speckit

A specification-driven development workflow, meaning software work starts with written requirements before planning and implementation.

In plain words
What is it for?
Use it to write or update feature specifications, ask clarification questions, create implementation plans, validate documents, and carry out planned tasks.
Why use it?
It helps find unclear requirements, keep design documents consistent, and track implementation against an agreed specification.

Skill for Claude CodeCodex

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/re-cinq/wave/speckit
Any agent
npx skills add re-cinq/wave --skill speckit
Clone the repo
git clone --depth 1 https://github.com/re-cinq/wave

Made for: Claude Code, Codex.

Per session 23 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 627 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 $0.00023 $0.00627
Opus 5 $0.00012 $0.00313
Sonnet 5 $0.00005 $0.00125
Haiku 4.5 $0.00002 $0.00063

Measured 2d ago against content hash d28780a2f2cf, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

speckit 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 2d 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.

.claude/skills/speckit/SKILL.md · 77 lines

How it starts

The opening of the file, as written. The whole thing — 77 lines — stays where its author put it; the contents beside it link to each section on GitHub.

SpecKit - Specification-Driven Development Tools

SpecKit provides a comprehensive workflow for specification-driven development, from initial feature description to implementation planning.

Overview

SpecKit follows a structured workflow:

  1. Specify - Create feature specifications from natural language
  2. Clarify - Identify and resolve underspecified areas
  3. Plan - Generate implementation plans and design artifacts
  4. Validate - Analyze specifications for consistency and quality
  5. Implement - Execute implementation plans with task tracking

Available Commands

Core Workflow

Command Purpose Usage
speckit.specify Create or update feature specification /speckit.specify "feature description"
speckit.clarify Identify underspecified areas and ask clarification questions /speckit.clarify
speckit.plan Generate implementation plans and design artifacts /speckit.plan
speckit.implement Execute implementation plan with task tracking /speckit.implement

Analysis & Validation

Command Purpose Usage
speckit.analyze Cross-artifact consistency and quality analysis /speckit.analyze
speckit.tasks Generate actionable, dependency-ordered task list /speckit.tasks
speckit.checklist Generate custom validation checklist /speckit.checklist

Project Setup

Command Purpose Usage
speckit.constitution Create or update project constitution and principles /speckit.constitution

Standard Feature Development

/speckit.specify "Add user authentication system"
/speckit.clarify     # if needed
/speckit.plan
/speckit.tasks
/speckit.implement

File Structure

specs/
├── [number]-[feature-name]/
│   ├── spec.md              # Main specification
│   ├── plan.md              # Implementation plan
│   ├── tasks.md             # Task breakdown
│   └── checklists/
│       └── custom.md        # Custom validation checklist
└── constitution.md          # Project constitution

Read the full file on GitHub · 77 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. 2d ago First seen · 77 lines · 23 tokens per session scan A d28780a2f2cf

Subscribe to this mod's changes

speckit is a skill published in the GitHub repository re-cinq/wave (20 stars, last pushed 4mo ago), licensed MIT. It adds 23 tokens to every session and 627 once invoked, about $0.0001 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.

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