create-spec

create-spec is a skill for Claude Code from sequenzia/agent-alchemy. It costs 43 tokens per session (6,092 once invoked), scanned A, original, MIT.

A guided workflow for creating a new software specification through an adaptive interview.

In plain words
What is it for?
Use it to gather product and technical decisions and produce a specification for a software project.
Why use it?
It helps turn an initial idea into clear requirements and a structured document.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: names the AskUserQuestion tool; mentions Claude Code.

Runs only inside its plugin — its command needs a path that Claude Code sets for a plugin’s own hooks and for nothing else. Install the plugin, not this.

Part of the agent-alchemy-sdd-tools plugin — 5 skills, 6 agents shipped together

Good fit Use it to gather product and technical decisions and produce a specification for a software project.

Compare 6 skills from other repositories ↓
Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code
/plugin marketplace add sequenzia/agent-alchemy
Claude Code
/plugin install agent-alchemy-sdd-tools

Made for: Claude Code.

Or install agent-alchemy-sdd-tools, the plugin that ships this one along with the rest of its 5 skills, 6 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 create-spec

README.md
[![agentmods](https://agentmods.dev/badge/skills/sequenzia/agent-alchemy/create-spec.svg)](https://agentmods.dev/skills/sequenzia/agent-alchemy/create-spec)
Your own site
<a href="https://agentmods.dev/skills/sequenzia/agent-alchemy/create-spec"><img src="https://agentmods.dev/badge/skills/sequenzia/agent-alchemy/create-spec.svg" alt="Measured on agentmods" height="20"></a>
Per session 43 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 6,092 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.
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 $0.00043 $0.06092
Opus 5 $0.00022 $0.03046
Sonnet 5 $0.00009 $0.01218
Haiku 4.5 $0.00004 $0.00609

Measured 4d ago against content hash 2be4528bd9e8, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

create-spec 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 4d 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/sdd-tools/skills/create-spec/SKILL.md · 743 lines

How it starts

The opening of the file, as written. The whole thing — 743 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Create Spec Skill

You are initiating the spec creation workflow. This process gathers requirements through an adaptive, multi-round interview and generates a comprehensive specification document.

Critical Rules

AskUserQuestion is MANDATORY

IMPORTANT: You MUST use the AskUserQuestion tool for ALL questions to the user. Never ask questions through regular text output.

  • Every interview round question → AskUserQuestion
  • Confirmation questions → AskUserQuestion
  • Yes/no consent questions → AskUserQuestion
  • Clarifying questions → AskUserQuestion

Text output should only be used for:

  • Summarizing what you've learned
  • Presenting information
  • Explaining context

If you need the user to make a choice or provide input, use AskUserQuestion.

NEVER do this (asking via text output):

What features are most important to you?
1. Performance
2. Usability
3. Security

ALWAYS do this (using AskUserQuestion tool):

AskUserQuestion:
  questions:
    - header: "Priority"
      question: "What features are most important to you?"
      options:
        - label: "Performance"
          description: "Speed and responsiveness"
        - label: "Usability"
          description: "Ease of use"
        - label: "Security"
          description: "Data protection"
      multiSelect: true

Plan Mode Behavior

CRITICAL: This skill generates a spec document, NOT an implementation plan. When invoked during Claude Code's plan mode:

  • DO NOT create an implementation plan for how to build the spec's described features
  • DO NOT defer spec generation to an "execution phase"
  • DO proceed with the full interview and spec generation workflow immediately
  • DO write the spec file to the output path as normal

The spec is a planning artifact itself — generating it IS the planning activity.

Load Reference Skills

When codebase exploration is triggered (Phase 2, "new feature" type), load the teams reference for the Parallel Specialists exploration pattern:

Read the full file on GitHub · 743 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. 4d ago First seen · 743 lines · 43 tokens per session scan A 2be4528bd9e8

Subscribe to this mod's changes

create-spec is a skill published in the GitHub repository sequenzia/agent-alchemy (44 stars, last pushed 3mo ago), licensed MIT. It adds 43 tokens to every session and 6,092 once invoked, about $0.0002 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 2026-09-03.

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