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🚀 Spec-Kit: Antigravity Skills & Workflows

The Event Horizon of Software Quality. Adapted for Google Antigravity IDE from github/spec-kit. Version: 1.1.0


🌟 Overview

Welcome to the Antigravity Edition of Spec-Kit. This system is architected to empower your AI pair programmer (Antigravity) to drive the entire Software Development Life Cycle (SDLC) using two powerful mechanisms: Workflows and Skills.

🔄 Dual-Mode Intelligence

In this edition, Spec-Kit commands have been split into two interactive layers:

  1. Workflows (/command): High-level orchestrations that guide the agent through a series of logical steps. The easiest way to run a skill is by typing its corresponding workflow command.
  2. Skills (@speckit.name): Packaged agentic capabilities. Mentions of a skill give the agent immediate context and autonomous "know-how" to execute the specific toolset associated with that phase.

To understand the power of Skills in Antigravity, read the docs here: https://antigravity.google/docs/skills


🛠️ Installation

To enable these agent capabilities in your project:

  1. Add the folder: Drop the .agents/ folder into the root of your project workspace.
  2. That's it! Antigravity automatically detects the .agents/skills and .agents/workflows directories. It will instantly gain the ability to perform Spec-Driven Development.

💡 Compatibility Note: This toolkit is compatible with multiple AI coding agents. To use with Claude Code, rename the .agents folder to .claude. The skills and workflows will function identically.

Prerequisites (Optional)

Some skills and scripts reference a .specify/ directory for templates and project memory. If you want the full Spec-Kit experience (template-driven spec/plan creation), create this structure at repo root:

.specify/
├── templates/
│   ├── spec-template.md          # Template for /speckit.specify
│   ├── plan-template.md          # Template for /speckit.plan
│   ├── tasks-template.md         # Template for /speckit.tasks
│   └── agent-file-template.md    # Template for update-agent-context.sh
└── memory/
    └── constitution.md           # Project governance rules (/speckit.constitution)

Note: If .specify/ is absent, skills will still function — they'll create blank files instead of using templates. The constitution workflow (/speckit.constitution) will create this structure for you on first run.


🏗️ The Architecture

The toolkit is organized into modular components that provide both the logic (Scripts) and the structure (Templates) for the agent.

.agents/
├── skills/                        # @ Mentions (Agent Intelligence)
│   ├── nestjs-best-practices/     # NestJS Architecture Patterns
│   ├── next-best-practices/       # Next.js App Router Patterns
│   ├── speckit.analyze/           # Consistency Checker
│   ├── speckit.checker/           # Static Analysis Aggregator
│   ├── speckit.checklist/         # Requirements Validator
│   ├── speckit.clarify/           # Ambiguity Resolver
│   ├── speckit.constitution/      # Governance Manager
│   ├── speckit.diff/              # Artifact Comparator
│   ├── speckit.implement/         # Code Builder (Anti-Regression)
│   ├── speckit.migrate/           # Legacy Code Migrator
│   ├── speckit.plan/              # Technical Planner
│   ├── speckit.quizme/            # Logic Challenger (Red Team)
│   ├── speckit.reviewer/          # Code Reviewer
│   ├── speckit.security-audit/    # Security Auditor (OWASP/CASL/ClamAV)
│   ├── speckit.specify/           # Feature Definer
│   ├── speckit.status/            # Progress Dashboard
│   ├── speckit.tasks/             # Task Breaker
│   ├── speckit.taskstoissues/     # Issue Tracker Syncer (GitHub + Gitea)
│   ├── speckit.tester/            # Test Runner & Coverage
│   └── speckit.validate/          # Implementation Validator
│
├── workflows/                     # / Slash Commands (Orchestration)
│   ├── 00-speckit.all.md          # Full Pipeline (10 steps: Specify → Validate)
│   ├── 0111-speckit.*.md         # Individual phase workflows
│   ├── speckit.prepare.md         # Prep Pipeline (5 steps: Specify → Analyze)
│   ├── schema-change.md           # DB Schema Change (ADR-009)
│   ├── create-backend-module.md   # NestJS Module Scaffolding
│   ├── create-frontend-page.md    # Next.js Page Scaffolding
│   ├── deploy.md                  # Deployment via Gitea CI/CD
│   └── util-speckit.*.md          # Utilities (checklist, diff, migrate, etc.)
│
└── scripts/
    ├── bash/                      # Bash Core (Kinetic logic)
    │   ├── common.sh              # Shared utilities & path resolution
    │   ├── check-prerequisites.sh # Prerequisite validation
    │   ├── create-new-feature.sh  # Feature branch creation
    │   ├── setup-plan.sh          # Plan template setup
    │   ├── update-agent-context.sh # Agent file updater (main)
    │   ├── plan-parser.sh         # Plan data extraction (module)
    │   ├── content-generator.sh   # Language-specific templates (module)
    │   └── agent-registry.sh      # 17-agent type registry (module)
    ├── powershell/                 # PowerShell Equivalents (Windows-native)
    │   ├── common.ps1             # Shared utilities & prerequisites
    │   └── create-new-feature.ps1 # Feature branch creation
    ├── fix_links.py               # Spec link fixer
    ├── verify_links.py            # Spec link verifier
    └── start-mcp.js               # MCP server launcher

🗺️ Mapping: Commands to Capabilities

Phase Workflow Trigger Antigravity Skill Role
Full Pipeline /00-speckit.all N/A Runs full SDLC pipeline (10 steps: Specify → Validate).
Governance /01-speckit.constitution @speckit.constitution Establishes project rules & principles.
Definition /02-speckit.specify @speckit.specify Drafts structured spec.md.
Ambiguity /03-speckit.clarify @speckit.clarify Resolves gaps post-spec.
Architecture /04-speckit.plan @speckit.plan Generates technical plan.md.
Decomposition /05-speckit.tasks @speckit.tasks Breaks plans into atomic tasks.
Consistency /06-speckit.analyze @speckit.analyze Cross-checks Spec vs Plan vs Tasks.
Execution /07-speckit.implement @speckit.implement Builds implementation with safety protocols.
Quality /08-speckit.checker @speckit.checker Runs static analysis (Linting, Security, Types).
Testing /09-speckit.tester @speckit.tester Runs test suite & reports coverage.
Review /10-speckit.reviewer @speckit.reviewer Performs code review (Logic, Perf, Style).
Validation /11-speckit.validate @speckit.validate Verifies implementation matches Spec requirements.
Preparation /speckit.prepare N/A Runs Specify → Analyze prep sequence (5 steps).
Schema /schema-change N/A DB schema changes per ADR-009 (no migrations).
Security N/A @speckit.security-audit OWASP Top 10 + CASL + ClamAV audit.
Checklist /util-speckit.checklist @speckit.checklist Generates feature checklists.
Diff /util-speckit.diff @speckit.diff Compares artifact versions.
Migration /util-speckit.migrate @speckit.migrate Port existing code to Spec-Kit.
Red Team /util-speckit.quizme @speckit.quizme Challenges logical flaws.
Status /util-speckit.status @speckit.status Shows feature completion status.
Tracking /util-speckit.taskstoissues @speckit.taskstoissues Syncs tasks to GitHub/Gitea issues.

🛡️ The Quality Assurance Pipeline

The following skills are designed to work together as a comprehensive defense against regression and poor quality. Run them in this order:

Step Skill Core Question Focus
1. Checker @speckit.checker "Is the code compliant?" Syntax & Security. Runs compilation, linting (ESLint/GolangCI), and vulnerability scans (npm audit/govulncheck). Catches low-level errors first.
2. Tester @speckit.tester "Does it work?" Functionality. Executes your test suite (Jest/Pytest/Go Test) to ensure logic performs as expected and tests pass.
3. Reviewer @speckit.reviewer "Is the code written well?" Quality & Maintainability. Analyzes code structure for complexity, performance bottlenecks, and best practices, acting as a senior peer reviewer.
4. Validate @speckit.validate "Did we build the right thing?" Requirements. Semantically compares the implementation against the defined spec.md and plan.md to ensure all feature requirements are met.

🤖 Power User Tip: You can amplify this pipeline by creating a custom MCP Server or subagent that delegates heavy reasoning to a dedicated LLM.

  • Use Case: Bind the @speckit.validate and @speckit.reviewer steps to a large-context model.
  • Benefit: Large-context models (1M+ tokens) excel at analyzing the full project context against the Spec, finding subtle logical flaws that smaller models miss.
  • How: Create a wrapper script scripts/gemini-reviewer.sh that pipes the tasks.md and codebase to an LLM, then expose this as a tool.

🏗️ The Design & Management Pipeline

These workflows function as the "Control Plane" of the project, managing everything from idea inception to status tracking.

Step Workflow Core Question Focus
1. Preparation /speckit.prepare "Are we ready?" The Macro-Workflow. Runs Skills 0206 (Specify \to Clarify \to Plan \to Tasks \to Analyze) in one sequence to go from "Idea" to "Ready to Code".
2. Migration /util-speckit.migrate "Can we import?" Onboarding. Reverse-engineers existing code into spec.md, plan.md, and tasks.md.
3. Red Team /util-speckit.quizme "What did we miss?" Hardening. Socratic questioning to find logical gaps in your specification before you plan.
4. Export /util-speckit.taskstoissues "Who does what?" Handoff. Converts your tasks.md into GitHub or Gitea issues with labels and milestones.
5. Status /util-speckit.status "Are we there yet?" Tracking. Scans all artifacts to report feature completion percentage.
6. Utilities /util-speckit.diff
/util-speckit.checklist
"What changed?" Support. View artifact diffs or generate quick acceptance checklists.

🔄 The Design Sequence

Stage 1: Inception

  • Legacy Project? \to Run /util-speckit.migrate.
  • New Feature? \to Run /speckit.prepare.

Stage 2: Hardening

  • Run /util-speckit.quizme to catch edge cases.
  • Run /speckit.prepare again to regenerate the Plan based on restricted specs.

Stage 3: Handoff

  • Run /util-speckit.taskstoissues to sync with your board.

🚀 Getting Started in Antigravity

Once the .agents folder is present, you can talk to your agent as a partner. You can trigger a full process using a slash command or reference a specific capability using a skill mention.

Example Conversation:

Developer: "/02-speckit.specify Add a real-time notification system using WebSockets."

Antigravity: "Understood. Executing the @speckit.specify skill. Creating feature branch 005-notifications and drafting the initial specification..." (Antigravity creates branch, drafts spec.md)

Antigravity: "Specification ready. I've identified some ambiguity in the reconnection strategy. Should I use @speckit.clarify to resolve this?"

Developer: "Yes, use @speckit.clarify." (Antigravity executes the skill logic, interviewing the developer and updating the spec)

Antigravity: "The spec is now robust. I'm ready to trigger /04-speckit.plan and /05-speckit.tasks to prepare for implementation."


🏆 Best Practices for Antigravity

To get the most out of this system, follow these Spec-Driven Development (SDD) rules:

1. The Constitution is King 👑

Never skip /01-speckit.constitution.

  • This file is the "Context Window Anchor" for the AI.
  • It prevents hallucinations about tech stack (e.g., "Don't use jQuery" or "Always use TypeScript strict mode").
  • Tip: If Antigravity makes a style mistake, don't just fix the code—update the Constitution so it never happens again.

2. The Layered Defense 🛡️

Don't rush to code. The workflow exists to catch errors cheaply before they become expensive bugs.

  • Ambiguity Layer: /03-speckit.clarify catches misunderstandings.
  • Logic Layer: /util-speckit.quizme catches edge cases.
  • Consistency Layer: /06-speckit.analyze catches gaps between Spec and Plan.

3. The 15-Minute Rule ⏱️

When generating tasks.md (Skill 05), ensure tasks are atomic.

  • Bad Task: "Implement User Auth" (Too big, AI will get lost).
  • Good Task: "Create User Mongoose schema with email validation" (Perfect).
  • Rule of Thumb: If a task takes Antigravity more than 3 tool calls to finish, it's too big. Break it down.

4. "Refine, Don't Rewind"

If you change your mind mid-project:

  1. Don't just edit the code.
  2. Edit the spec.md to reflect the new requirement.
  3. Run /util-speckit.diff to see the drift.
  4. This keeps your documentation alive and truthful.

🧩 Adaptation Notes

  • Skill-Based Autonomy: Mentions like @speckit.plan trigger the agent's internalized understanding of how to perform that role.
  • Shared Script Core: Logic resides in .agents/scripts/bash (modular) with PowerShell equivalents in scripts/powershell/ for Windows-native execution.
  • Agent-Native: Designed to be invoked via Antigravity tool calls and reasoning rather than just terminal strings.
  • LCBP3-DMS Specific: Includes project-specific skills (nestjs-best-practices, next-best-practices, speckit.security-audit) and workflows (/schema-change, /create-backend-module, /deploy).

Built with logic from Spec-Kit. Powered by Antigravity.