo.lock		Cargo.lock
Cargo.toml		Cargo.toml
LICENSE		LICENSE
README.md		README.md

Folders and files

Latest commit

History

Repository files navigation

The Problem

The 8-Step Workflow

Install

Build from source

Add to PATH — Linux / macOS

Add to PATH — Windows

Quick Start (5 minutes)

1. Initialize your project

2. Describe your feature

3. Plan the architecture

4. Generate tasks

5. Let your AI agent build it

Using with Claude Code

Setup

Available slash commands

Step-by-step with Claude Code

Using with Mistral Vibe

Setup

Step-by-step with Mistral Vibe

Using with GitHub Copilot

Setup

How it works

Step-by-step with Copilot

Using Multiple Agents Together

Automated multi-agent pipeline

Use Cases

Use Case 1: New project from scratch

Step 1 — Create and initialize the project

Step 2 — Specify your first feature

Step 3 — Plan and generate tasks

Step 4 — Build with your AI agent

Step 5 — Add the next feature

Use Case 2: Adding RustySpec to an existing project

Step 1 — Initialize RustySpec in your existing repo

Step 2 — Edit the constitution for your project

Step 3 — Specify the new feature

Step 4 — Plan with awareness of existing code

Step 5 — Generate and execute tasks

Step 6 — Continue with more features

Key differences between new and existing projects

Multi-Agent Pipeline

How it works

Execution modes

Supported agent CLI invocations

Real-world example

Spec-to-Test Generation

Generated Artifacts

Project Constitution

Template System

All Commands

Supported AI Agents (20)

Configuration

rustyspec.toml

Environment Variables

Development

Architecture

License

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