spec-driven

spec-driven is a skill for Claude Code from NikiforovAll/claude-code-rules. It costs 44 tokens per session (1,106 once invoked), scanned A, original, Apache-2.0.

A workflow for building software from written specifications: requirements, design, tasks, and implementation. It uses approval gates between phases and assigns each phase to a separate agent.

In plain words
What is it for?
Use it to turn a feature idea into approved requirements, a design, an implementation task list, and coordinated coding work.
Why use it?
It gives feature work a clear sequence and prevents planning phases from being skipped or implemented by the wrong agent.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: mentions subagents.

Part of the handbook-agent-spec-kit plugin — 1 skill, 4 agents shipped together

Good fit Use it to turn a feature idea into approved requirements, a design, an implementation task list, and coordinated coding work.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/nikiforovall/claude-code-rules/spec-driven
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.

Any agent
npx skills add NikiforovAll/claude-code-rules --skill spec-driven
Clone the repo
git clone --depth 1 https://github.com/NikiforovAll/claude-code-rules

Made for: Claude Code.

Or install handbook-agent-spec-kit, the plugin that ships this one along with the rest of its 1 skill, 4 agents.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for spec-driven

README.md
[![agentmods](https://agentmods.dev/badge/skills/nikiforovall/claude-code-rules/spec-driven/github.svg)](https://agentmods.dev/skills/nikiforovall/claude-code-rules/spec-driven)
Your own site
<a href="https://agentmods.dev/skills/nikiforovall/claude-code-rules/spec-driven"><img src="https://agentmods.dev/badge/skills/nikiforovall/claude-code-rules/spec-driven/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for spec-driven

Your own site · 80×15
<a href="https://agentmods.dev/skills/nikiforovall/claude-code-rules/spec-driven"><img src="https://agentmods.dev/badge/skills/nikiforovall/claude-code-rules/spec-driven.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 44 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,106 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
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 5.1 $0.00044 $0.01106
Opus 5.5 $0.00018 $0.00442
Sonnet 5.5 $0.00009 $0.00221
Haiku 4.5 $0.00004 $0.00111

Measured 1mo ago against content hash d3cad28eeea8, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

spec-driven 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 1mo 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.

plugins/handbook-agent-spec-kit/skills/spec-driven/SKILL.md · 122 lines

How it starts

The opening of the file, as written. The whole thing — 122 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Spec-Driven Development Workflow

You are an orchestrator for spec-driven development. Your ONLY job is to coordinate subagents - you MUST NEVER create documents or implement tasks yourself.

CRITICAL: Orchestrator-Only Rules

ALWAYS:

  • ✅ Launch the appropriate subagent for each phase
  • ✅ Wait for subagent completion before proceeding
  • ✅ Manage approval gates and user feedback
  • ✅ Coordinate workflow transitions

NEVER:

  • ❌ Create requirements.md, design.md, or tasks.md yourself
  • ❌ Implement tasks directly
  • ❌ Skip launching a subagent "to save time"
  • ❌ Write code or documentation yourself

If you find yourself about to create a file or write code, STOP and launch the appropriate subagent instead.

File Structure

All specs go in: specs/{feature_name}/

  • requirements.md - User stories with EARS acceptance criteria
  • design.md - Technical architecture and implementation guidance
  • tasks.md - Incremental coding tasks

Workflow Phases

Phase 1: Requirements

Goal: Transform feature idea into user stories with measurable acceptance criteria.

MANDATORY: You MUST launch requirements-agent - do NOT create requirements yourself.

Process:

  1. Launch requirements-agent with feature description
  2. Review generated requirements with user
  3. Approval Gate: "Do the requirements look good? If so, we can move on to the design."
  4. Iterate based on feedback until approved (re-launch agent with feedback)

Phase 2: Design

Goal: Create technical design addressing all requirements.

Prerequisites: Approved requirements.md

MANDATORY: You MUST launch tech-design-agent - do NOT create design yourself.

Process:

  1. Launch tech-design-agent with feature name and requirements
  2. Review generated design with user
  3. Approval Gate: "Does the design look good? If so, we can move on to the implementation plan."
  4. Iterate based on feedback until approved (re-launch agent with feedback)

Phase 3: Tasks

Goal: Convert design into actionable coding tasks.

Read the full file on GitHub · 122 lines

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. 1mo ago First seen · 122 lines · 44 tokens per session scan A d3cad28eeea8

Subscribe to this mod's changes

spec-driven is a skill published in the GitHub repository NikiforovAll/claude-code-rules (141 stars, last pushed 17d ago), licensed Apache-2.0. It adds 44 tokens to every session and 1,106 once invoked, about $0.0002 per session on Opus 5.5. 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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